DCA - STL

$119 Find Cheap Flights from Reagan Washington National 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 Reagan-National to St. Louis departing on 7/21. 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
1 adult, Economy, 0 bags

KAYAK searches 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
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Everything you should know

Cheapest round-trip
$269
Typical prices: $453-$241
American Airlines
Sat 10/10Sat 10/17
DCA - STL • Non-stop
Cheapest one-way
$119
Typical prices: $128-$294
American Airlines
Tue 7/21
DCA - STL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest offers two free checked bags for family trips.
DCA's metro access eases travel from downtown D.C.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $269 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with American Airlines and Southwest. Average duration is 2h 20m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $260 (round-trip)
Shortest trip • 4h 05m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 58% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
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+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Reagan-National to St. Louis (DCA-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Reagan-National 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Reagan-National to St. Louis

Sat, Oct 10 - Sat, Oct 17
American Airlines Logo
2:54 pm - 4:11 pm
DCA
-
STL
2h 17mnonstop
American Airlines Logo
10:54 am - 1:59 pm
STL
-
DCA
2h 05mnonstop
$269American Airlines
Thu, Sep 17 - Sun, Sep 20
Frontier Logo
7:00 am - 7:15 pm
DCA
-
STL
13h 15m
1 stop
Frontier Logo
8:10 pm - 12:49 pm
STL
-
DCA
15h 39m
1 stop
$270Frontier
Tue, Jun 16 - Wed, Jun 17
Southwest Logo
11:45 am - 2:50 pm
DCA
-
STL
4h 05m
1 stop
Southwest Logo
6:15 pm - 11:15 pm
STL
-
DCA
4h 00m
1 stop
$272Southwest
Tue, Aug 4 - Thu, Aug 6
Southwest Logo
8:00 am - 9:10 am
DCA
-
STL
2h 10mnonstop
Southwest Logo
10:10 am - 2:55 pm
STL
-
DCA
3h 45m
1 stop
$273Southwest
Wed, Sep 23 - Sat, Sep 26
Southwest Logo
2:40 pm - 3:55 pm
DCA
-
STL
2h 15mnonstop
Southwest Logo
3:00 pm - 6:00 pm
STL
-
DCA
2h 00mnonstop
$274Southwest
Sat, Aug 1 - Mon, Aug 3
Frontier Logo
6:00 pm - 7:23 pm
DCA
-
STL
26h 23m
1 stop
Frontier Logo
8:08 pm - 9:59 pm
STL
-
DCA
24h 51m
1 stop
$275Frontier
Wed, Jun 17 - Sat, Jun 20
Southwest Logo
8:00 am - 9:10 am
DCA
-
STL
2h 10mnonstop
Southwest Logo
11:55 am - 2:55 pm
STL
-
DCA
2h 00mnonstop
$276Southwest
Wed, Jun 17 - Wed, Jul 22
Delta Logo
6:20 am - 11:49 am
DCA
-
STL
6h 29m
1 stop
Delta Logo
6:05 am - 12:42 pm
STL
-
DCA
5h 37m
1 stop
$277Delta
Tue, Jun 30 - Mon, Aug 10
Southwest Logo
11:45 am - 2:50 pm
DCA
-
STL
4h 05m
1 stop
Southwest Logo
6:05 am - 11:50 am
STL
-
DCA
4h 45m
1 stop
$278Southwest
Sat, Sep 12 - Mon, Sep 14
Southwest Logo
6:40 pm - 7:50 pm
DCA
-
STL
2h 10mnonstop
Southwest Logo
2:20 pm - 7:50 pm
STL
-
DCA
4h 30m
1 stop
$279Southwest
Booking Insights

KAYAK's insights & trends for Reagan-National to St. Louis flights

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

How much is a round-trip flight from Washington, D.C. Reagan-National Airport to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Reagan-National Airport to St. Louis departing in October.

What’s the cheapest day of the week to fly from Reagan Washington National Airport to St. Louis?

The average price of all round-trip flights from Washington, D.C. Reagan-National Airport to St. Louis clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Reagan Washington National Airport to St. Louis, look for departures on Saturdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from St. Louis, Saturday is the cheapest day to fly and Monday is the most expensive.

What is the cheapest month to fly from Washington, D.C. Reagan-National Airport to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Reagan-National 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. Reagan-National Airport to St. Louis is August, where tickets cost $275 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $449 and $442 respectively.

Can I save money by flying with a layover from Washington, D.C. Reagan-National Airport to St. Louis?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $348 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Reagan-National Airport to St. Louis, 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 Washington, D.C. Reagan-National Airport to St. Louis, you should book around 4 weeks before departure, which saves you about 58% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Expert advice

Expert advice for your flight from Reagan-National to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Ramsey Qubein

Ramsey Qubein

Expert on DCA

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Low seasonJanuary
Cheapest flight$119
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Reagan Washington National Airport to St. Louis

When to book flights from Reagan-National to St. Louis

Are your dates flexible? Find out the best times to travel from Reagan-National 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 Reagan Washington National Airport to St. Louis flights

  • What is the cheapest flight from Washington, D.C. Reagan-National Airport to St. Louis?

    In the last 7 days, the lowest price for a flight from Washington, D.C. Reagan-National Airport to St. Louis was $119 for a one-way ticket and $269 for a round-trip.

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

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

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

    American Airlines, JetBlue, Alaska Airlines, Delta, and Hawaiian Airlines offer inflight Wi-Fi service on the Reagan Washington National Airport to St. Louis flight route.

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

    The Canadair (Bombardier) Regional Jet 900 is the aircraft model that flies most regularly on the Reagan Washington National Airport to St. Louis flight route.

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

    oneworld is the only airline alliance operating flights between Reagan Washington National Airport and St. Louis.

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

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

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

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to St. Louis are Southwest and American Airlines. With an average price for the route of $373 and an overall rating of 7.9, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $353 and an overall rating of 7.1.

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

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Reagan Washington National 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 Reagan Washington National 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 Reagan Washington National 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 Reagan Washington National Airport with another airline. Booking your flights between Reagan Washington National 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 Reagan Washington National 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 Reagan Washington National Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Reagan-National Airport to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $157 or less one-way and $314 or less round-trip.

Prefer to fly direct from Reagan Washington National Airport to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Reagan-National to Lambert-St Louis.
Find which airlines fly direct from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Reagan-National to Lambert-St Louis

Monday

American Airlines,Southwest

American Airlines,Southwest

Tuesday

American Airlines,Southwest

American Airlines,Southwest

Wednesday

American Airlines,Southwest

American Airlines,Southwest

Thursday

American Airlines,Southwest

American Airlines,Southwest

Friday

American Airlines,Southwest

American Airlines,Southwest

Saturday

American Airlines,Southwest

American Airlines,Southwest

Sunday

American Airlines,Southwest

American Airlines,Southwest

See more direct flights

Direct returns

Lambert-St Louis to Washington, D.C. Reagan-National

Monday

American Airlines,Southwest

American Airlines,Southwest

Tuesday

American Airlines,Southwest

American Airlines,Southwest

Wednesday

American Airlines,Southwest

American Airlines,Southwest

Thursday

American Airlines,Southwest

American Airlines,Southwest

Friday

American Airlines,Southwest

American Airlines,Southwest

Saturday

American Airlines,Southwest

American Airlines,Southwest

Sunday

American Airlines,Southwest

American Airlines,Southwest

See more direct flights

Reviews of the top airlines flying from Reagan-National 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 Reagan-National 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.
7.9
SouthwestOverall score based on 4268 reviews
7.0Food
8.0Comfort
7.5Entertainment
8.6Crew
8.1Boarding
Airline reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

4.0 OkayAnonymous, May 2026
MDW - LAX
Read more Southwest reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

I'm glad it wasn't only 75% full because I could get a good seat

if I was good. Not happy that I have to pay extra money to get the seat I need for lake room, but I guess that’s a sign of the times.

Seats were very comfortable. They tilted back. Drinks and snacks were free and served 3 times. Attendants were awesome.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Truly terrible. Will never willingly fly southwest again. Seats are worse than before they switched to assigned seating. One flight attendant was the opposite of helpful (rude, unhelpful, dismissive, and as my stranger seatmate said unprompted: a total prick). This caused me, 15 minutes into the flight, to book an alternate return flight home on a competing airline (first class 1.2k purchase instead of my existing planned flight) just so I would not have to ever be on that aircraft, with that terrible service person, with those horrific seats ever again.

Overall a good experience, however Wifi was not working on the flight.

THe flight was an hour late. You got us on the plan and we sat on the ground for 45 minutes with no information from the pilot whatsoever. Worst flight this year.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Incoming flight was delayed, delaying boarding. It then took 30 mins to take off. Took 20 mins to get to a gate because they changed the gate last minute, crew weren’t ready so there was no one staffed to work the jet bridge. Boarding was so disorganized as is usual with American because everyone just stands around the gate regardless of boarding group.

We called Kayak for a change due to the TSA situation in Atlanta. What we got was a canceled return flight (in error) and we had to find the mistake. Not happy with Kayak who blamed it on AA.

Delays with no explanation. It could have been handled better.

Flight delay for mechanical. Inbound arrived on time. No one said why mechanical delay.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Flight boarded, departed and landed on time. Excellent service from flight attendant in FIRST

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

Everything you need to know for your flight from Reagan-National to St. Louis

Other airlines flying from Reagan-National to St. Louis

Flights from the other most popular airlines that fly from Reagan-National to St. Louis according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.