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Cheap flights from Washington, D.C. to St Louis

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Flight deals from Washington, D.C. to St Louis

Looking for a cheap last-minute deal or the best round-trip flight from Washington, D.C. to St Louis Airport? If you want to travel next month, round-trip fares start from $120. Find the lowest prices on one-way and round-trip tickets right here.
St Louis.$119 per passenger.Departing Tue, May 19, returning Tue, May 26.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Tue, May 19, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, May 26, arriving in Washington Dulles.Price includes taxes and charges.From $119, select.
St Louis.$120 per passenger.Departing Tue, Jun 9, returning Tue, Jun 16.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Tue, Jun 9, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jun 16, arriving in Washington Dulles.Price includes taxes and charges.From $120, select.
St Louis.$121 per passenger.Departing Tue, May 19, returning Tue, Jun 2.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Tue, May 19, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jun 2, arriving in Washington Dulles.Price includes taxes and charges.From $121, select.
St Louis.$190 per passenger.Departing Wed, Jun 3, returning Wed, Jul 1.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Wed, Jun 3, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Wed, Jul 1, arriving in Washington Dulles.Price includes taxes and charges.From $190, select.
St Louis.$191 per passenger.Departing Tue, Jul 14, returning Tue, Jul 21.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Ronald Reagan on Tue, Jul 14, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jul 21, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $191, select.
St Louis.$201 per passenger.Departing Wed, Sep 2, returning Wed, Sep 9.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Wed, Sep 2, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Sep 9, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $201, select.
St Louis.$202 per passenger.Departing Wed, Aug 12, returning Wed, Aug 19.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Wed, Aug 12, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Aug 19, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $202, select.
St Louis.$211 per passenger.Departing Wed, Jul 15, returning Sat, Aug 15.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Baltimore Washington International on Wed, Jul 15, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Aug 15, arriving in Baltimore Washington International.Price includes taxes and charges.From $211, select.
St Louis.$224 per passenger.Departing Thu, May 21, returning Sun, Aug 23.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Washington Dulles on Thu, May 21, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sun, Aug 23, arriving in Washington Dulles.Price includes taxes and charges.From $224, select.
St Louis.$237 per passenger.Departing Wed, May 20, returning Wed, May 27.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Wed, May 20, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, May 27, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $237, select.
St Louis.$237 per passenger.Departing Wed, Jun 17, returning Wed, Jun 24.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Wed, Jun 17, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Jun 24, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $237, select.
St Louis.$238 per passenger.Departing Wed, Jul 1, returning Wed, Jul 1.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Wed, Jul 1, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Jul 1, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $238, select.
St Louis.$266 per passenger.Departing Sat, May 30, returning Wed, Jun 10.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Sat, May 30, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Jun 10, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $266, select.
St Louis.$280 per passenger.Departing Wed, Jul 15, returning Sat, Aug 15.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Wed, Jul 15, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Sat, Aug 15, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $280, select.
St Louis.$287 per passenger.Departing Thu, Oct 8, returning Sat, Oct 10.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Washington Ronald Reagan on Thu, Oct 8, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Sat, Oct 10, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $287, select.
St Louis.$297 per passenger.Departing Wed, Aug 19, returning Mon, Nov 9.Round-trip flight with United.Outbound indirect flight with United, departing from Washington Ronald Reagan on Wed, Aug 19, arriving in St Louis.Inbound indirect flight with United, departing from St Louis on Mon, Nov 9, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $297, 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 May.
May
from $119
Jun
from $120
Jul
from $191
Aug
from $202
Sep
from $201
Oct
from $287
Nov
from $336
Dec
from $380
Jan
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Feb
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Mar
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Apr
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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 $119
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Belleville

32km from central St Louis
from $338
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Sparta Community

69km from central St Louis
Search flights

Washington, D.C. to St Louis: Flight information

The things to know before you go.
Cheapest flight found$119
Cheapest month to flyMay
Average flight time2 hrs, 24 mins
Most popular airlineSouthwest Airlines
Average flights per week166

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

The best price we found for a round-trip flight from Washington, D.C. to St Louis is $119. 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.
There are 166 flights per week flying from Washington, D.C. to St Louis, as of May 2026.
The cheapest month to fly from Washington, D.C. to St Louis is usually May.
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, May 19, 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

  • Your adventure gets underway at one of Washington DC's main airports, Ronald Reagan Washington National Airport (DCA) or Washington Dulles International Airport (IAD). Explore the options for booking a flight from Washington DC to St Louis Lambert International Airport (STL) departing from either of these bases.

  • 2 hours 25 minutes is the average journey time for a direct Washington DC to St Louis Lambert International Airport flight.

  • The timezone in St Louis is UTC-6, which is one hour behind Washington DC. St Louis Lambert International Airport is located in St Louis.

  • Ronald Reagan Washington National Airport (DCA) to St Louis Lambert International Airport (STL) is the most popular route. There are 39 direct weekly departures to pick from. If you have things to do before leaving, hop on the last flight with American Airlines at 10pm. Choose the first DCA to STL departure with Southwest Airlines at 6:30am if you'd rather get going earlier.

  • For hassle-free travel, arrive at the airport two hours ahead of international flights and one hour before domestic departures. This ensures you have enough time to catch your flight from Washington DC to STL.

  • Getting away during a peak month like April? High seasons (like Christmas and New Year) can add another hour at security. Be extra cautious and arrive up to four hours ahead of an international flight and two hours before a domestic departure.

Airports in Washington DC

Ronald Reagan Washington National Airport (DCA)

  • Ronald Reagan Washington National Airport (DCA) offers an easy route to your destination. Nonstop flights from Washington DC to St Louis Lambert International Airport (STL) leave from this terminal.

  • When departing from DCA, you can take a direct flight from Washington DC to St Louis Lambert International Airport with American Airlines.

  • The top choice among passengers flying between DCA and STL is American Airlines.

  • Among carriers operating on this route, American Airlines is the most consistent for on-time landings.

  • Traveling from central Washington DC to DCA takes around 25 minutes by public transport. If you drive, ride-share or get a cab, you'll cover the 6 kilometers in 10 minutes or so, depending on traffic.

  • Want a stress-free start to your vacation? Stay near Ronald Reagan Washington National Airport. Whether you have an early flight from Washington DC to St Louis Lambert International Airport or prefer not to rush, these hotels are the answer:

  • 76% of flights that depart Ronald Reagan Washington National Airport reach their destination on schedule.

  • You'll find DCA 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). Decide if leaving from IAD is a better fit for your trip.

  • Catch your direct flight from Washington DC to STL with United Airlines. This is one of the main airlines operating this route out of IAD.

  • United attracts the most bookings on the IAD to STL route.

  • With 78.15% of services arriving as scheduled, United is the top on-time carrier flying between Washington Dulles International Airport and St Louis Lambert International Airport.

  • With public transport, you can travel from central Washington DC to IAD in around 1 hour 10 minutes. The airport is roughly 40 kilometers away, and getting there by car takes approximately 45 minutes.

  • Flying out early in the morning? You might like to check in to one of these accommodation options near Washington Dulles International Airport the day before your Washington DC to STL flight:

  • When it comes to flight punctuality, Washington Dulles International Airport has an on-time arrival performance of 74%.

  • IAD is located at 1 Saarinen Circle.

Baltimore Washington International Airport (BWI)

  • Get to your destination faster from Baltimore Washington International Airport (BWI). Direct flights from Washington DC to St Louis Lambert International Airport are available from here.

  • Southwest Airlines is one well-known airline that offers direct Washington DC to STL plane tickets from BWI.

  • Southwest Airlines is the airline with the highest passenger demand for flights from BWI to STL.

  • Southwest Airlines is the most punctual carrier on this route, with 78.61% of its services arriving as scheduled.

  • The trip to BWI from central Washington DC is around 50 minutes on public transport. If you're in a car, it'll take you about 40 minutes to cover the 48 kilometers or so.

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

  • The on-time performance rate of BWI is 77%. In simpler terms, that's how frequently flights from this airport arrive at their destination as planned.

About St Louis Lambert International Airport (STL)

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

  • From St Louis Lambert International Airport, central St Louis is around 24 kilometers away. It takes about 25 minutes to get to the city center by car.

  • When traveling on public transport, expect a journey of about 30 minutes.

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

  • $59 is the best price for a one-way ticket from Washington DC to St Louis Lambert International Airport. Return flights start from $119. These prices can change depending on demand.

  • Don't leave things to the last minute. You're more likely to find cheap flights from Washington DC to STL if you book ahead. Airlines often offer some excellent early bird discounts.

  • The 'Whole month' tool shows you the cheapest Washington DC to St Louis Lambert International Airport tickets across each month. It's a good way to snap up a bargain if your travel plans aren't set in stone.

  • Never miss a deal on plane tickets from Washington DC to STL by setting up a Price Alert. We'll send you an email or notification through the app when a lower fare becomes available.

  • Save on your flight from Washington DC to St Louis Lambert International Airport by using filters. Select your preferred duration, departure time and airlines, then sort the results by 'Cheapest' for the best deals.

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

  • Think about the kind of vacation you want when deciding when to fly. September is the quietest month to go to St Louis. October is when most people book flights from Washington DC to St Louis Lambert International Airport (STL), which may be ideal if you'd rather travel when it's busy.

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

  • Look for cheap tickets from Washington DC to St Louis Lambert International Airport in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -8ºC (18ºF) and 7ºC (45ºF).

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 you'll want to see. Around 257 kilometers east of St Louis, a trip to Evansville will keep your itinerary packed. Check out popular attractions like Mesker Park Zoo, Riverfront Park and Evansville Zoological Society.

  • If you're ready to explore another well-known destination in the United States, consider Columbia, about 177 kilometers west of St Louis. Sentinel Park, Bur Oak Brewing Company and Museum of Art and Archaeology are key reasons to visit.

Plan the rest of your trip from Washington, D.C. to St Louis

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.