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

IAD - STL

$88 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 10/7. 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
Fri 7/12
Fri 7/19

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 44,148,666 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 Dulles Intl to St. Louis (IAD-STL)

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
8:35 am - 9:56 amIAD-STL
2h 21mnonstop
11:09 am - 6:34 pmSTL-IAD
6h 25m1 stop
$167United Airlines
Find Deal
Sat, Sep 21 - Thu, Sep 26
6:30 am - 10:07 amIAD-STL
4h 37m1 stop
5:20 pm - 12:15 amSTL-IAD
5h 55m1 stop
$170United Airlines
Find Deal
Fri, Sep 13 - Mon, Sep 16
5:03 am - 8:19 amIAD-STL
4h 16m1 stop
7:00 am - 12:38 pmSTL-IAD
4h 38m1 stop
$176American Airlines
Find Deal
Wed, Aug 14 - Tue, Aug 20
6:00 am - 9:09 amIAD-STL
4h 09m1 stop
5:26 pm - 10:59 pmSTL-IAD
4h 33m1 stop
$188Delta
Find Deal
Mon, Jul 1 - Tue, Jul 2
7:11 pm - 11:39 pmIAD-STL
5h 28m1 stop
6:11 pm - 11:03 pmSTL-IAD
3h 52m1 stop
$202Delta
Find Deal
Mon, Aug 5 - Fri, Aug 9
5:03 am - 8:19 amIAD-STL
4h 16m1 stop
7:00 am - 12:38 pmSTL-IAD
4h 38m1 stop
$220American Airlines
Find Deal
Fri, Aug 16 - Tue, Aug 20
12:40 pm - 8:01 pmIAD-STL
8h 21m1 stop
5:45 pm - 9:44 amSTL-IAD
14h 59m1 stop
$285Sun Country Air
Find Deal
Sat, Jun 22 - Sun, Jun 30
8:25 am - 7:07 amIAD-STL
23h 42m3 stops
5:20 pm - 7:20 amSTL-IAD
37h 00m3 stops
Thu, Sep 5 - Sun, Sep 8
8:20 pm - 5:29 pmIAD-STL
22h 09m2 stops
6:41 pm - 10:30 amSTL-IAD
14h 49m1 stop
Fri, Jul 12 - Sun, Jul 14
12:03 pm - 9:29 amIAD-STL
22h 26m1 stop
6:30 pm - 11:30 amSTL-IAD
16h 00m1 stop
$335Sun Country Air
Find Deal
Thu, Jul 4 - Sun, Jul 7

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 Saturday 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 $289 on average. On the other hand, the most expensive months are March and November, where the average cost of tickets is $378 and $351 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 73 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 American Airlines ($88) and Delta ($114). The cheapest round-trip tickets were found on United Airlines ($167) and American Airlines ($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 $225.

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 13m. The most common departure time is 5:00 pm and most flights take off in the morning. 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 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 Washington Dulles Airport to St. Louis take?

The duration of a nonstop flight to St. Louis from Washington Dulles Airport is typically 2h 07m. 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 8:15 am and will be landing in St. Louis at 9:22 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 5:55 pm and lands at 7:19 pm.

Good to know

Low season

January

High season

December

Cheapest flight

$88
Best time to beat the crowds but there is an average 9% increase in price.
Most popular time to fly and prices are also 25% 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 $88 for a one-way ticket and $167 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 $287 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

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 $267 or less one-way and $432 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, +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 10000 reviews
8.0Entertainment
7.9Comfort
8.2Boarding
8.6Crew
7.4Food
Airline reviews

It was very cold because the air conditioner was on high power, and my son got sick.

4.0 OkayAnonymous, Jun 2024ORD - SEA
Read more about Delta reviews

It was very cold because the air conditioner was on high power, and my son got sick.

3 hours late and all they have is was a $12 meal voucher. That’s not even enough to cover fast food.

Among the poorest flights I’ve had with Delta in a while. Entertainment system failed completely on a 7.5 hr flight. Crew seemed distracted and not the normal friendly crew. Flight overbooked it seemed… very crowded.

If I can, I always fly Delta. I’ve found their service to always be reliable and pleasant.

You could have not cancelled the flight (AA, which I will be flying from now on) left for BOS despite the fictitious weather issues (that no one in my Boston family could see). You could have rebooked my direct flight to another direct flight instead of sending me though JFK, the worst US airport after O’Hara You could have rebooked me on a Main Cabin seat (like the one I paid for in my original ticket instead of putting me a the last row on JFK->BOS leg, pocketing the difference in ticket price But I do not really care whether you will ever do that in a future because in a future neither I nor anyone from my company (unless they pay out of pocket) nor an of my clients and partners (if they heed my advice) will ever be caught dead on any of Delta flights

Really bad baggage handling. Had my Rimowa bag badly damaged at the latches.

It was pretty good I was worried with the short Layover that I might not catch my connection but the gate was there

It was good until there was a 3 hour delay because there was not any pilots to fly the plane.

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

Friendly flight attendants. Comfort plus seats were very comfortable and had lots of leg room. 10A and 10 B.

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.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

Last minute gate change nearly caused us to miss our flight. Change was not announced or displayed in the main board at the old gate. Terrible communication. When we landed we had to wait 20 minutes because there was another plane at the assigned gate. Not the crew’s fault, but adding 20 minutes to a 45 minute flight sucked.

they made me check my carryon. There was space in the overhead bins.

The plane was delayed 2 hours. The wifi did not work. The seat in first class was not comfortable because the bottom felt like it lost all of its padding. And I did not like when the flight attendant made me wait at my seat to use the bathroom and didn't tell me why. If there were too many people using the 1st Class bathroom, she should have told me to go in the back, coach bathrooms. I guess I have to feel fortunate that they found 2 local pilots to still fly the plane tonight after the original pilots ended up at an airport 60 miles away due to high winds.

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.

This is by far the worst experience I have had with American Airlines. The start of this trip was a complete disaster. I purposely planned my trip so that I would weather any delays so that I could make very important meeting at the Pentagon. My flight was cancelled because of maintenance and I was put on the first flight the next day but I was late to the meeting. After a long week at the Pentagon I just wanted to go home and my flight home which was early in the day was delayed. Eventually the flight was delayed until the next day. I was not authorized a hotel room because DCA was my point of origin. So I paid for a hotel out of pocket. The flight this morning was boarded then deplaned because the aircraft was hot. The flow of information was not happening in DCA and made it worse when the news was bad. I am going to take a break from American for my next few military flights. Hopefully whatever has been going on with American Airlines will be resolved.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

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

Overall the flights pretty good. The snacks we’re good and they were plenty of them. Both boarding and deplaning went quickly.

Delayed abs delayed Gate crew giving poor info - we are definitely leaving at —- Ultimately to cancel flight after 4+ hours of delays Just cancel it earlier

The flight was scheduled to depart DCA at 12:30 pm but was delayed twice on the ground so that we were finally scheduled to depart at around 4:00 pm. Once we boarded, it was announced that takeoff would be delayed again to fix a hydraulic problem which delayed our eventual takeoff until around 5:00 pm. Once we departed, it was a smooth flight back to ORD. We did not get any explanation about what caused the original significant delay. In my experience, this happens frequently with AA.

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.

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.
10/7Mon
1 stopAmerican Airlines
4h 02mIAD-STL
$88
7/20Sat
1 stopDelta
5h 06mIAD-STL
$114
11/10Sun
1 stopSun Country Air
6h 34mIAD-STL
$133
7/3Wed
1 stopAmerican Airlines
4h 33mIAD-STL
$138
7/3Wed
1 stopDelta
4h 55mIAD-STL
$139
8/2Fri
1 stopAmerican Airlines
4h 30mIAD-STL
$159
7/3Wed
3 stops
24h 53mIAD-STL
$168
6/18Tue
1 stopSun Country Air
27h 56mIAD-STL
$178
9/20Fri
2 stopsUnited Airlines
12h 47mIAD-STL
$237
6/18Tue
nonstopUnited Airlines
2h 12mIAD-STL
$240

Search by stops

Search by airline

Search by price

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.
6/17Mon
multi-stop
30h 58mIAD-STL
6/20Thu
multi-stop
6h 49mSTL-IAD
$460
6/15Sat
multi-stopUnited Airlines
5h 07mIAD-STL
6/19Wed
multi-stopUnited Airlines
13h 46mSTL-IAD
$544
6/15Sat
multi-stopUnited Airlines
4h 38mIAD-STL
6/18Tue
nonstopUnited Airlines
2h 10mSTL-IAD
$545
6/15Sat
multi-stopDelta
4h 47mIAD-STL
6/18Tue
multi-stopDelta
4h 44mSTL-IAD
$554
6/13Thu
multi-stopSun Country Air
25h 01mIAD-STL
6/16Sun
multi-stopSun Country Air
5h 23mSTL-IAD
$560
6/13Thu
nonstopUnited Airlines
2h 12mIAD-STL
6/15Sat
nonstopUnited Airlines
2h 09mSTL-IAD
$567
6/16Sun
nonstopUnited Airlines
2h 12mIAD-STL
6/19Wed
multi-stopUnited Airlines
13h 46mSTL-IAD
$571
6/15Sat
multi-stopAmerican Airlines
5h 49mIAD-STL
6/23Sun
multi-stopAmerican Airlines
5h 21mSTL-IAD
$575
6/14Fri
multi-stopDelta
4h 45mIAD-STL
6/17Mon
multi-stopDelta
4h 13mSTL-IAD
$618
6/16Sun
multi-stopAmerican Airlines
4h 48mIAD-STL
6/19Wed
multi-stopAmerican Airlines
16h 59mSTL-IAD
$789

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
$560
$696
$312