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Cheap Flights from Washington D.C. (WASA) to St Louis (STL)

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Flight deals from Washington D.C. to St Louis

Looking for a cheap last-minute deal or the best return flight from Washington D.C. to St Louis Airport? If you want to travel next month, return fares start from $224. Find the lowest prices on one-way and return tickets right here.
St Louis.$208 per passenger.Departing Tue, 21 Jul, returning Mon, 27 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 21 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 27 Jul, arriving in Baltimore Washington International.Price includes taxes and charges.From $208, select.
St Louis.$212 per passenger.Departing Tue, 21 Jul, returning Tue, 4 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 21 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 4 Aug, arriving in Baltimore Washington International.Price includes taxes and charges.From $212, select.
St Louis.$224 per passenger.Departing Thu, 6 Aug, returning Sun, 9 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Thu, 6 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 9 Aug, arriving in Baltimore Washington International.Price includes taxes and charges.From $224, select.
St Louis.$230 per passenger.Departing Wed, 16 Sep, returning Sun, 27 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Wed, 16 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 27 Sep, arriving in Washington Dulles.Price includes taxes and charges.From $230, select.
St Louis.$341 per passenger.Departing Tue, 22 Sep, returning Sat, 26 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 22 Sep, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 26 Sep, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $341, select.
St Louis.$341 per passenger.Departing Sat, 1 Aug, returning Tue, 4 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Sat, 1 Aug, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 4 Aug, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $341, select.
St Louis.$342 per passenger.Departing Tue, 6 Oct, returning Tue, 27 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 6 Oct, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 27 Oct, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $342, select.
St Louis.$342 per passenger.Departing Sat, 25 Jul, returning Tue, 28 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Sat, 25 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 28 Jul, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $342, select.
St Louis.$343 per passenger.Departing Wed, 29 Jul, returning Tue, 4 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Wed, 29 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 4 Aug, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $343, select.
St Louis.$365 per passenger.Departing Thu, 27 Aug, returning Wed, 2 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Thu, 27 Aug, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Wed, 2 Sep, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $365, select.
St Louis.$375 per passenger.Departing Thu, 5 Nov, returning Mon, 9 Nov.Return flight with United.Outbound indirect flight with United, departs from Washington Ronald Reagan on Thu, 5 Nov, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Mon, 9 Nov, arriving in Washington Dulles.Price includes taxes and charges.From $375, select.
St Louis.$389 per passenger.Departing Thu, 5 Nov, returning Mon, 9 Nov.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Thu, 5 Nov, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Mon, 9 Nov, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $389, select.
St Louis.$400 per passenger.Departing Tue, 24 Nov, returning Tue, 1 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 24 Nov, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 1 Dec, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $400, select.
St Louis.$406 per passenger.Departing Thu, 3 Dec, returning Mon, 21 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Thu, 3 Dec, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Mon, 21 Dec, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $406, select.
St Louis.$422 per passenger.Departing Fri, 30 Oct, returning Sun, 1 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Fri, 30 Oct, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 1 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From $422, select.
St Louis.$446 per passenger.Departing Wed, 30 Sep, returning Sun, 4 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Wed, 30 Sep, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 4 Oct, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $446, select.

Find the cheapest month to fly from Washington D.C. to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington D.C. to St Louis flights are currently cheapest in July.
Jul
from $208
Aug
from $224
Sep
from $230
Oct
from $342
Nov
from $375
Dec
from $406
Jan
from $453
Feb
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Mar
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Apr
from $498
May
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Jun
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Direct flights from Washington D.C. to St Louis

Washington D.C. to St Louis: Alternative routes

Compare routes from Washington D.C. to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

St Louis

20km from central St Louis
ClosestCheapest
from $208
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Belleville

32km from central St Louis
Search flights

Washington D.C. to St Louis: Flight information

The things to know before you go.
Cheapest flight found$208
Cheapest month to flyJuly
Average flight time2 hrs, 24 mins
Most popular airlineSouthwest Airlines
Average flights per week174

Finding cheap flights from Washington D.C. to St Louis: Frequently asked questions

The best price we found for a return flight from Washington D.C. to St Louis is $208. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 24 minutes is the average flight time from Washington D.C. to St Louis.
Southwest Airlines, American Airlines and PSA Airlines fly direct from Washington D.C. to St Louis.
As of July 2026, there are 174 flights per week flying from Washington D.C. to St Louis.
The cheapest month to fly from Washington D.C. to St Louis is usually July.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Washington D.C. to St Louis Airport on Tuesday, 21 July 2026.
Yes – the average flight time is 2 hours and 24 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Flying from Washington DC to St Louis Lambert International Airport (STL): What you need to know

  • Start planning your trip by checking out the most convenient departure point for your flight from Washington DC to St Louis Lambert International Airport (STL). Explore the options for setting off from Ronald Reagan Washington National Airport (DCA) or Washington Dulles International Airport (IAD), the city's main airports.

  • Expect to be in the air for 2 hours 25 minutes. That's the average time for a direct Washington DC to St Louis Lambert International Airport flight.

  • St Louis Lambert International Airport is located in St Louis. The city runs on the UTC-6 timezone and is one hour behind Washington DC.

  • With 42 direct weekly flights between the two airports, Ronald Reagan Washington National Airport (DCA) to St Louis Lambert International Airport (STL) is the busiest route. Southwest Airlines operates the earliest flight at 6:30am. If you'd like to make the most of your day before leaving, the latest flight from DCA to STL is with American Airlines at 10pm.

  • To ensure you get on your flight from Washington DC to STL, leave plenty of time for things like baggage drop and finding your gate. Arriving two hours before international departures and an hour before domestic flights is the general travel rule.

  • With more travellers during busy months like July, be at your terminal even earlier. Two hours for domestic flights and up to four for international journeys will allow for extra wait times. Remember things also get busy during major holidays like Christmas and local events or festivals.

Airports in Washington DC

Ronald Reagan Washington National Airport (DCA)

  • You can hop on a direct flight from Washington DC to St Louis Lambert International Airport (STL) out of Ronald Reagan Washington National Airport (DCA).

  • American Airlines is a well-known airline that operates direct flights from Washington DC to St Louis Lambert International Airport leaving from DCA.

  • American Airlines is the most frequently booked airline offering flights from DCA to STL.

  • Southwest Airlines is the most punctual carrier on this route, with 73.1% of its services reaching their destination on time.

  • DCA is about 6 kilometres from central Washington DC. If you're ride-sharing, driving or catching a taxi from the centre, it'll take 10 minutes or so to get there, depending on the traffic. If you're planning to take public transport, expect the trip time to be around 25 minutes.

  • Catching an early flight from Washington DC to St Louis Lambert International Airport? Avoid the last-minute rush to the terminal (and get some bonus sleep) by staying at one of these hotels near Ronald Reagan Washington National Airport:

  • 71% of flights that take off from Ronald Reagan Washington National Airport reach their destination on schedule.

  • DCA is located at 1 Aviation Circle.

Washington Dulles International Airport (IAD)

  • You can book a direct Washington DC to St Louis Lambert International Airport (STL) plane ticket out of Washington Dulles International Airport (IAD). Work out whether departing from IAD makes the most sense for you.

  • From IAD, direct flights from Washington DC to STL are available with United Airlines.

  • On the IAD to STL route, United is the preferred choice of many.

  • With 71.79% of services arriving as scheduled, United is the top on-time carrier flying between Washington Dulles International Airport and St Louis Lambert International Airport.

  • On public transport, you can travel from central Washington DC to IAD in about 1 hour 10 minutes. The airport is roughly 40 kilometres away, and making the journey by car will take approximately 45 minutes.

  • Flying off with the first light? You might like to check in to one of these hotels near Washington Dulles International Airport the day before your Washington DC to STL flight:

  • Washington Dulles International Airport has an on-time performance of 77%. This figure highlights how often flights that leave from this airport land at their destination on time.

  • The address for IAD is 1 Saarinen Circle.

Baltimore Washington International Airport (BWI)

  • Enjoy a hassle-free trip from start to finish from Baltimore Washington International Airport (BWI). Direct flights from Washington DC to St Louis Lambert International Airport can be booked from here.

  • Prepare for takeoff with Southwest Airlines. It offers direct Washington DC to STL plane tickets from BWI.

  • The preferred airline for passengers flying between BWI and STL is Southwest Airlines.

  • With 79.19% of its services arriving as scheduled, Southwest Airlines is the top on-time carrier on this route.

  • The journey time to BWI from central Washington DC is around 50 minutes on public transport. If you're planning to travel by car, it'll take you roughly 40 minutes to cover the 48 kilometres or so.

  • Make catching an early Washington DC to St Louis Lambert International Airport flight the easiest part of your journey. Stay at one of these accommodation options close to Baltimore Washington International Airport and head to your check-in counter feeling relaxed and unhurried:

  • The on-time performance rating of BWI is 77%. In other words, that's how often flights that depart this airport arrive as planned.

About St Louis Lambert International Airport (STL)

Getting from St Louis Lambert International Airport (STL) to central St Louis

  • Central St Louis is around 24 kilometres from St Louis Lambert International Airport and takes about 25 minutes to reach by car. Explore your options for getting into the city, whether that's with a taxi, car hire or ride-share.

  • It typically takes 30 minutes if you're travelling on public transport.

How to find the cheapest flights from Washington DC to St Louis Lambert International Airport (STL)

  • Right now, $87 is the lowest price we've found for a one-way ticket from Washington DC to St Louis Lambert International Airport. The cheapest price for a return flight is $208. Keep in mind fares can change due to availability at the time of booking.

  • To find cheap flights from Washington DC to STL, book early. Airlines typically offer the most competitive fares when flights first go on sale.

  • If you're flexible with your travel plans, try using the 'Whole month' search tool. It'll give you the lowest price in each month when searching for your Washington DC to St Louis Lambert International Airport ticket.

  • Finding a cheap plane ticket from Washington DC to STL couldn't be easier with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch as soon as a better deal is available.

  • Tailor your trip using filters. Select your preferred arrival and departure times, airlines and total journey duration. You can also sort the results by 'Cheapest,' 'Fastest' or 'Best' flights from Washington DC to St Louis Lambert International Airport.

The best time to fly from Washington DC to St Louis Lambert International Airport (STL)

  • July is the most popular month for flights from Washington DC to St Louis Lambert International Airport (STL). Plan your visit to St Louis in December for a quieter experience.

  • When booking your Washington DC to STL plane ticket, consider the kind of weather forecast you're hoping for. July is the warmest month in St Louis, with temperatures ranging from 17ºC (63ºF) to 33ºC (91ºF).

  • January sees temperatures of between -7ºC (19ºF) and 8ºC (46ºF). Search for cheap tickets from Washington DC to St Louis Lambert International Airport around that time if you want to travel when it's cooler.

More about St Louis

Explore more of the United States

  • St Louis is always a good idea, but there are so many other corners of the United States just waiting to be discovered. Around 257 kilometres east of St Louis, a visit to Evansville will keep you on the go. Start with popular sights like Mesker Park Zoo, Riverfront Park and Evansville Museum of Arts, History & Science.

  • Around 177 kilometres west of St Louis, Columbia is another essential stop in the United States. Experience this destination's highlights firsthand at Museum of Art and Archaeology, Mizzou Botanic Garden and Francis Quadrangle.

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Prices shown on this page are estimated lowest prices only. Found in the last 12 days.