STL - DCA

$76 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 4/17. 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
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$237
Typical prices: $379-$239
Southwest
Wed 5/13Sat 5/16
STL - DCA • 2 stops
Cheapest non-stop
$240
Typical prices: $429-$229
American Airlines
Mon 5/18Wed 5/20
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
Cheapest • from $237 (round-trip)
Best reviews • 8.0 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 02m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $222 (round-trip)
Shortest trip • 3h 59m (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 54% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+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 Reagan-National!
Flight Deals
Booking Insights
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

Wed, May 13 - Sat, May 16
Southwest Logo
2:10 pm - 10:25 pm
STL
-
DCA
7h 15m
2 stops
Southwest Logo
6:25 pm - 7:50 pm
DCA
-
STL
2h 25mnonstop
$237Southwest
Mon, May 18 - Wed, May 20
American Airlines Logo
6:00 am - 9:15 am
STL
-
DCA
2h 15mnonstop
American Airlines Logo
8:41 pm - 10:07 pm
DCA
-
STL
2h 26mnonstop
$240American Airlines
Mon, May 18 - Wed, May 20
Southwest Logo
4:40 pm - 10:55 pm
STL
-
DCA
5h 15m
1 stop
Southwest Logo
9:55 am - 3:05 pm
DCA
-
STL
6h 10m
1 stop
$242Southwest
Sat, Apr 18 - Mon, Apr 20
Southwest Logo
12:05 pm - 3:05 pm
STL
-
DCA
2h 00mnonstop
Southwest Logo
8:00 am - 9:20 am
DCA
-
STL
2h 20mnonstop
$243Southwest
Mon, May 18 - Wed, May 20
American Airlines Logo
6:00 am - 9:15 am
STL
-
DCA
2h 15mnonstop
American Airlines Logo
8:41 pm - 10:07 pm
DCA
-
STL
2h 26mnonstop
$244American Airlines
Fri, May 29 - Fri, Jun 5
Frontier Logo
8:08 pm - 9:58 pm
STL
-
DCA
24h 50m
1 stop
Frontier Logo
6:00 pm - 7:23 pm
DCA
-
STL
26h 23m
1 stop
$246Frontier
Wed, May 13 - Thu, May 14
Southwest Logo
2:10 pm - 10:25 pm
STL
-
DCA
7h 15m
2 stops
Southwest Logo
6:55 am - 1:45 pm
DCA
-
STL
7h 50m
1 stop
$247Southwest
Sat, May 2 - Tue, May 5
Southwest Logo
5:15 am - 2:00 pm
STL
-
DCA
7h 45m
2 stops
Southwest Logo
10:55 am - 5:55 pm
DCA
-
STL
8h 00m
1 stop
$248Southwest
Fri, Apr 24 - Fri, May 1
Frontier Logo
9:58 pm - 9:59 pm
STL
-
DCA
23h 01m
2 stops
Frontier Logo
1:59 pm - 7:32 pm
DCA
-
STL
30h 33m
1 stop
$249Frontier
Fri, Jun 26 - Tue, Jun 30
Frontier Logo
8:08 pm - 12:57 pm
STL
-
DCA
15h 49m
1 stop
Frontier Logo
7:00 am - 7:23 pm
DCA
-
STL
13h 23m
1 stop
$250Frontier
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.

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

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

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 Tuesdays 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 $388 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 $338 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 54% 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$76
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 10% 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 $76 for a one-way ticket and $237 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 $327 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 $300 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 $304 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 4331 reviews
7.0Food
8.0Comfort
8.6Crew
8.1Boarding
7.5Entertainment
Airline reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

2.0 MediocreStuart, Mar 2026
HOU - STL
Read more Southwest reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

Great flight. Good snacks and drinks. Grateful it was free. The flight from Nashville to louisville, i think her name was Tracy (not sure that's right) super awesome, nice and cheerful. She really enjoyed being at work today! She was the person who scanned the boarding pass on flight wn941. She should be recommended for a raise !

I liked it better when you were truer to your roots Am paying more for less fun

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

I was supposed to be on a later flight. When I showed up at the gate, the woman working there was extremely helpful getting moved up to this earlier flight.

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

It was great. Smooth flight, comfortable, left on time and landed on time.

Horrible experience upon landing. Probably more due to DCA utter incompetence than AA.

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Poor communication ahead of time about flight delays and old planes/other equipment.

Never going to fly your airline again if it can be avoided.

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

Other than nearly three hour delay for maintenance issues, everything went smooth

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.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

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!

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

Information on your arrival and departure airports