STL - DCA

$71 Find Cheap Flights from St. Louis to Reagan Washington National Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Reagan-National departing on 5/8. 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 Washington, D.C. Reagan-National Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Washington, D.C., 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 Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$245
Overall average: $387
Frontier
Sat 3/21Tue 3/24
STL - DCA • 1 stop
Cheapest non-stop
$255
Typical prices: $257-$449
American Airlines
Wed 4/15Sat 4/18
STL - DCA • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Southwest's two free checked bags offer great value.
Use the metro line for quick access from DCA to D.C.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $245 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with American Airlines and Southwest. Average duration is 2h 02m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Denver (DEN)
Cheapest • Avg $222 (round-trip)
Detroit (DTW)
Shortest trip • 3h 59m (one-way)
Insights
Insights
Insights
Insights
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 55% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 25% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Reagan-National!
Flight Deals
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Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Reagan-National 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 St. Louis to Reagan-National

Sat, Mar 21 - Tue, Mar 24
Frontier Logo
8:12 pm - 1:02 pm
STL
-
DCA
15h 50m
1 stop
Frontier Logo
8:00 am - 9:49 am
DCA
-
STL
26h 49m
1 stop
$245Frontier
Wed, Mar 25 - Tue, Mar 31
Southwest Logo
1:20 pm - 4:20 pm
STL
-
DCA
2h 00mnonstop
Southwest Logo
1:00 pm - 7:55 pm
DCA
-
STL
7h 55m
2 stops
$250Southwest
Fri, Apr 10 - Sat, Apr 18
Frontier Logo
8:16 pm - 12:02 pm
STL
-
DCA
14h 46m
1 stop
Frontier Logo
6:00 pm - 6:50 am
DCA
-
STL
37h 50m
2 stops
$251Frontier
Fri, Apr 10 - Sun, Apr 12
Frontier Logo
8:16 pm - 12:02 pm
STL
-
DCA
14h 46m
1 stop
Frontier Logo
7:00 am - 9:48 am
DCA
-
STL
27h 48m
1 stop
$253Frontier
Wed, Apr 15 - Sat, Apr 18
American Airlines Logo
3:43 pm - 6:58 pm
STL
-
DCA
2h 15mnonstop
American Airlines Logo
7:59 pm - 9:25 pm
DCA
-
STL
2h 26mnonstop
$255American Airlines
Fri, May 1 - Mon, May 4
Frontier Logo
8:06 pm - 1:00 pm
STL
-
DCA
15h 54m
1 stop
Frontier Logo
8:00 am - 7:32 pm
DCA
-
STL
12h 32m
1 stop
$258Frontier
Thu, May 7 - Sun, May 10
Frontier Logo
8:12 pm - 4:59 pm
STL
-
DCA
19h 47m
1 stop
Frontier Logo
7:00 am - 7:12 pm
DCA
-
STL
13h 12m
1 stop
$259Frontier
Wed, Mar 25 - Tue, Mar 31
Southwest Logo
8:25 am - 3:05 pm
STL
-
DCA
5h 40m
1 stop
Southwest Logo
11:40 am - 5:55 pm
DCA
-
STL
7h 15m
2 stops
$260Southwest
Mon, Mar 30 - Fri, Apr 3
American Airlines Logo
6:00 am - 9:12 am
STL
-
DCA
2h 12mnonstop
American Airlines Logo
7:59 pm - 9:34 pm
DCA
-
STL
2h 35mnonstop
$261American Airlines
Tue, Apr 7 - Tue, Apr 21
American Airlines Logo
3:43 pm - 6:58 pm
STL
-
DCA
2h 15mnonstop
American Airlines Logo
8:41 pm - 10:07 pm
DCA
-
STL
2h 26mnonstop
$263American Airlines
Booking Insights

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

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

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

When flying from St. Louis to Reagan Washington National Airport, you should consider leaving on a Saturday and avoid Sundays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Saturdays and the most expensive ones on Sundays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Washington, D.C. Reagan-National Airport, 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 Washington, D.C. Reagan-National Airport is August, where tickets cost $253 (return) on average. On the other hand, the most expensive months are February and March, where the average cost of round-trip tickets is $590 and $387 respectively.

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

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 $350 on average.

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

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 Washington, D.C. Reagan-National Airport, 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 Washington, D.C. Reagan-National Airport, you should book around 4 weeks before departure, which saves you about 55% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 18 weeks before departure.

Expert advice

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

 
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$71
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 12% lower on average.
Flight from St. Louis to Reagan Washington National Airport

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

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

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

    In the last 3 days, the lowest price for a flight from St. Louis to Washington, D.C. Reagan-National Airport was $71 for a one-way ticket and $245 for a round-trip.

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

    A passport is not required to fly from St. Louis to Reagan Washington National Airport.

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

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

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the St. Louis to Reagan Washington National Airport flight route.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Washington, D.C. are Southwest and American Airlines. With an average price for the route of $324 and an overall rating of 8.0, Southwest is the most popular choice. American Airlines is also a great choice for the route, with an average price of $297 and an overall rating of 7.1.

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

    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 Reagan Washington National Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Reagan Washington National Airport 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 Reagan Washington National Airport?

    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 Reagan Washington National Airport with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and DCA 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 Reagan Washington National Airport?

    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 Reagan Washington National Airport from St. Louis 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 St. Louis to Washington, D.C. Reagan-National Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $175 or less one-way and $297 or less round-trip.

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

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

Direct departures

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

Direct returns

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

Reviews of the top 3 airlines serving from St. Louis to Reagan-National

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Washington, D.C.. 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 Reagan-National? 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
SouthwestOverall score based on 4311 reviews
8.0Comfort
8.1Boarding
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

Snacks are always pretzels. Why can't you also offer peanuts ?

6.0 GoodAnonymous, Mar 2026
STL - HOU
Read more Southwest reviews

Snacks are always pretzels. Why can't you also offer peanuts ?

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The last 3 flights between BWI and BDL canceled the beverage service mid- way. Just say up front that the fight is too short. Thanks!

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

The Southwest experience has definitely taken a dive from its early days. You can no longer deferentiate from other airlines. Air travel is too expensive. Southwest is no longer budget friendly. They have lost me as a loyal customer.

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

An entire day of delays. Cost lots of money. Meals and a hotel.

The WiFi and crew on the plane were good, however, the boarding experience was awful. I paid for the Choice Preferred and was boarded in group 5 so all overhead storage was full. They found room for our luggage, but further back making getting off the plane a nightmare. Also, we were in row 6 and the seats were extremely uncomfortable. Both my daughter and I had no leg room and couldn’t wait to get off the plane.

Snow delayed boarding several times, which I understand happens. Issue I had was that after we did board, pilot told us we were going to roll out to be de-iced, then on our way. We were de-iced once, taxied to the tarmac and then stopped. Sat for another 30 minutes or so, the another de-icing. Then we rolled out to a parking spot, only to sit for another hour due to a traffic stop in DCA, which I'm confident they knew would happen before we boarded. Pilot gave no updates other than we had to hold, attendants did speak to the crew, but when asked, said the pilot would be updating us. We on the ground in the plane waiting for over 2 hours. They did communicate that bathrooms would be open, but no other news until we left. Would have been better to be up front about status.

Flight was delayed. Not much information on when the flight would take off. Eventually we were told it was maintenance. App was not giving updates.

Flight was on time and there was an empty seat next to me. That makes for a good flight!

Maintenance took a very long time and then we were in a holding pattern. While a one-off maintenance issue is standard, there were delays on both of my flights for this trip based on maintenance issues with the planes, which delayed both flights over 45 minutes. Thankfully, I didn't have any connections but it wasn't an experience that would make me pick AA if I have other options.

Everything was good. Flight was very full so crew was busy. After we boarded and plane pulled away from the gate, we were delayed about 40 minutes- sitting on the runway - due to weather en route or at the destination. While weather is not the fault of the airline- it’s terrible to sit on a plane and not moving.

The flight was on time/early, attentive crew, and everything overall went smoothly. Disappointed that WIFI was not working for the flight.

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

Initial flight was cancelled at the time of arrival to the airport, flight alternative requires switching from direct to flight with a layover, and the plane felt like it would split apart, it was so rattle-y.

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

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

Information on your arrival and departure airports