STL - DCA

$60 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 12/13. 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
$181
Overall average: $295
Frontier
Mon 12/15Tue 1/13
STL - DCA • 2 stops
Cheapest non-stop
$217
Typical prices: $230-$406
American Airlines
Tue 12/9Wed 12/10
STL - DCA • Non-stop
Our travelers' advice
AI-generated summary based on content written by travel experts
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 $181 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 57% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 15% price drop
November
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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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

Mon, Dec 15 - Tue, Jan 13
Frontier Logo
12:07 pm - 1:06 pmSTL-DCA
23h 59m2 stops
Frontier Logo
2:00 pm - 10:04 amDCA-STL
21h 04m1 stop
$181Frontier
Find Deal
Wed, Jan 7 - Fri, Jan 9
Frontier Logo
7:43 pm - 1:06 pmSTL-DCA
16h 23m1 stop
Frontier Logo
6:00 pm - 10:02 amDCA-STL
17h 02m1 stop
$197Frontier
Find Deal
Tue, Dec 9 - Wed, Dec 10
American Airlines Logo
6:00 am - 9:13 amSTL-DCA
2h 13mnonstop
American Airlines Logo
7:50 am - 9:23 amDCA-STL
2h 33mnonstop
$217American Airlines
Find Deal
Tue, Dec 9 - Thu, Dec 11
Delta Logo
6:39 am - 11:37 amSTL-DCA
3h 58m1 stop
Delta Logo
6:02 am - 9:50 amDCA-STL
4h 48m1 stop
$237Delta
Find Deal
Tue, Dec 2 - Tue, Dec 9
American Airlines Logo
2:11 pm - 5:19 pmSTL-DCA
2h 08mnonstop
American Airlines Logo
7:50 am - 9:23 amDCA-STL
2h 33mnonstop
$240American Airlines
Find Deal
Wed, Dec 17 - Thu, Jan 1
United Airlines Logo
10:00 am - 3:38 pmSTL-DCA
4h 38m1 stop
United Airlines Logo
1:00 pm - 5:54 pmDCA-STL
5h 54m1 stop
$260United Airlines
Find Deal
Mon, Nov 24 - Tue, Dec 2
Southwest Logo
1:20 pm - 4:20 pmSTL-DCA
2h 00mnonstop
Southwest Logo
8:15 am - 9:35 amDCA-STL
2h 20mnonstop
$263Southwest
Find Deal
Fri, Dec 5 - Mon, Dec 8
United Airlines Logo
11:50 am - 7:35 pmSTL-DCA
6h 45m1 stop
United Airlines Logo
12:00 pm - 3:40 pmDCA-STL
4h 40m1 stop
$265United Airlines
Find Deal
Sat, Dec 6 - Mon, Dec 8
Southwest Logo
8:45 am - 11:40 amSTL-DCA
1h 55mnonstop
Southwest Logo
6:10 pm - 7:35 pmDCA-STL
2h 25mnonstop
$268Southwest
Find Deal
Wed, Dec 24 - Sun, Jan 4
Delta Logo
6:00 am - 11:37 amSTL-DCA
4h 37m1 stop
Delta Logo
8:11 pm - 11:42 pmDCA-STL
4h 31m1 stop
$309Delta
Find Deal
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 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 October and November, where the average cost of round-trip tickets is $356 and $324 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 $311 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 57% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Expert advice

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

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Southwest

Southwest offers free carry-on and personal item, but checked bags now incur fees.


Southwest's early boarding benefits include 34-inch legroom and premium snacks in extra legroom seats.

Read more about Southwestby Blane Bachelor
American Airlines

Consider Main Cabin Extra for early boarding and complimentary drinks; it's often not expensive.


Download the American Airlines app for inflight entertainment; seatback screens are being removed.

Airports
STL

Avoid peak hours at STL to minimize wait times. Early mornings and afternoons can be particularly crowded.

Read more about STLby Yulia Denisyuk
DCA

Use the metro line for quick access to D.C. from DCA, avoiding traffic and expensive car rides.

Read more about DCAby Ramsey Qubein
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor

Blane Bachelor

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.

Read more
Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet Baskas

Harriet Baskas

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.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on DCA

Ramsey Qubein

Ramsey Qubein

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.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

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.

Read more

Good to know

Low seasonJuly
Cheapest flight$61
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly with an average 9% increase in price.
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 $61 for a one-way ticket and $181 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, Delta, Alaska Airlines, 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 $307 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 $295 and an overall rating of 7.2.

  • 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 $168 or less one-way and $313 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 4241 reviews
7.0Food
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
Airline reviews

Plane crashed into a bus or some other vehicle on the ground while pulling out of the gate. No injuries, but wing tip was damaged and returned to gate for “maintenance issues” and we departed 5 hours later because the plane went out of service and new plane was flown in from a nearby airport, Midway.

2.0 MediocreAnonymous, Nov 2025ORD - LAS
Read more Southwest reviews

Plane crashed into a bus or some other vehicle on the ground while pulling out of the gate. No injuries, but wing tip was damaged and returned to gate for “maintenance issues” and we departed 5 hours later because the plane went out of service and new plane was flown in from a nearby airport, Midway.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

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.

Weather delay for 2.5 hours followed by half hour crew delay, did not have ginger ale, uncomfortable seats

It was nobody’s fault - but the plane came 4-hrs late and we were updated randomly in 20-30 mins increments which left us hostage to sit and wait expectantly. It was very long and got very late. Our plane didn’t land until nearly 1 am! Also the toilet wasn’t working. The hosts were nice enough but were clearly “about to pass out” as one told me. Lastly, there was no snack or even time for it. Just a bad experience overall.

The boarding crew was incredibly helpful getting me on an earlier flight

Two flight changes before the scheduled flight. On the day of the flight, the flight was delayed, which caused the connecting flight to be missed. Then, I was directed to another airport (CUN) and traveled to Tulum. American gave a $12 voucher for lunch. The least expensive item on the menu at a Mexican restaurant was $9.99. Driving to Tulum was a bad auto crash, and traffic was delayed two-plus hours. The bottom line is that we should have been at the hotel at noon, but it ended up at 11:30 PM.

Great experience. Flight boarded easily. Departed early. Smooth flight. Great arrival in DC--almost no taxing! Almost direct to gate from runway. Crew was terrific. Same cookies and beverages in main cabin. I did not use the entertainment system on this flight.

Flight delayed on both ends - have a gate ready at DCA, don't make us sit for 30min after being late to take off as well.

AA can't control the weather. But the airplane was hot and stuffy while stuck on the runway with a broken entertainment system.

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

There was no one at the counter to assist with our check in. The app didn’t work, so I arrived at the airport with time to check in and I couldn’t because no employees were there. When I finally got someone on the phone, it was inside the 60min rule and they said I could no longer check in and they could sell me another ticket. We had to scramble and pay an additional $800 for tickets and THEN AFTER (about 60 min from my original convo with customer service and 10min after original departure time) I had boarded my new flight, there was email saying my original flight from Frontier was delayed and leaving 2hr 50min later, but I STILL wouldn’t have been able to check in. Which means customer service should have been able to see it and let me check in because I was well within my check in time. When I call Frontier, they hang up on me. So their app didn’t work and they employees left and they take zero responsibility or assistance with their “customer service”

Terrible. Flight cancelled with no reasoning and no flights to rebook. Employees were useless and did nothing to help. Did not even know where to retrieve luggage from the cancelled flight. Flyers beware.

No fault of Frontier staff: plane was very late, reached Orlando at 1 am, took a while to get luggage. Weather, gov financial shutdown impact on TSA, air controllers seemed to have multiple flights backed up. Frontier staff seemed to cope as gracefully as possible. It did reassure me that I and my new hip could adapt to travel challenges. Food/entertainment were irrelevant to my trip.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

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

Information on your arrival and departure airports