IAD - STL

$59 Find Cheap Flights from Washington Dulles Airport to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to St. Louis departing on 1/27. 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

Search hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to St. Louis, 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 Washington, D.C. to St. Louis, as well as popular online travel agencies
In the last 7 days travelers have searched 46,646,933 times on KAYAK, and here is why:

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Cheap Flight Deals from Washington Dulles Airport to St. Louis (IAD-STL)

 
These are the cheapest deals for flights from Dulles Intl to St. Louis 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 Dulles Intl to St. Louis

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Dulles Intl to St. Louis.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
7:19 pm - 11:31 pmIAD-STL
29h 12m1 stop
8:22 am - 4:57 pmSTL-IAD
7h 35m1 stop
$138Frontier
Find Deal
Fri, Jan 31 - Sun, Feb 9
5:57 pm - 11:24 pmIAD-STL
6h 27m1 stop
5:02 pm - 4:56 pmSTL-IAD
22h 54m1 stop
$148Frontier
Find Deal
Sun, Dec 8 - Wed, Dec 11
7:19 pm - 11:31 pmIAD-STL
29h 12m1 stop
8:22 am - 4:57 pmSTL-IAD
7h 35m1 stop
$158Frontier
Find Deal
Fri, Jan 17 - Sun, Jan 19
6:50 pm - 8:23 pmIAD-STL
2h 33mnonstop
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
$229United Airlines
Find Deal
Sat, Jan 4 - Sat, Jan 11
6:50 pm - 8:23 pmIAD-STL
2h 33mnonstop
12:41 pm - 6:27 pmSTL-IAD
4h 46m1 stop
$239United Airlines
Find Deal
Sat, Jan 4 - Sat, Jan 11
6:00 am - 9:22 amIAD-STL
4h 22m1 stop
6:29 am - 11:50 amSTL-IAD
4h 21m1 stop
$248Delta
Find Deal
Tue, Dec 10 - Thu, Dec 19
7:09 pm - 11:43 pmIAD-STL
5h 34m1 stop
7:15 am - 2:36 pmSTL-IAD
6h 21m1 stop
$273Delta
Find Deal
Thu, Dec 12 - Sat, Dec 14
5:00 am - 8:54 amIAD-STL
4h 54m1 stop
6:02 pm - 11:55 pmSTL-IAD
4h 53m1 stop
$296American Airlines
Find Deal
Fri, Dec 13 - Mon, Dec 16
5:00 am - 8:50 amIAD-STL
4h 50m1 stop
5:03 am - 1:23 pmSTL-IAD
7h 20m1 stop
$331American Airlines
Find Deal
Thu, Dec 26 - Wed, Jan 1
5:15 am - 11:10 amIAD-STL
6h 55m1 stop
11:00 am - 11:05 pmSTL-IAD
11h 05m2 stops
$494Southwest
Find Deal
Fri, Dec 20 - Wed, Jan 8

Flights from Dulles Intl to St. Louis - Travel Insights & Trends

Get data-powered insights and trends into flights from Dulles Intl to St. Louis 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 Washington Dulles Airport to St. Louis?

The average price of all flights from Washington, D.C. Dulles Intl Airport to St. Louis clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to St. Louis on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from Washington Dulles Airport to St. Louis. For your return ticket, we recommend flying on a Tuesday and avoiding Sundays for the best deals.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Washington, D.C. Dulles Intl Airport to St. Louis, 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 Washington, D.C. Dulles Intl Airport to St. Louis is January, where tickets cost $283 on average. On the other hand, the most expensive months are March and November, where the average cost of tickets is $379 and $338 respectively.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to St. Louis?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Washington, D.C. Dulles Intl Airport to St. Louis, 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 Washington, D.C. Dulles Intl Airport to St. Louis, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 129 days before departure.

Good to know

Low season

January

High season

August

Cheapest flight

$59
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Washington Dulles Airport to St. Louis

When to book flights from Dulles Intl to St. Louis

Are your dates flexible? Find out the best times to travel from Dulles Intl to St. Louis 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 Washington Dulles Airport to St. Louis flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to St. Louis?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to St. Louis was $59 for a one-way ticket and $138 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and St. Louis?

    No, a passport isn't needed to fly from Washington Dulles Airport to St. Louis. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Washington Dulles Airport to St. Louis?

    When flying out of Washington Dulles Airport you will be using Washington, D.C. Dulles Intl. You will be landing at St. Louis, also known as Lambert-St Louis.

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

    American Airlines, and Alaska Airlines offer inflight Wi-Fi service on the Washington Dulles Airport to St. Louis flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to St. Louis?

    The Canadair (Bombardier) Regional Jet CRJ-550 is the aircraft model that flies most regularly on the Washington Dulles Airport to St. Louis flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to St. Louis?

    Star Alliance is the only airline alliance operating flights between Washington Dulles Airport and St. Louis.

  • On which days can I fly direct from Washington Dulles Airport to St. Louis?

    There are nonstop flights from Washington Dulles Airport to St. Louis on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to St. Louis are Delta and United Airlines. With an average price for the route of $301 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 $500 and an overall rating of 7.4.

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

    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 Washington Dulles Airport to St. Louis.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Washington Dulles Airport 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 Washington Dulles Airport to St. Louis?

    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 St. Louis with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and STL 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 Washington Dulles Airport to St. Louis?

    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 St. Louis from Washington Dulles Airport 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 Washington, D.C. Dulles Intl Airport to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $146 or less one-way and $359 or less round-trip.

Prefer to fly non-stop from Washington Dulles Airport to St. Louis?

Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Nonstop departures

Washington, D.C. Dulles Intl to Lambert-St Louis

Monday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Tuesday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Wednesday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Thursday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Friday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Saturday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Sunday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

See more direct flights

Nonstop returns

Lambert-St Louis to Washington, D.C. Dulles Intl

Monday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Tuesday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Wednesday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Thursday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Friday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Saturday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

Sunday

Avianca, Brussels Airlines, Copa Airlines, +2 more

Avianca, Brussels Airlines, +3 more

See more direct flights
See more direct flights

Top 3 airlines serving from Dulles Intl to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to St. Louis. 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 Dulles Intl to St. Louis? 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 8755 reviews
7.9Comfort
7.9Entertainment
8.2Boarding
8.5Crew
7.3Food
Airline reviews

I sat in comfort plus. It was fine. Seats were comfortable. I got drinks and snacks.

8.0 ExcellentAndrew, Nov 2024MCO - LGA
Read more Delta reviews

I sat in comfort plus. It was fine. Seats were comfortable. I got drinks and snacks.

Crew was nice. Flight was timely. Seats could be better as well as the food considering it’s first class.

Left on time and arrived early this extending our 31 minute transfer. Bags made it also!

Good and consistent Printer in lounge did not work for me :(

Most of my discomfort was going through TSA. However, the Delta seats had inadequate leg room and I tried my very best to connect to the wi-fi and it was a cumbersome process that finally gave me the info that I needed to sign in AFTER I had completed the flight...Why make it so difficult to use? That said I really really appreciate the pilot taking a little extra time to avoid a bad storm area and both landings in Atlanta and Orlando were flawless to my delight!!!

Delayed in taking off because no flight crew. The in seat entertainment was working properly.

I upgraded to first class only to find out that I still had no access to the sky lounge without a sky miles card or AmEx (something that should be emphasized outside of the fine print!) Also, no food or drink service provided during the flight, so I basically paid 4x more just for “free” checked baggage and a bigger seat. Not worth it.

Delta was really good about being transparent with why we were delayed it’s just that’s the plane was really old and outdated and a lot of the comfort and amenities we know Delta to have did not shine through

Bottom seat cushion is almost non existent. Very uncomfortable seat.

Delta was great the entertainment was outdated. Screen was very small and didn’t work.

The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.

This was a 5 hour flight with no entertainment and with a snack being provided (pretzels and fruit bar), which are both high in carbs and sugar. Nuts would have been a better choice.

Never nice, United Express partners always do an amazing job.

Everything was perfect except the pad at the top of the seat back. It pushes my head forward in a very uncomfortable position and it is not removable.

Good plane, crew, and flight. Boarding was a bit chaotic. Bathrooms were unacceptable. United DESPERATELY needs a new terminal at IAD.

United Airlines changed my flight 5 hours before I arrived at the airport. This messed up my entire day that I arrived in Japan.

Being stick waiting for gate at ORD cause me to almost miss my connecting flight…being deaf United made no no effort to keep me updated as I couldn’t hear the PA

The Economy Plus rows weren’t as roomy as expected, and the meal service left a lot to be desired for.

United ground crew and pilots are friendly. The in-flight staff (flight attendants) are the worst in the world. Multiple trips, always unpleasant, combative, use implicit threats to not allow for a discussion on their decision. Authoritarian. This seems to stem from an internal corporate wide policy as I doubt that United is intentionally searching for people that are not fit for customer facing positions. I will not fly United again. Good luck fixing your business

The flight was mostly on time, smooth and deplaning was quick. Baggage was really quick at the claim. Comfort was so-so and I paid for economy plus. It was still too crowded and why was a family of 5 scattered all around the plane?

No food, no entertainment. But the flight was really short so maybe they had to skip drinks. I was able to board early ONLY because I am old and decrepit and they let me pre-board. I RESENT your dumping us into category 9 if we do not pay up. And when I paid for a seat I was STILL given 9. The pre-boarding helps. THIS flight was exceptionally smooth, please congratulate the pilots.

On time (actually a little early). Was a good and short flight!

I had a TERRIBLE experience with the AA crew. I believe it was disability-related. It’s unlikely I will fly AA again.

Great - quick boarding and landed early with an available gate.

On time, smooth, luggage was out fast at the end of the flight. About perfect.

Flight departed on time and arrived a bit early. Can’t go wrong with that! And makes a travel experience go so well

WiFi wasn’t working on the flight, several delays and gate changes, ended up taking off 3 hrs later

delayed multiple times. no resolution on anything from AA customer service. was put on hold in chat to talk to manager. was 6th in line to talk to manager for more than TWELVE HOURS - from sometime around 9AM until well after I had gone to bed that evening. no explanation, no attempt to make it right. just a five hour delay because of repeated maintenance claims

I like the speed of boarding and deplaning and the fact that everything was on time. The crew (attendants) were probably quite new and did not begin the in cabin service until 30 min before landing even though there was little to no air turbulence for the last 1.5 hours of the flight. It made for a mad scramble at the end to get trash collected and carts stowed before touch down.

Gate check in of luggage was smooth at DCA and luggage came out fast in IND.

Book cheap flights from Washington, D.C. to St. Louis

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Washington, D.C. to St. Louis found on KAYAK in the last 72 hours.
1/27Mon
1 stopFrontier
6h 26mIAD-STL
$59
1/12Sun
1 stopFrontier
6h 30mIAD-STL
$63
12/25Wed
nonstopUnited Airlines
2h 24mIAD-STL
$115
1/8Wed
1 stopUnited Airlines
5h 42mIAD-STL
$124
1/2Thu
1 stopSouthwest
6h 55mIAD-STL
$148
12/14Sat
1 stopAmerican Airlines
4h 54mIAD-STL
$149
12/24Tue
1 stopAmerican Airlines
4h 50mIAD-STL
$183
3/6Thu
2 stopsSouthwest
10h 00mIAD-STL
$185
12/7Sat
1 stopDelta
4h 22mIAD-STL
$194
12/21Sat
1 stopDelta
5h 43mIAD-STL
$249

Search by stops

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Last minute flights from Dulles Intl to St. Louis

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 Washington, D.C. to St. Louis that are departing in the next 10 days.
11/26Tue
multi-stopDelta
4h 36mIAD-STL
11/27Wed
multi-stopDelta
3h 55mSTL-IAD
$538
11/25Mon
multi-stopDelta
6h 23mIAD-STL
12/2Mon
multi-stopDelta
4h 22mSTL-IAD
$598
11/26Tue
nonstopUnited Airlines
2h 26mIAD-STL
11/27Wed
multi-stopUnited Airlines
7h 18mSTL-IAD
$599
11/25Mon
multi-stopSouthwest
8h 55mIAD-STL
11/27Wed
multi-stopSouthwest
13h 05mSTL-IAD
$603
11/24Sun
multi-stopFrontier
14h 01mIAD-STL
11/26Tue
multi-stopFrontier
21h 59mSTL-IAD
$613
11/24Sun
nonstopUnited Airlines
2h 26mIAD-STL
11/29Fri
nonstopUnited Airlines
2h 08mSTL-IAD
$614
11/22Fri
multi-stopUnited Airlines
5h 07mIAD-STL
12/3Tue
nonstopUnited Airlines
2h 11mSTL-IAD
$624
11/26Tue
multi-stopAmerican Airlines
4h 49mIAD-STL
11/29Fri
multi-stopAmerican Airlines
7h 02mSTL-IAD
$633
11/25Mon
nonstopUnited Airlines
2h 26mIAD-STL
11/25Mon
nonstopUnited Airlines
2h 08mSTL-IAD
$634
11/26Tue
multi-stopAmerican Airlines
4h 49mIAD-STL
11/30Sat
multi-stopAmerican Airlines
6h 48mSTL-IAD
$709

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Everything you need to know for your flight from Dulles Intl to St. Louis

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