Cheap Flights from St. Louis to Washington D.C.
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Flights from St. Louis to Washington D.C.
Flight deals from St. Louis to Washington D.C.
We've found these cheap flights for you. You can book one-way or return flight tickets.
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Round-trip
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One way
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Cheapest nonstop
STL 15:452hDirectDCA 18:45St. Louis - Washington D.C. | Fri, Jul 4 | Southwest Airlines
DCA 08:152h 15mDirectSTL 09:30Washington D.C. - St. Louis | Sun, Jul 6 | Southwest Airlines£146 £19425% OFF25% OFF£194 £146 -
STL 19:202hDirectDCA 22:20St. Louis - Washington D.C. | Fri, Jun 27 | Southwest Airlines
DCA 08:002h 10mDirectSTL 09:10Washington D.C. - St. Louis | Mon, Jun 30 | Southwest Airlines£147 £19424% OFF24% OFF£194 £147
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STL 17:3518h 9m1 stopsIAD 12:44St. Louis - Washington D.C. | Wed, Jun 11 | Frontier Airlines
IAD 06:108h 30m1 stopsSTL 13:40Washington D.C. - St. Louis | Sun, Jun 15 | Frontier Airlines£135 £19431% OFF31% OFF£194 £135 -
STL 13:304h 4m1 stopsDCA 18:34St. Louis - Washington D.C. | Wed, Jul 2 | Delta Air Lines
DCA 06:004h 41m1 stopsSTL 09:41Washington D.C. - St. Louis | Wed, Jul 9 | Delta Air Lines£13630% OFF£194 £136 -
STL 07:006h 42m1 stopsIAD 14:42St. Louis - Washington D.C. | Tue, Jul 22 | Delta Air Lines
DCA 19:395h 14m1 stopsSTL 23:53Washington D.C. - St. Louis | Tue, Jul 22 | Delta Air Lines£13630% OFF£194 £136
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STL 18:043h 51m1 stopsIAD 22:55St. Louis - Washington D.C. | Fri, Jul 18 | Delta Air Lines
DCA 06:004h 41m1 stopsSTL 09:41Washington D.C. - St. Louis | Thu, Jul 24 | Delta Air Lines£13728% OFF£194 £137
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STL 15:426h 3m1 stopsDCA 22:45St. Louis - Washington D.C. | Sat, Jun 14 | Delta Air Lines
DCA 18:306h 21m1 stopsSTL 23:51Washington D.C. - St. Louis | Sat, Jun 21 | Delta Air Lines£13828% OFF£194 £138
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STL 16:104h 36m1 stopsDCA 21:46St. Louis - Washington D.C. | Mon, Jun 30 | Delta Air Lines
DCA 06:004h 15m1 stopsSTL 09:15Washington D.C. - St. Louis | Tue, Jul 1 | Delta Air Lines£13928% OFF£194 £139
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STL 06:403h 53m1 stopsIAD 11:33St. Louis - Washington D.C. | Sat, Jul 5 | Delta Air Lines
IAD 06:004h 41m1 stopsSTL 09:41Washington D.C. - St. Louis | Thu, Jul 10 | Delta Air Lines£14227% OFF£194 £142
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STL 06:005h 41m1 stopsDCA 12:41St. Louis - Washington D.C. | Thu, Jul 24 | Delta Air Lines
DCA 19:355h 18m1 stopsSTL 23:53Washington D.C. - St. Louis | Fri, Jul 25 | Delta Air Lines£14426% OFF£194 £144
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STL 13:0017h 25m1 stopsWAS Invalid DateSt. Louis - Washington D.C. | Wed, Jun 11 | Normal Airline
WAS 15:006hDirectSTL 16:00Washington D.C. - St. Louis | Fri, Jun 13 | Normal AirlineFind More FlightsFind More Flights
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Cheapest nonstop
STL 17:472h 1mDirectDCA 20:48St. Louis - Washington D.C. | Wed, Jul 2 | American Airlines£51 £18673% OFF73% OFF£186 £51 -
STL 13:102hDirectDCA 16:10St. Louis - Washington D.C. | Sat, Jul 5 | Southwest Airlines£67 £18664% OFF64% OFF£186 £67
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STL 06:002h 5mDirectDCA 09:05St. Louis - Washington D.C. | Tue, Jul 1 | American Airlines£68 £18663% OFF63% OFF£186 £68
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STL 06:002h 10mDirectDCA 09:10St. Louis - Washington D.C. | Sat, Aug 2 | American Airlines£7957% OFF£186 £79
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STL 06:005h 48m1 stopsIAD 12:48St. Louis - Washington D.C. | Sat, Jul 5 | Delta Air Lines£6963% OFF£186 £69
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STL 07:004h 45m1 stopsDCA 12:45St. Louis - Washington D.C. | Tue, Jul 1 | Delta Air Lines£7063% OFF£186 £70
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STL 17:234h 51m1 stopsIAD 23:14St. Louis - Washington D.C. | Fri, Jul 4 | Delta Air Lines£7063% OFF£186 £70
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STL 17:234h 19m1 stopsDCA 22:42St. Louis - Washington D.C. | Mon, Jul 21 | Delta Air Lines£7261% OFF£186 £72
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STL 13:307h 16m1 stopsDCA 21:46St. Louis - Washington D.C. | Wed, Jul 2 | Delta Air Lines£7857% OFF£186 £78
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STL 14:527h 24m1 stopsIAD 23:16St. Louis - Washington D.C. | Sat, Jun 14 | Frontier Airlines£14224% OFF£186 £142
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STL 13:0017h 25m1 stopsWAS Invalid DateSt. Louis - Washington D.C. | Wed, Jun 11 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
Flight Information from St. Louis to Washington D.C.
| Cheapest one-way flight price | £50 |
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| Cheapest return ticket price | £139 |
| Off-season travel month | April |
| Peak season for travel | June |
| Flight distance | 1,139.76km |
| Average flight time | 2 hours 30 minutes |
| Popular airline | American Airlines |
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Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
FAQ
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When are flight tickets from St. Louis (STL) to Washington D.C. (WAS) the cheapest?
Airlines adjust prices for flights from St. Louis to Washington D.C. based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays. -
How much are flights from St. Louis (STL) to Washington D.C. (WAS) cost?
According to Trip.com's data, the lowest price is around £278. -
How long is the flight from St. Louis (STL) to Washington D.C. (WAS)?
It takes about 2 hours 30 minutes to fly from St. Louis (STL) to Washington D.C. (WAS). -
What are the most popular airlines that fly from St. Louis (STL) to Washington D.C. (WAS)?
Airlines with flights from St. Louis (STL) to Washington D.C. (WAS): Southwest Airlines, Brussels Airlines, Copa Airlines, American Airlines, Lufthansa, United Airlines and avianca. -
How many airports in Washington D.C. (WAS)?
There are 2 airport(s) in Washington D.C. (WAS): Ronald Reagan Washington National Airport and Dulles International Airport.
How to find a cheap flight from St. Louis to Washington D.C.
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Washington D.C.. Book your flights at the right time and save more.
Be flexible with your travel dates to get the cheapest flight from St. Louis to Washington D.C..
Simply tap "Date" on the flight search bar to browse through the calendar and check out airfare from St. Louis to Washington D.C. over the next 6 months in 2025. If you're planning to fly within the next three months, it looks like the most affordable option is on Wed, Jul 2, with one-way flights priced at just £51.
Compare cheap flight deals from St. Louis to Washington D.C. across hundreds of airlines.
With our extensive search, you can compare prices from over 500 airlines to find the cheapest flight tickets from St. Louis to Washington D.C.. The cheapest airline for this route is American Airlines.
Set up a Price Alert
By setting up a Price Alert for your journey from St. Louis to Washington D.C., you can easily keep an eye on ticket prices without having to check every day.
Don't miss out on cheap flight deals and promo codes from St. Louis to Washington D.C..
You can always find the latest offers through Trip.com Deals and Promo Codes for cheap flights. By signing up for a free membership, you'll get access to even more deals for your flights.
Book early or wait until the last minute.
It's usually best to book early. Flight tickets are often cheapest when they're first released, typically about a year before the departure date. So, have a look online as soon as the flights you're interested in become available. If you miss the cheapest time, you might still find some good deals as the departure date gets closer.
Search for flights on the go.
For the best travel flight booking experience, download the Trip.com app. You can search for cheap flights from St. Louis to Washington D.C. and snag some exclusive deals just for you.
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