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IAD - STL

Find cheap flights from Washington Dulles Airport to St. Louis from $93

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 4/24. 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
Sat 4/27
Sat 5/4

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 47,584,047 times on KAYAK, and here is why:

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

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Cheap flight deals from Dulles Intl to St. Louis

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to St. Louis 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.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
8:32 am - 9:59 amIAD-STL
2h 27mnonstop
11:10 am - 4:23 pmSTL-IAD
4h 13m1 stop
$168United Airlines
Find Deal
Sat, May 4 - Tue, May 7
6:00 am - 10:59 amIAD-STL
5h 59m1 stop
6:12 pm - 10:52 pmSTL-IAD
3h 40m1 stop
$176Delta
Find Deal
Sat, May 4 - Wed, May 8
6:00 am - 10:59 amIAD-STL
5h 59m1 stop
4:45 pm - 11:59 pmSTL-IAD
6h 14m1 stop
$177Delta
Find Deal
Sat, Apr 20 - Sat, Apr 27
7:04 am - 11:56 amIAD-STL
5h 52m1 stop
6:30 am - 11:39 amSTL-IAD
4h 09m1 stop
$178Delta
Find Deal
Wed, Apr 17 - Wed, Apr 24
6:00 am - 9:20 amIAD-STL
4h 20m1 stop
11:45 am - 5:26 pmSTL-IAD
4h 41m1 stop
$186Delta
Find Deal
Sat, Apr 27 - Tue, Apr 30
8:32 am - 9:59 amIAD-STL
2h 27mnonstop
8:27 am - 11:37 amSTL-IAD
2h 10mnonstop
$194United Airlines
Find Deal
Sat, May 4 - Tue, May 7
5:31 pm - 11:20 pmIAD-STL
6h 49m1 stop
2:38 pm - 7:44 pmSTL-IAD
4h 06m1 stop
$225American Airlines
Find Deal
Tue, Sep 10 - Wed, Sep 11
5:02 am - 9:53 amIAD-STL
5h 51m1 stop
5:04 am - 11:15 amSTL-IAD
5h 11m1 stop
$249American Airlines
Find Deal
Wed, May 8 - Thu, May 9
12:30 pm - 12:38 pmIAD-STL
25h 08m1 stop
7:00 am - 11:47 amSTL-IAD
27h 47m1 stop
$307Sun Country Air
Find Deal
Thu, Apr 18 - Sun, Apr 21
11:45 am - 12:20 pmIAD-STL
25h 35m1 stop
8:15 am - 2:02 pmSTL-IAD
4h 47m1 stop
$355Sun Country Air
Find Deal
Thu, May 16 - Sun, May 19

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 Thursday, as we generally find the cheapest rates on that day for this route. On the other hand, Tuesday 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 February, where tickets cost $284 on average. On the other hand, the most expensive months are June and November, where the average cost of tickets is $391 and $388 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 50 days before departure.

Which airlines provide the cheapest flights from Washington Dulles Airport to St. Louis?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on Delta ($93) and United Airlines ($139). The cheapest round-trip tickets were found on United Airlines ($168) and Delta ($176).

Which airlines fly non-stop between Washington, D.C. Dulles Intl Airport and St. Louis?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Washington, D.C. Dulles Intl Airport to St. Louis.
There is just one airline that flies from Washington, D.C. Dulles Intl Airport to St. Louis direct and that is United Airlines. The best one-way deal found from United Airlines for the route is $219.

How many flights are there between Washington, D.C. Dulles Intl Airport and St. Louis per day?

Each day, there are 2 nonstop flights that take off from Washington, D.C. Dulles Intl Airport and land in St. Louis, with an average flight time of 2h 28m. The most common departure time is 5:00 pm and most flights take off in the afternoon. Each week, there are 14 flights and there are the same amount of flights each day 2.

Which cabin class options are there for flights between Washington, D.C. Dulles Intl Airport and St. Louis?

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 3 cabin class options for the route. These are 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 Washington Dulles Airport to St. Louis take?

The duration of a nonstop flight to St. Louis from Washington Dulles Airport is typically 2h 12m. The journey crosses a distance of 694 miles.

What’s the earliest departure time from Washington Dulles Airport to St. Louis?

Early birds can take the earliest flight from Washington, D.C. Dulles Intl Airport at 8:32 am and will be landing in St. Louis at 9:59 am.

What’s the latest departure time from Washington Dulles Airport to St. Louis?

If you prefer to fly at night, the latest flight from Washington, D.C. Dulles Intl Airport to St. Louis jets off at 5:50 pm and lands at 7:19 pm.

Good to know

Low season

August

High season

September

Cheapest flight

$93
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly with an average 2% increase in price.
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 $93 for a one-way ticket and $168 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?

    Only American Airlines offers 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 $310 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 $449 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

Top tips for finding a cheap flight from IAD to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $269 or less one-way and $349 or less round-trip.

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

Find which airlines fly direct from Dulles Intl to Lambert-St Louis, 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, +3 more

Avianca, Brussels Airlines, +4 more

Tuesday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Wednesday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Thursday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Friday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Saturday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Sunday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

See more direct flights

Nonstop returns

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

Monday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Tuesday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Wednesday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Thursday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Friday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Saturday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

Sunday

Avianca, Brussels Airlines, Copa Airlines, +3 more

Avianca, Brussels Airlines, +4 more

See more direct flights
See more direct flights

Top 3 airlines serving from Dulles Intl to St. Louis

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 KAYAK reviews.
8.0
DeltaOverall score based on 11418 reviews
80entertainment
75food
81overall
82boarding
86crew
79comfort
Airline reviews

Delta did an awful job w logistics at DTW. Missed connection. We were there an hour early. SUCKED

Read more about Delta

Delta did an awful job w logistics at DTW. Missed connection. We were there an hour early. SUCKED

Inflight entertainment stopped working as we taxi to runway and never worked again until landing and taxi to gate. Grrrr

Had to run to make it only to have the flight delayed to wait for all the late connectors Second drink service skipped up

Boarding was a sh!t show. JFK BOARDING was awful. The agent called three sections at a time Clogging the area then yelling at people to not block the walk way. How are you going to call delta one , premium select and comfort plus at once and the yell at highest paying passengers. Need to do a lot better and the flight attendants in the galley need to understand that their voices travel. They were talking about others and everyone in the cabin heard them

Uncomfortable seats on 14 hour flight. Mediocre food. On time and great crew.

MSP to Atlanta was much better than Atlanta to St. Kitts. Paid $180 each for myself and wife for Delta comfort from Atlanta to St. Kitts. Seats were more narrow and obviously old and worn out. Tailbone is killing me. Seat would not recline. Seats behind reclined and we were not an exit row or in front of an exit row. Entertainment did not work in that the movie jumped forward and back and there was no audio. The plug in the arm rest was loose. Flight attendant tried “resetting” the video for my seat but no good. She never checked back. Someone else near me had the same issue. Touch screen was unresponsive. No where near as comfortable as MSP to Atlanta flight. 3 plus hrs. flight time without the basic amenities and not even remotely close to comfortable but paid for Comfort plus. I will be very disappointed if I have the same on my return “Comfort Plus” flight St. Kitts to Atlanta. At the very least my wife and I should be refunded for round trip “Comfort Plus” charges. Please feel free to contact me directly for more details.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

Great experience overall. Check in at Austin was congested as they only have about 6 check in kiosks, one was broken, and there was a lot of Spring Break travelers.

The main person that was coordinating everything was a short white/light skin Spanish man and he was very rude. It honestly made me feel like it was everyone’s First day at work. His announcements were very not reasonable and they did not make sense. The stewardess on the flight that made the announcements she didn’t even know what she was talking about she sounded inebriated. There were no snacks or drinks on our flight there wasn’t even much turbulence. This flight was not enjoyable nor was it what a Delta flight should be and just this past week I flew with Delta 3 times.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

The crew were really great, but the 4 hour delay in small chunks was the worst.

Just a crappy airline. The same every time. You feel you are a cow on a farm. You are being being whipped and pulled.

Wasn’t very crowded. Seamless processes. No issues traveling with two little kids.

My interaction with the flight attendent Eve was horrible. I was seated in 3F and was blown away watching her repeatedly skip me as she took other customer orders for lunch...she took the customer next to me but skipped me, then took everyone's order around me (in front of and behind me) . After she had taken every customer's orders to include those behind me, she came to me and said we are out of everything except one last item. I was mortified, in that, I am a 1k flyer, had pre-ordered AND as an African American could only assume why she repeatedly skipped me...mortified. no words

The Flight was good, pilot seemed very skillful. My wheel chair sister who could barely walk was allotted the second last seat in the aircraft, with great difficulty she managed to reach on her seat, as she required attendance we were given separate seat, even on request no one cared, so much so there were single passengers who were given twin seats. May not be taken as complaint but a reminder to the checkin staff to keep in mind in future the allottment of wheel chair passengers seats.

Almost 2 hour delay in boarding with all standing ready to board at original time. No explanation given.

787-9 Transcon from IAD-LAX FYI no meals in premium plus, not considered Premium - seats are wonderful https://www.united.com/ual/en/us/fly/travel/inflight/premium-services.html Horrible handling of delayed flight

It was a great experience. Do not normally fly United. Very nice. Thank you and happy holidays

I was crammed against a person too large for one seat. This traveler (who I’m sure you have a record of, 21E) should be required to purchase two tickets in the future. Also, your streaming service kept kicking me out of my movie.

Happy to see coffee was served and the air hostesses were v.attentive. Thanks.

Lots of weather delays that were poorly communicated and managed. I get there are weather delays but they didn’t make it clear what was happening or comfortable on the plane

Everything was on time; the flight attendants and the gate personnel were very pleasant and helpful.

Our second leg to Jackson WY was unable to land due to weather. We were flown back to Dallas after stopping in SLC. We were given hotel rooms and vouchers. We were told that we would be back on the same plane in the morning. Instead we were given a different flight with different seats. Not a good experience. No one knew what was going on.

Perfect flight. On time departure and early arrival. Smooth flight.

Awful! The flight was delayed and we sat on the plane in DCA for an hour because fuel was out in the wrong part of the plane and would not be accessible during flight. So the plane had to be refueled in correct tank. They also allowed someone to get off of the plane. This delayed my six hour flight by an hour and made me miss my connecting flight. I ran to new gate and American Airlines agents new about the delay and even knew that I was trying to make the connection. They knew thru communication with my friend while in flight that I was in the airport and running to the new gate and they still closed the gate and refused to let me on the new flight despite plane still being at the gate. It was horrible and I had to be rebooked on a flight for 24 hours later. This has been a nightmare and if American Airlines can cause customers to be delayed and then have zero empathy as having an on time flight was more important to them than helping a customer who was delayed by no fault of her own, then it's seems that it's not a company that I want to continue to give my loyalty to. I'm so disgusted.

Help was available but timing was bad in my case

It was a horrible snow storm, but updates were inconsistent and the app never displayed a remotely accurate time or gate until very close to boarding.

The flight was so short that the lack of leg room didn't bother me for long. The plane was smaller so only two seats per row and there were chargers. However, they didn't serve any snacks.

Staff were very helpful to my dad in a wheelchair. Thank you.

The seats are so small and we are average size people. We paid for emergency row for the leg room but the seats are tiny.

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.
4/24Wed
1 stopDelta
4h 20mIAD-STL
$93
4/23Tue
1 stopDelta
4h 15mIAD-STL
$94
4/7Sun
2 stops
35h 29mIAD-STL
$130
5/13Mon
1 stopUnited Airlines
5h 26mIAD-STL
$139
4/9Tue
1 stopAmerican Airlines
6h 09mIAD-STL
$149
4/29Mon
3 stops
21h 24mIAD-STL
$152
4/25Thu
nonstopUnited Airlines
2h 27mIAD-STL
$155
4/11Thu
1 stopAmerican Airlines
6h 09mIAD-STL
$164
4/19Fri
2 stopsAlaska Airlines
15h 30mIAD-STL
$369
4/21Sun
2 stopsAlaska Airlines
17h 10mIAD-STL
$624

Search by stops

Search by airline

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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.
4/1Mon
multi-stopAmerican Airlines
4h 46mIAD-STL
4/15Mon
multi-stopAmerican Airlines
6h 18mSTL-IAD
$506
3/31Sun
nonstopUnited Airlines
2h 27mIAD-STL
4/3Wed
nonstopUnited Airlines
2h 10mSTL-IAD
$574
4/1Mon
nonstopUnited Airlines
2h 29mIAD-STL
4/15Mon
multi-stopUnited Airlines
4h 43mSTL-IAD
$579
3/31Sun
multi-stopDelta
4h 15mIAD-STL
4/2Tue
multi-stopDelta
3h 50mSTL-IAD
$582
3/31Sun
nonstopUnited Airlines
2h 27mIAD-STL
4/8Mon
multi-stopUnited Airlines
5h 34mSTL-IAD
$583
3/31Sun
multi-stopAmerican Airlines
4h 20mIAD-STL
4/3Wed
multi-stopAmerican Airlines
5h 12mSTL-IAD
$590
3/29Fri
nonstopUnited Airlines
2h 27mIAD-STL
3/31Sun
nonstopUnited Airlines
2h 10mSTL-IAD
$599
3/30Sat
nonstopUnited Airlines
2h 37mIAD-STL
4/1Mon
multi-stopUnited Airlines
5h 34mSTL-IAD
$607
3/29Fri
nonstopUnited Airlines
2h 27mIAD-STL
4/1Mon
multi-stopUnited Airlines
5h 34mSTL-IAD
$608
3/30Sat
multi-stopAmerican Airlines
6h 26mIAD-STL
4/1Mon
multi-stopAmerican Airlines
6h 29mSTL-IAD
$614

Search by stops

Search by airline

Search by price

Washington Dulles Airport - St. Louis Flights

Departure:

Washington Dulles Airport (IAD)United States

Destination:

St. Louis (STL)United States

Return flight deals:

St. Louis - Washington Dulles Airport

Cabin classes:

$1,241
$636
$582
$215