STL - BOI

$303 Find Cheap Flights from St. Louis to Boise

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Boise departing on 4/2. 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.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Boise, 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 Boise, as well as popular online travel agencies
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Cheap Flight Deals from St. Louis to Boise (STL-BOI)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Boise that are departing in the next months. 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 Boise

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to Boise.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
6:44 am - 12:32 pmSTL-BOI
6h 48m1 stop
9:40 am - 11:59 pmBOI-STL
13h 19m1 stop
$303Alaska Airlines
Find Deal
Wed, Apr 2 - Sun, Apr 6
6:40 pm - 11:55 pmSTL-BOI
6h 15m1 stop
5:35 am - 1:05 pmBOI-STL
6h 30m1 stop
$344Southwest
Find Deal
Fri, May 9 - Mon, May 12
7:37 pm - 8:44 pmSTL-BOI
26h 07m2 stops
9:49 pm - 6:32 pmBOI-STL
19h 43m3 stops
$355Spirit Airlines
Find Deal
Thu, May 8 - Mon, May 12
2:15 pm - 12:03 amSTL-BOI
10h 48m2 stops
5:45 pm - 12:37 amBOI-STL
5h 52m1 stop
$357Delta
Find Deal
Thu, May 8 - Mon, May 12
6:59 pm - 12:10 amSTL-BOI
6h 11m1 stop
5:45 pm - 12:37 amBOI-STL
5h 52m1 stop
$369Delta
Find Deal
Thu, May 8 - Mon, May 12
2:22 pm - 10:40 pmSTL-BOI
9h 18m1 stop
6:00 am - 5:23 pmBOI-STL
10h 23m2 stops
$378Alaska Airlines
Find Deal
Wed, Apr 2 - Sun, Apr 6
5:10 am - 11:19 pmSTL-BOI
19h 09m1 stop
7:05 am - 4:41 pmBOI-STL
8h 36m1 stop
$474American Airlines
Find Deal
Sat, Mar 15 - Wed, Mar 19
6:04 am - 12:40 pmSTL-BOI
7h 36m1 stop
2:11 am - 8:46 amBOI-STL
5h 35m1 stop
$607American Airlines
Find Deal
Tue, Jul 22 - Sun, Jul 27
1:45 pm - 1:38 pmSTL-BOI
24h 53m1 stop
5:25 pm - 12:12 pmBOI-STL
17h 47m2 stops
$1,068United Airlines
Find Deal
Fri, Mar 7 - Mon, Mar 10
3:35 pm - 10:02 amSTL-BOI
19h 27m2 stops
5:25 pm - 12:12 pmBOI-STL
17h 47m2 stops
$1,088United Airlines
Find Deal
Fri, Mar 7 - Mon, Mar 10

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

Get data-powered insights and trends into flights from St. Louis to Boise 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 Boise?

The average price of all round-trip flights from St. Louis to Boise clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from St. Louis to Boise, look for departures on Wednesdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Boise, Tuesday is the cheapest day to fly and Monday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Boise, 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 Boise is October, where tickets cost $351 (return) on average. On the other hand, the most expensive months are March and November, where the average cost of round-trip tickets is $539 and $503 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Boise, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from St. Louis to Boise, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know

Low season

February

High season

August

Cheapest flight

$303
Best time to beat the crowds but there is an average 9% increase in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from St. Louis to Boise

When to book flights from St. Louis to Boise

Are your dates flexible? Find out the best times to travel from St. Louis to Boise 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 Boise

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

    In the last 3 days, the lowest price for a flight from St. Louis to Boise was $313 for a one-way ticket and $303 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from St. Louis to Boise?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Boise, also known as Boise Air Term. Gowen Fld.

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

    We unfortunately don’t have that data for this specific route.

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

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between St. Louis and Boise, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Boise, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to Boise are Southwest and Delta. With an average price for the route of $506 and an overall rating of 8.1, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $410 and an overall rating of 8.0.

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

    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 Boise.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boise 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 Boise?

    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 Boise with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and BOI 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 Boise?

    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 Boise 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

Top 4 airlines serving from St. Louis to Boise

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Boise. 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 Boise? 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.
8.1
SouthwestOverall score based on 4411 reviews
7.1Food
8.7Crew
7.6Entertainment
8.2Boarding
8.1Comfort
Airline reviews

Gate agents were informative and friendly… flight attendants were as well. Had a fun time chatting about their legacy AirTran experiences as a former fan of the airline that Southwest acquired.

10.0 ExcellentAnonymous, Jan 2025ATL - LGA
Read more Southwest reviews

Gate agents were informative and friendly… flight attendants were as well. Had a fun time chatting about their legacy AirTran experiences as a former fan of the airline that Southwest acquired.

Flight was awfully bumpy and landing was a bit jolting. I was in the restroom when snacks and drinks were served and was not asked if i wanted any. I had to ask for water finally.

Wi Fi was horrible kept cutting out the whole time and too expensive

I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.

Boarding was a little late, but made up for it. It was quick to taxi to the runway, since it's a smallish airport.

Excellent! Only question is how we check in at exactly 24 hours in advance and end up at the end of the B boarding group

Multiple delays and gate changes. Arrived at final destination 6 hours late. All rental cars had been taken.

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

It was 2 hours 45 minutes late, for no apparently clear reason.

I recently flew Southwest from San Jose to Honolulu. I was very impressed with the flight crew, especially the flight attendant in charge of the front of the plane. She came through the aisle at least five times for drinks and water, and two times for snacks. I have not seen such service since I flew first class. Also, for the first time, they gave us the correct baggage claim number, and the luggage came out quickly. I can't wait for Southwest to have assigned seating! I absolutely hate the Cattle Call boarding procedure and the mad dash to get seats and overhead bins. However, the boarding was efficient.

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

I loved having a most black flight crew during Black History Month; rather by design or accident I appreciated the representation. ❤️

This was the second flight this week with flight attendant Marcus I’m not sure if his last name is Lane or Lang but this guy is awesome. He funny, attentive and his service is 5 stars. Marcus makes business travel more enjoyable !

Although the flight left late, we arrived early. It was one of the quickest boarding and off boarding experiences I’ve had. It was kind of annoying the only drinks they had were water, coffee, and tea. The flight was very smooth, temperature was just right, and flight attendants were friendly.

Lower number on this flight so spaced out passengers. Able to enjoy more room to relax during flight. It was lovely.

Kind staff. Snacks are small but that’s the new normal.

The young man who was our flight attendant in first class was lazy and did not do his job well at all. Never offered drinks upon boarding - actually I take that back... said "are you okay with water" as if I do not want to get you anything else, only passed the snacks around once, got my drink order wrong and then never offered a second round of drinks. He was the worst I have ever seen on Delta and we fly a lot.

Great service. Great staff. Boarding was a little slow, but I think there was a service dog slowing things down.

Flight left early and arrived early. the whole trip was excellent.

Seats were really tight and the seat belts did not give enough slack.

I don’t understand the purpose of the orange “priority” tag on my bag. This tagged, my bag is last or near to the last bag to come down the carousel at IAH.

The tv monitor in front of my seat was not responding. The flight crew reset it and it still didn’t work.

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

Terrible. First of all we were delayed 4 3/4 hours departing Honolulu. As we had to leave our condo and the rental car had to be returned we had to go to the airport. Even though we had a business class boarding pass to Washington, since we did not have business class to Montreal we could not access the lounge without paying a $59 fee each. This does not make sense to us. Since we could not meet our original connection United booked us to Montreal via New York LaGuardia on Air Canada. In Washington a further delay got us into LaGuardia too late to make our connection to Montreal so we were booked on another Air Canada flight 3 hours later. We were originally scheduled to arrive in Montreal at 10:40 and arrived at 19:55. A totally exhausting day, United did not offer a meal voucher or any type of compensation. Air Canada did give us a digital meal voucher. The food in United business class is poor among all meals offered. The pods look nice but are not that confortable. Overall would not fly on United again.

Plenty of room for me and the cat in Premium Economy. Seat was comfortable. Boarding was a breeze. The lady at the special check-in desk was great, super helpful and professional.

For the most part united was a good experience, how ever when they came by with the snacks and water, they completely passed by my wife and I. As we were in separate rows. On a 5 hr flight we were not offered water

Fantastic crew. Flight was delayed at last minute but we were given updates every 20 minutes and the crew was so friendly and considerate. I miss the touch screens on the back of the seats, wish they would bring that back though.

Our seats were all the way in back of the plane,

Food choices were very limited. Taste of the dishes was average.

Maybe add a seat trade app for flyers that didn’t get seats together

Delays on all NY flights. There was no communication on why but they didn’t say it was weather. Other carriers were not delayed.

The flights were terribly delayed and then cancelled which forced us booking another night at the hotel. Very poor management from American Airlines

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

I flew out of Reagan National. My flight was delayed, delayed, delayed, and then canceled ...THREE TIMES over TWO DAYS. Staff were seemingly not empowered to provide information on why the flights were screwed up. A real nightmare.

They cancelled our flight without warning OR a refund. Never doing business with American Airlines again! This is the second AA booked trip in a row that we've had challenges with.

Crew was late. Baggage was late. 2hs inside the plane waiting fro de-icing and traffic. A 3:30hs flight ended up being almost 6hs inside the airplane.

Flight delayed on both ends - have a gate ready at DCA, don't make us sit for 30min after being late to take off as well.

The seats were crammed and the guy in front of me wouldn't stop reclining. If AA is cramming extra rows in, they need to take away the reclining in coach. My knees were smashed for 4 1/2 hours and I was very close to confronting the passenger in front of me.

This flight didn’t happen because AA agents didn’t let us board the flight

It was so bad it will be my last. Connecting flight gate agent closed the door in my face when i told her my husband is 30 seconds away (and we were running close/late because the preceding AA flight was slightly delayed. We had to be rebooked on a non-direct flight with an overnight layover in Phoenix. This is the worst experience ever and for no fault of our own. The flight we were trying to get on would not have been late if the gate agent allowed my husband to get there. It was senseless, cruel and very upsetting. I don’t understand why we were subjected to this.

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