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$85 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 7/9. 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
Sat 6/22
Sat 6/29

Search hundreds of travel sites at once for deals on flights to Reagan Washington 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
In the last 7 days travelers have searched 43,800,826 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 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 and deals for you by selecting your travel dates.
Choose your dates
5:42 pm - 8:43 pmSTL-DCA
2h 01mnonstop
8:00 pm - 9:28 pmDCA-STL
2h 28mnonstop
$169American Airlines
Find Deal
Wed, Jun 12 - Tue, Jun 18
8:55 am - 11:59 amSTL-DCA
2h 04mnonstop
1:44 pm - 3:21 pmDCA-STL
2h 37mnonstop
$184American Airlines
Find Deal
Wed, Oct 30 - Sat, Nov 2
1:10 pm - 8:56 pmSTL-DCA
6h 46m1 stop
6:30 pm - 11:43 pmDCA-STL
6h 13m1 stop
$188Delta
Find Deal
Tue, Jun 11 - Wed, Jun 19
10:44 pm - 12:01 pmSTL-DCA
12h 17m1 stop
7:00 am - 9:29 amDCA-STL
27h 29m1 stop
$203Frontier
Find Deal
Tue, Jun 4 - Tue, Jun 11
8:02 pm - 9:57 pmSTL-DCA
24h 55m1 stop
7:00 am - 9:29 amDCA-STL
27h 29m1 stop
$204Frontier
Find Deal
Wed, Jun 5 - Tue, Jun 11
2:16 pm - 7:39 pmSTL-DCA
4h 23m1 stop
8:45 am - 2:30 pmDCA-STL
6h 45m1 stop
$208Delta
Find Deal
Wed, Jun 12 - Tue, Jun 18
6:08 am - 1:21 pmSTL-DCA
6h 13m1 stop
12:00 pm - 5:12 pmDCA-STL
6h 12m1 stop
$276United Airlines
Find Deal
Sun, Jun 30 - Thu, Jul 4
6:08 am - 11:58 amSTL-DCA
4h 50m1 stop
8:30 am - 2:14 pmDCA-STL
6h 44m1 stop
$278United Airlines
Find Deal
Thu, Jun 13 - Tue, Jun 18
6:09 am - 9:11 amSTL-DCA
2h 02mnonstop
3:26 pm - 4:51 pmDCA-STL
2h 25mnonstop
$532Undisclosed Carrier
Find Deal
Sat, Jun 15 - Mon, Jun 17
6:09 am - 9:11 amSTL-DCA
2h 02mnonstop
9:50 am - 2:26 pmDCA-STL
5h 36m1 stop
$542Undisclosed Carrier
Find Deal
Sat, Jun 15 - Mon, Jun 17

Flights from St. Louis to Reagan-National - Travel Insights & Trends

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 flights from St. Louis to Washington, D.C. Reagan-National Airport clicked on KAYAK for each day over the last 12 months.
For St. Louis to Reagan Washington National Airport, Saturday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Reagan Washington National Airport back to St. Louis, the best deals are generally found on Tuesday, with Sunday being the most expensive.

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 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 February, where tickets cost $253 on average. On the other hand, the most expensive months are September and November, where the average cost of tickets is $339 and $334 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from St. Louis to Washington, D.C. Reagan-National Airport, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 68 days before departure.

Which airlines provide the cheapest flights from St. Louis to Reagan Washington National Airport?

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 ($85) and Delta ($94). The cheapest round-trip tickets were found on American Airlines ($169) and Delta ($188).

Which airlines fly non-stop between St. Louis and Washington, D.C. Reagan-National Airport?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from St. Louis to Washington, D.C. Reagan-National Airport.
There are 2 airlines that fly nonstop from St. Louis to Washington, D.C. Reagan-National Airport. They are American Airlines and Southwest. The cheapest airline for this route is American Airlines, with the best one-way deal found costing $191. On average, the best prices for this route can be found at American Airlines.

How many flights are there between St. Louis and Washington, D.C. Reagan-National Airport per day?

Each day, there are between 9 and 14 nonstop flights that take off from St. Louis and land in Washington, D.C. Reagan-National Airport, with an average flight time of 2h 01m. The most common departure time is 8:00 am and most flights take off in the morning. Each week, there are 83 flights. The most frequent day of departure is Monday, when 17% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between St. Louis and Washington, D.C. Reagan-National Airport?

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 St. Louis to Reagan Washington National Airport take?

The average nonstop flight takes 1h 56m, covering a distance of 717 miles.

What’s the earliest departure time from St. Louis to Reagan Washington National Airport?

Early birds can take the earliest flight from St. Louis at 6:09 am and will be landing in Washington, D.C. Reagan-National Airport at 9:11 am.

What’s the latest departure time from St. Louis to Reagan Washington National Airport?

If you prefer to fly at night, the latest flight from St. Louis to Washington, D.C. Reagan-National Airport jets off at 7:20 pm and lands at 10:15 pm.

Good to know

Low season

January

High season

May

Cheapest flight

$85
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 4% 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 $85 for a one-way ticket and $169 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, Alaska Airlines, JetBlue, 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 Airbus A319 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., Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Washington, D.C. are Delta and United Airlines. With an average price for the route of $276 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 $337 and an overall rating of 7.4.

  • 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.

See more FAQs

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 $155 or less one-way and $253 or less round-trip.

Prefer to fly non-stop from St. Louis to Reagan Washington National Airport?

Find which airlines fly direct from Lambert-St Louis to Reagan-National, which days they fly and book direct flights.

Nonstop 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

Nonstop 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
See more direct flights

Top 4 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
DeltaOverall score based on 10561 reviews
8.6Crew
7.9Comfort
8.2Boarding
7.4Food
8.0Entertainment
Airline reviews

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

2.0 MediocreNairan, May 2024JFK - FLL
Read more about Delta reviews

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

Our flight to Zurich was delayed by almost 3 hours, so we missed our next flight. There was no indication it would be delayed this much. We were told the gate had changed and then it apparently took over 2 hours to load the "catering" on the plane. We were not compensated in any way for the trouble.

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

The 1st class male crew member was very pleasant - the short female with round glasses , maybe in 50’s had no personality- never spoke when delivering my food, drink, & never smiled the whole trip! In fact looked annoyed when the boarding proses was happening- I would never hire this woman - unfriendly . Have never dealt with a crew member like her-

5-hour delay due to storms in Tanoa and airspace restricted by Miami traffic controllers.

All flights were on time and boarding was issue free

Water service would be great. The way they board is terrible. Slow passengers first😂😂 They need to smart up a bit

It got me where I needed it to; not much more. It had no competition so that was why I chose it.

Plane didn’t even make it off the ground. We all had to get off and walk to a different terminal (lots of confusion) to get on a different plane. Landed fairly late, connections missed.

Crowded flight, but upbeat and kind crew. Pilot greeted us at door, flight attendant thanked a number of “special” passengers for their business, another addressed an eight-year old boy as “young man.” United obviously trying to up their game, but though all of that is nice and notable, flying still feels like moving along a human assembly line, being herded into one small space after another (boarding areas with too few seats, planes with limited personal space, shuttles (IAD) packed too full.

It was ok until we got to DC and I wanted to use my United Club pass and the snobbish receptionist said that they don’t take one pass. It took me everything itch of patience not to tell her off

Food choice was poor and we had to buy on board snacks.

We were offer chocolate cookies , not everyone eat chocolate. Thank you

Onboarding - it would be great to see on the screen what group they were boarding. It was very confusing on who was boarding (even though they called it out) they were not clear and the space to board was strange.

Lost luggage again. Our second trip to Mykonos, and 2nd time no luggage.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

The flight was great until towards the end when the flight attendant read an excessively long commercial for purchasing an american airlines credit card. The worst part is that we are doing a lot of traveling this year so i was actually interested in getting the credit card, but I was so annoyed with the long commercial that I completely dismissed the flight attendant bringing around the information. Next time, keep the sales pitch to 10 seconds and then pass around the brochures!!

Nice aircraft. Plane was PACKED full and distance between seats was tight. Had it been more than a two hour flight it would not have been tolerable. I had much more knee space on the JetBlue flight I went out on.

New ridiculous policy by american destroyed my allegiance to american. As a million miler with american, I expected it would be easy to get on an earlier flight when I got to airport earlier than expected, and save a five hour layover. WRONG. The online app would not let me switch flights, So I called, and was promised a call back in 90 minutes. HAH! The customer service desk at DCA said “we no longer have access to changing a flight on our screens. If the app couldn’t do it, I should send a letter to American, but there’s nothing else possible!”

I am tired of being nickel and dimed for seat location, checked luggage and carry on bags. That is why i rarely fly anymore.

It was right on time and crew were very courteous

Great flight. Boarding was efficient and quick. On time departure and smooth flight. Flight arrived early at destination. Good experience.

Literally the worst experience ever and I had my service dog with me. Flight was supposed to leave at 1:51 PM but the plane arrived late. They boarded us around 3 PM and kept us on the plane for an hour saying that due to weather conditions in Miami, we could not takeoff yet. After waiting for an hour, they deplaned. And then they will not give us our bags back that we could just leave and schedule for another flight. Every hour they kept updating saying we have to wait another hour without any explanation as to what was going on. Eventually, I went to customer service to change my ticket, but by the time I made it to the front of the line, they started boarding my flight again. And then when we got onto the flight, they said there were two flight attendants That were past their shift. They kept us on the plane for about another 40 minutes until they told us they had no other flight attendance and had to deplane again. Then I gave us hotel vouchers and told us we would be on a flight at 6 AM the next day. At this point it is about 9 PM. I get to the hotel with my dog, who hasn’t been able to go potty for about eight hours. When I arrived at the hotel, I got a text alert saying my flight has been canceled at 6 AM and they moved past to 5 AM, however the hotel shuttle doesn’t leave early enough to make it to the airport for 5 AM flight. So me and some other passengers got a cab after about three hours of sleep to get back to the airport. This was the worst experience ever.

Their computers were down upon arrival to the airport. They were unable to figure out how to board us. We were delayed over an hour and a half.

Delay. Flight was delayed in Washington.knew that connection was impossible as not enough time to switch terminals. The steward would not let me stay the night. So forced to Dallas.late night, after 10pm.hotel checkin was one hour. Passengers lined up only one girl to checkin at comfort inn. No food availability at that time. Had to leave early at 6:30 am to catch a flight at 8:45. Stressfull.

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Good for the price. My only complaint is that the pilot should keep the air flowing while passengers are waiting to getting out of airplane.

Plane could have been more on time. More leg room .

I arrived 1 hour prior to boarding, and they said I was too late for a domestic flight. First time I heard that :-(

Check in online was easy. Seats aren’t very comfortable

Fecal matter in seat back pocket. Presumably from a kids diaper.

Worst airline to travel with. They treat you like a prisoner in a jailhouse barking out orders and threats. Nickle and dime you to the same price or higher than a respectable airline like one of the big 3 . Might as well fly with standard airlines

Well I mean u get what u pay for so 🤷‍♂️

Over an hour delay in departure but I was notified beforehand. Another delay on tarmac upon arrival at LGA. We ended up departing the plane almost 2 hours later than expected

I fly Frontier because it’s affordable. I understand that the seats are tight and not the most comfortable…but that’s part of it. The problem with this flight was that there was a group of travelers directly behind me at the back of the plane who were ridiculously loud and obnoxious the entire flight. I’m pretty sure they were drunk and I could periodically smell an odd odor that I believe was one of them using a smokeless vape pen. The stewards had to remind them to keep quiet during the pre-flight instruction, but that was it. They never said another thing to them for the rest of the flight. It was a miserable.

Book cheap flights from St. Louis to Washington, D.C.

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Washington, D.C. found on KAYAK in the last 72 hours.
7/9Tue
nonstopAmerican Airlines
2h 00mSTL-DCA
$85
7/9Tue
1 stopDelta
4h 51mSTL-DCA
$94
9/19Thu
nonstopAmerican Airlines
2h 05mSTL-DCA
$100
6/5Wed
1 stopFrontier
15h 03mSTL-DCA
$109
6/21Fri
1 stopDelta
5h 19mSTL-DCA
$114
6/3Mon
1 stopFrontier
14h 59mSTL-DCA
$115
9/19Thu
1 stopUnited Airlines
6h 52mSTL-DCA
$132
7/28Sun
1 stopUnited Airlines
4h 50mSTL-DCA
$138
6/4Tue
nonstopSouthwest
2h 00mSTL-DCA
$168
6/4Tue
1 stopSouthwest
6h 00mSTL-DCA
$177

Search by stops

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Last minute flights from St. Louis to Reagan-National

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 St. Louis to Washington, D.C. that are departing in the next 10 days.
5/28Tue
multi-stopFrontier
18h 23mSTL-DCA
5/31Fri
multi-stopFrontier
15h 28mDCA-STL
$276
5/26Sun
multi-stopAmerican Airlines
4h 16mSTL-DCA
5/26Sun
nonstopAmerican Airlines
2h 16mDCA-STL
$332
5/25Sat
multi-stopFrontier
24h 55mSTL-DCA
5/29Wed
multi-stopFrontier
28h 09mDCA-STL
$334
5/24Fri
multi-stopFrontier
20h 22mSTL-DCA
5/29Wed
multi-stopFrontier
28h 09mDCA-STL
$337
5/27Mon
multi-stopFrontier
14h 59mSTL-DCA
6/3Mon
multi-stopFrontier
19h 12mDCA-STL
$341
5/25Sat
nonstopAmerican Airlines
2h 10mSTL-DCA
5/29Wed
nonstopAmerican Airlines
2h 15mDCA-STL
$494
5/28Tue
multi-stopDelta
4h 27mSTL-DCA
5/30Thu
multi-stopDelta
4h 09mDCA-STL
$513
5/27Mon
multi-stopDelta
4h 36mSTL-DCA
5/29Wed
multi-stopDelta
4h 03mDCA-STL
$531
5/26Sun
multi-stopUnited Airlines
7h 14mSTL-DCA
5/26Sun
multi-stopUnited Airlines
5h 29mDCA-STL
$585
5/26Sun
multi-stopUnited Airlines
5h 53mSTL-DCA
5/27Mon
multi-stopUnited Airlines
4h 41mDCA-STL
$590

Search by stops

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St. Louis - Reagan Washington National Airport Flights

Departure:

St. Louis (STL)United States

Destination:

Reagan Washington National Airport (DCA)United States

Return flight deals:

Reagan Washington National Airport - St. Louis

Cabin classes:

$653
$839
$1,216
$198