Find flights
Deals
Insights
When to book
FAQs & Tips
Direct Flights
Airlines

STL - DEN

$34 Find cheap flights from St. Louis to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Denver departing on 6/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Thu 6/27
Thu 7/4

Search hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Denver, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Denver, as well as popular online travel agencies
In the last 7 days travelers have searched 42,816,550 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from St. Louis to Denver (STL-DEN)

 
These are the cheapest deals for flights from St. Louis to Denver currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from St. Louis to Denver

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to Denver.

Recent one-way flight deals from St. Louis to Denver

Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Denver found on KAYAK recently.

Recent last minute flight deals from St. Louis to Denver

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from St. Louis to Denver.

Recent direct flight deals from St. Louis to Denver

The latest deals for direct flights from St. Louis to Denver so you can sit back and relax without the need for a layover.

Cheap bus & train deals from St. Louis to Denver

Find recent round-trip train or bus tickets from St. Louis to Denver.

All round-trip flight deals to Denver

The cheapest plane tickets to Denver found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
8:00 pm - 9:28 pmSTL-DEN
2h 28mnonstop
6:26 am - 9:37 amDEN-STL
2h 11mnonstop
$58Frontier
Find Deal
Sat, Sep 21 - Wed, Sep 25
8:02 pm - 9:32 pmSTL-DEN
2h 30mnonstop
6:20 am - 9:29 amDEN-STL
2h 09mnonstop
$61Frontier
Find Deal
Wed, Jun 12 - Wed, Jun 19
3:47 pm - 5:16 pmSTL-DEN
2h 29mnonstop
11:18 am - 8:01 pmDEN-STL
7h 43m1 stop
Tue, Jun 18 - Sat, Jun 22
4:45 pm - 6:12 pmSTL-DEN
2h 27mnonstop
7:02 pm - 10:11 pmDEN-STL
2h 09mnonstop
$187United Airlines
Find Deal
Tue, Jun 25 - Tue, Jul 2
6:10 pm - 9:56 amSTL-DEN
16h 46m1 stop
11:39 am - 2:47 pmDEN-STL
2h 08mnonstop
Fri, Jun 7 - Tue, Jun 11
9:09 am - 3:36 pmSTL-DEN
7h 27m1 stop
11:59 pm - 8:11 amDEN-STL
7h 12m1 stop
$195American Airlines
Find Deal
Wed, Aug 14 - Sat, Aug 17
5:27 pm - 10:37 pmSTL-DEN
6h 10m1 stop
12:55 am - 9:03 amDEN-STL
7h 08m1 stop
$196Delta
Find Deal
Sat, Jul 13 - Fri, Jul 19
1:42 pm - 3:09 pmSTL-DEN
2h 27mnonstop
7:24 pm - 10:33 pmDEN-STL
2h 09mnonstop
$197United Airlines
Find Deal
Wed, Jun 26 - Wed, Jul 3
8:01 am - 1:55 pmSTL-DEN
6h 54m1 stop
11:59 pm - 8:33 amDEN-STL
7h 34m1 stop
$215American Airlines
Find Deal
Tue, Jun 18 - Wed, Jun 19
6:30 pm - 10:54 pmSTL-DEN
5h 24m1 stop
12:35 am - 9:14 amDEN-STL
7h 39m1 stop
$216Delta
Find Deal
Tue, Aug 6 - Mon, Aug 12
10:44 pm - 12:20 amSTL-DEN
2h 36mnonstop
$34Frontier
Find Deal
Tue, Jun 4
8:02 pm - 9:25 pmSTL-DEN
2h 23mnonstop
$39Frontier
Find Deal
Wed, Jul 17
3:47 pm - 5:09 pmSTL-DEN
2h 22mnonstop
$40Frontier
Find Deal
Tue, Jul 16
5:30 pm - 10:52 pmSTL-DEN
6h 22m1 stop
$94United Airlines
Find Deal
Sat, Jul 27
2:35 pm - 6:49 pmSTL-DEN
5h 14m1 stop
$98Delta
Find Deal
Wed, Jul 17
5:27 am - 9:50 amSTL-DEN
5h 23m1 stop
$99American Airlines
Find Deal
Wed, Jun 26
5:27 am - 9:50 amSTL-DEN
5h 23m1 stop
$108American Airlines
Find Deal
Wed, Jun 26
1:42 pm - 3:09 pmSTL-DEN
2h 27mnonstop
$109United Airlines
Find Deal
Wed, Jun 26
7:55 am - 3:36 pmSTL-DEN
8h 41m1 stop
$128Delta
Find Deal
Tue, Jun 11
7:30 am - 12:07 pmSTL-DEN
5h 37m1 stop
$130Sun Country Air
Find Deal
Sun, Aug 25
11:22 pm - 12:49 amSTL-DEN
2h 27mnonstop
6:20 am - 9:29 amDEN-STL
2h 09mnonstop
$133Frontier
Find Deal
Sun, Jun 2 - Wed, Jun 5
8:04 pm - 9:35 pmSTL-DEN
2h 31mnonstop
10:00 am - 1:09 pmDEN-STL
2h 09mnonstop
$168Frontier
Find Deal
Sat, Jun 1 - Tue, Jun 4
11:22 pm - 12:49 amSTL-DEN
2h 27mnonstop
6:20 am - 9:29 amDEN-STL
2h 09mnonstop
$178Frontier
Find Deal
Sun, Jun 2 - Wed, Jun 5
11:22 pm - 12:49 amSTL-DEN
2h 27mnonstop
10:11 am - 5:11 pmDEN-STL
6h 00m1 stop
Sun, Jun 2 - Sun, Jun 9
5:01 pm - 12:24 amSTL-DEN
8h 23m1 stop
9:58 am - 5:11 pmDEN-STL
6h 13m1 stop
Sun, Jun 2 - Fri, Jun 7
8:05 am - 12:25 pmSTL-DEN
5h 20m1 stop
1:25 pm - 4:29 pmDEN-STL
2h 04mnonstop
$552United Airlines
Find Deal
Wed, May 29 - Wed, Jun 5
5:31 pm - 9:54 pmSTL-DEN
5h 23m1 stop
9:40 am - 12:46 pmDEN-STL
2h 06mnonstop
$562United Airlines
Find Deal
Wed, May 29 - Fri, Jun 7
4:20 pm - 11:06 pmSTL-DEN
7h 46m1 stop
11:59 pm - 9:53 amDEN-STL
8h 54m1 stop
$635American Airlines
Find Deal
Thu, May 30 - Sat, Jun 1
4:20 pm - 11:06 pmSTL-DEN
7h 46m1 stop
7:35 am - 2:35 pmDEN-STL
6h 00m1 stop
$637American Airlines
Find Deal
Wed, May 29 - Sun, Jun 2
6:30 am - 1:56 pmSTL-DEN
8h 26m1 stop
6:10 pm - 12:56 amDEN-STL
5h 46m1 stop
$696Delta
Find Deal
Wed, May 29 - Tue, Jun 4
3:32 pm - 5:01 pmSTL-DEN
2h 29mnonstop
11:24 am - 2:32 pmDEN-STL
2h 08mnonstop
$58Frontier
Find Deal
Thu, Jun 6 - Thu, Jun 13
3:32 pm - 5:01 pmSTL-DEN
2h 29mnonstop
6:20 am - 9:29 amDEN-STL
2h 09mnonstop
$59Frontier
Find Deal
Thu, Jun 6 - Mon, Jun 10
8:02 pm - 9:32 pmSTL-DEN
2h 30mnonstop
6:20 am - 9:29 amDEN-STL
2h 09mnonstop
$61Frontier
Find Deal
Wed, Jun 12 - Wed, Jun 19
8:02 pm - 9:32 pmSTL-DEN
2h 30mnonstop
11:39 am - 2:47 pmDEN-STL
2h 08mnonstop
$66Frontier
Find Deal
Wed, Jun 12 - Tue, Jun 18
8:04 pm - 9:35 pmSTL-DEN
2h 31mnonstop
11:24 am - 2:32 pmDEN-STL
2h 08mnonstop
$68Frontier
Find Deal
Mon, Jun 3 - Thu, Jun 6
8:02 pm - 9:25 pmSTL-DEN
2h 23mnonstop
6:15 am - 9:25 amDEN-STL
2h 10mnonstop
$71Frontier
Find Deal
Wed, Jul 17 - Sat, Jul 20
8:22 pm - 9:52 pmSTL-DEN
2h 30mnonstop
11:39 am - 2:47 pmDEN-STL
2h 08mnonstop
$76Frontier
Find Deal
Mon, Jun 10 - Tue, Jun 11
10:59 pm - 12:26 amSTL-DEN
2h 27mnonstop
6:15 am - 9:25 amDEN-STL
2h 10mnonstop
$78Frontier
Find Deal
Tue, Aug 6 - Wed, Aug 7
1:42 pm - 3:09 pmSTL-DEN
2h 27mnonstop
7:24 pm - 10:33 pmDEN-STL
2h 09mnonstop
$197United Airlines
Find Deal
Wed, Jun 26 - Wed, Jul 3
9:08 am - 10:35 amSTL-DEN
2h 27mnonstop
7:02 pm - 10:11 pmDEN-STL
2h 09mnonstop
$237United Airlines
Find Deal
Wed, Aug 7 - Wed, Aug 7

Flights from St. Louis to Denver - Travel Insights & Trends

Get data-powered insights and trends into flights from St. Louis to Denver to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Denver?

The average price of all flights from St. Louis to Denver clicked on KAYAK for each day over the last 12 months.
When flying from St. Louis to Denver, you should consider leaving on a Tuesday and avoid Sundays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Wednesdays and the most expensive ones on Mondays.

What is the cheapest month to fly from St. Louis to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from St. Louis to Denver is October, where tickets cost $115 on average. On the other hand, the most expensive months are December and July, where the average cost of tickets is $193 and $178 respectively.

How far in advance should I book a flight from St. Louis to Denver?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from St. Louis to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from St. Louis to Denver, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 27 days before departure.

Which airlines provide the cheapest flights from St. Louis to Denver?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the cheapest one-way ticket from St. Louis to Denver found on KAYAK was with Frontier for $34. Frontier proposed a round-trip connection from $58 and United Airlines from $187.

Which airlines fly most frequently between St. Louis and Denver?

Southwest connects St. Louis to Denver up to 7 flights per day, followed by United Airlines (3 flights per day), and Frontier (one flight per day).

Which airlines fly non-stop between St. Louis and Denver?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from St. Louis to Denver.
There are 3 airlines that fly nonstop from St. Louis to Denver. They are: Frontier, Southwest and United Airlines. The cheapest price of all airlines flying this route was found with Frontier at $39 for a one-way flight. On average, the best prices for this route can be found at Frontier.

How many flights are there between St. Louis and Denver per day?

Each day, there are between 10 and 13 nonstop flights that take off from St. Louis and land in Denver, with an average flight time of 2h 20m. The most common departure time is 4:00 pm and most flights take off in the afternoon. Each week, there are 87 flights. The most frequent day of departure is Wednesday, when 15% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between St. Louis and Denver?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from St. Louis to Denver take?

The duration of a nonstop flight to Denver from St. Louis is typically 2h 18m. The journey crosses a distance of 767 miles.

What’s the earliest departure time from St. Louis to Denver?

Early birds can take the earliest flight from St. Louis at 5:15 am and will be landing in Denver at 6:35 am.

What’s the latest departure time from St. Louis to Denver?

If you prefer to fly at night, the latest flight from St. Louis to Denver jets off at 10:45 pm and lands at 12:05 am.

Good to know

Low season

January

High season

July

Cheapest flight

$34
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 18% increase in price.
Flight from St. Louis to Denver

When to book flights from St. Louis to Denver

Are your dates flexible? Find out the best times to travel from St. Louis to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Denver

  • How can I fly from STL to DEN?

    Frontier and United operate several nonstop flights from STL to DEN that depart throughout the day. American and United operate several flights per day that have one stop. The layover for these flights is often in cities such as Chicago (ORD), Charlotte (CLT), and Dallas (DFW).

  • Does STL have a USO lounge?

    STL provides a USO lounge for active military service members and their families. The James S. McDonnell USO, located in Terminal 1 on the lower level opposite M6 baggage claim, is open 24h a day, 7 days a week, 365 days a year. All services and amenities at the USO are without charge. Some of these offerings include beverages, snacks, Wi-Fi, a DSN phone, laptops, and computers. You can also relax by watching cable TV, watching a DVD or a Blu-ray disc, or playing Xbox 360. The USO also has a seating area, a quiet area where you can sleep, a nursery, and toiletries.

  • Does STL have designated lactation areas for nursing mothers who might prefer some privacy?

    STL provides dedicated private spaces to mothers who want to nurse or breast pump in clean privacy. These lactation suites are located past security at Gates A10, C9, and E33. Each calm, clean room has power outlets for a breast pump, a sink, and a full back comfortable chair with a movable arm table. There is also an Ottoman and a bench so that additional people, such as baby’s siblings, can join mama in the space, with enough room for luggage.

  • How do I get into downtown Denver from the DEN airport?

    You can take the A Line of the RTD bus that runs to the center of Denver. Also, you can take a train that departs from DEN 4 to 6 times an hour. Public transportation from DEN is very convenient to get you into downtown Denver.

  • What is the cheapest flight from St. Louis to Denver?

    In the last 3 days, the lowest price for a flight from St. Louis to Denver was $34 for a one-way ticket and $58 for a round-trip.

  • Do I need a passport to fly between St. Louis and Denver?

    A passport is not required to fly from St. Louis to Denver.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to Denver?

    American Airlines, Alaska Airlines, Delta, and PSA Airlines offer inflight Wi-Fi service on the St. Louis to Denver flight route.

  • Which aircraft models fly most regularly from St. Louis to Denver?

    The Airbus A319 is the aircraft model that flies most regularly on the St. Louis to Denver flight route.

  • Which airline alliances offer flights from St. Louis to Denver?

    Star Alliance is the only airline alliance operating flights between St. Louis and Denver.

  • On which days can I fly direct from St. Louis to Denver?

    There are nonstop flights from St. Louis to Denver on a daily basis.

  • Which is the best airline for flights from St. Louis to Denver, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Denver are Delta and United Airlines. With an average price for the route of $259 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $298 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from St. Louis to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and DEN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from St. Louis to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $113 or less one-way and $158 or less round-trip.
  • When you arrive at the Denver International Airport (DEN), you can ease the stiffness out of your muscles by getting a massage at the spa, The Massage, at the B concourse on the mezzanine level. Or you could try the Colorado Oasis or Xpres spas at DEN.
  • If when you arrive at DEN you need to pick up some necessities you couldn’t pack due to airline restrictions, stop at the Peak News and Gifts to get the toiletries and essentials you need before heading into Denver.
  • As part of the Lambert Art and Culture Program at the Lambert St. Louis International Airport (STL), the airport has installed a piano permanently in Terminal 1, so travelers are treated to live music as they make their way to their plane.
  • DEN is happy to provide service animals and pets with relief areas in all three terminals, in the middle of all the gates. For A, B, and C terminals, the pet relief areas are near the US mail drop areas. If you are in Jeppesen terminal, the pet relief area is on the northwest side of the second level.
  • If you want to park your car at STL before you head off to Denver, long-term parking lots are available in lots B and D for an affordable price, and payment is usually due at the time you exit the lot. Free shuttles that run every 10min can take you to your terminal.
See more tips

Prefer to fly non-stop from St. Louis to Denver?

Find which airlines fly direct from Lambert-St Louis to Denver Intl, which days they fly and book direct flights.

Nonstop departures

Lambert-St Louis to Denver Intl

Monday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Wednesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Thursday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Friday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

See more direct flights

Nonstop returns

Denver Intl to Lambert-St Louis

Monday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Wednesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Thursday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Friday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

See more direct flights
See more direct flights

Top 4 airlines serving from St. Louis to Denver

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10502 reviews
8.2Boarding
8.0Entertainment
8.6Crew
7.9Comfort
7.4Food
Airline reviews

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

10.0 ExcellentMichael, May 2024SJC - ATL
Read more about Delta reviews

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

Had to change aircraft due to a faulty door. Surprisingly it only caused about an hour and a half of delay. Delta handled this situation as well as can be expected.

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

Our flight to Zurich was delayed by almost 3 hours, so we missed our next flight. There was no indication it would be delayed this much. We were told the gate had changed and then it apparently took over 2 hours to load the "catering" on the plane. We were not compensated in any way for the trouble.

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

The Wi-Fi was unavailable on this flight for some reason.

This was a Lufthansa flight, not United. The CSA at the counter, Ashley, was not only incompetent, but quite rude. Me and two other PAX waited over 7 minutes standing in front of her and another CSA and they ignored us. We joked that we must have accidently taken invisibility pills. She could have at least said "I'll be with you in a moment, I'm currently....". I could go on about how rude she and the other CSAs were (whispering, not communicating with me, blaming the situation on others, etc.). She would not work for me. Then, she gave me literally the worst seat on the plane. the worst. My seat kept getting bumped (rammed twice by the crew with their carts and about every 5 minutes by someone using the bathroom), listening to the bathroom all night, crowded seat, etc.

We ended up with seats in the very back. So they did not recline. Have no idea why, we reserved and checked in very early. The isles were very narrow and the seats had very little leg room. But they did give us water, and a snack.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Positive: Entertainment via phone on the short was great and my first time. Good food and wine and head phones for free. Negative: Seat hardly reclined on the long flight. Breakfast was an egg with a bun. No egg choices and rather have something sweet like bun/jam and Youghurt.

They did get us booked on a later flight, but it made us miss our connecting flight. So, we had to stay and another state overnight with no luggage or clothes. Because they kept our luggage at airport for next flight on the next day.

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Crew is way too many times on the intercom re explaining the same thing

Amazing comfortable chairs great snacks super friendly staff pilots did excellent job. Smooth sailing all the way. Definitely be flying United more.

AA1537 the AC was not working properly. It was very hot and uncomfortable.

Worst experience flying American Airlines. I fly with them often, so I was super disappointed in the service I received at gate 30 in LGA on May 24, mid-day. The flight was delayed twice. I was patiently waiting in the American Airlines lounge when I received the notice on my app that the plane was boarding 45 minutes before its newly re-scheduled take off of 4 pm (from the orginal 1:45 pm then 3:00 pm). It took me 5 min to travel from the lounge to the gate and when I arrived there at 3:20 flight gate attendant told me the flight had closed and that they announced for passengers multiple times. I showed them the notification on my app and they were really rude and unempathetic. The person who rescheduled my flight at customer service wasn't any happier but was at least helpful in getting me on the next flight.

Flight was 1/2 hour delayed leaving Phoenix. Otherwise it was an average flight. Flight crew on this trip was very nice.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Was lucky to have a employee at the AA checkin counter that had compassion and understood they ordeal that we went through with our original flight being diverted, needing to stay in the aircraft and then flying to the original destination; adding hours to the trip and forcing us to miss our connection and our rebooked connection. She was able to get up on standby on the highest priority on the next flight to the closest airport we need to be at and it all worked out despite being many hours late.

Delayed so that missed connecting flight. Connecting flight was also delayed on the tarmac but they closed the gate before the rescheduled time.

Attendants were rude. Scowling. Seats were miserable and we paid extra.

Took off over an hour late with multiple mechanical issues. Gate agent in Dallas was lazy and was slow as molasses. Had a line 10 people long. Spirit bad..

The flight was short. However, my bag was delayed and was put on another flight.

Flight attendant was incredible. Very efficient, friendly and pleasant. Patricia was one of the best I have ever seen. Please give her a big raise!

Frontier won’t help you at the airport without paying $25. Carry on was $75. Then you get on the plain and every beverage or snack is also a charge. Seats are hard and real packed in. I would never fly them again.

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Plane could have been more on time. More leg room .

Didn't like anything!! Horrible flight. Small seating area and hard seats. Butt was sore after 2 hour flight to Seattle No entertainment or free refreshments No wifi or USB charging receptacles to charge phone entoute like other airliners Luggage rates were 3 times as much as competitors. Difficult to navigate online luggue process to pre pay before flight Overall bad experience WILL NEVER RIDE OR RECOMMEND FRONTIER TO FRIENDS OR FAMILY MEMBERS!!! THIS IS A SHAME!! MOST MESERIBLE FLIGHT OF MY LIFE!! AND I THOUGHT SPIRIT WAS 👎 YOU GOT THEM BEAD HANDS DOWN!!

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

Not have to pay for every single item to take a flight. Seating and delays sucked.

Terrible. Seats are bad and the baggage policy is inconsistent

Everything was good, and most importantly on time. They have been extremely tardy in some of my flights

They lost my baggage on my connection flight, it’s been 24 hours since I put my claim in and still no update on my bags.

It’s a cheap airline. I wish they had better seats.

Book cheap flights from St. Louis to Denver

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Denver found on KAYAK in the last 72 hours.
6/4Tue
nonstopFrontier
2h 36mSTL-DEN
$34
7/17Wed
nonstopFrontier
2h 23mSTL-DEN
$39
7/16Tue
nonstopFrontier
2h 22mSTL-DEN
$40
7/27Sat
1 stopUnited Airlines
6h 22mSTL-DEN
$94
7/17Wed
1 stopDelta
5h 14mSTL-DEN
$98
6/26Wed
1 stopAmerican Airlines
5h 23mSTL-DEN
$99
6/26Wed
1 stopAmerican Airlines
5h 23mSTL-DEN
$108
6/26Wed
nonstopUnited Airlines
2h 27mSTL-DEN
$109
6/11Tue
1 stopDelta
8h 41mSTL-DEN
$128
8/25Sun
1 stopSun Country Air
5h 37mSTL-DEN
$130

Search by stops

Search by airline

Search by price

Last minute flights from St. Louis to Denver

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Denver that are departing in the next 10 days.
6/2Sun
nonstopFrontier
2h 27mSTL-DEN
6/5Wed
nonstopFrontier
2h 09mDEN-STL
$133
6/1Sat
nonstopFrontier
2h 31mSTL-DEN
6/4Tue
nonstopFrontier
2h 09mDEN-STL
$168
6/2Sun
nonstopFrontier
2h 27mSTL-DEN
6/5Wed
nonstopFrontier
2h 09mDEN-STL
$178
6/2Sun
nonstop
2h 27mSTL-DEN
6/9Sun
multi-stop
6h 00mDEN-STL
$262
6/2Sun
multi-stop
8h 23mSTL-DEN
6/7Fri
multi-stop
6h 13mDEN-STL
$307
5/29Wed
multi-stopUnited Airlines
5h 20mSTL-DEN
6/5Wed
nonstopUnited Airlines
2h 04mDEN-STL
$552
5/29Wed
multi-stopUnited Airlines
5h 23mSTL-DEN
6/7Fri
nonstopUnited Airlines
2h 06mDEN-STL
$562
5/30Thu
multi-stopAmerican Airlines
7h 46mSTL-DEN
6/1Sat
multi-stopAmerican Airlines
8h 54mDEN-STL
$635
5/29Wed
multi-stopAmerican Airlines
7h 46mSTL-DEN
6/2Sun
multi-stopAmerican Airlines
6h 00mDEN-STL
$637
5/29Wed
multi-stopDelta
8h 26mSTL-DEN
6/4Tue
multi-stopDelta
5h 46mDEN-STL
$696

Search by stops

Search by airline

Search by price

St. Louis - Denver Flights

Departure:

St. Louis (STL)United States

Destination:

Denver (DEN)United States

Return flight deals:

Denver - St. Louis

Cabin classes:

$524
$619
$500
$74

Browse destinations: