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Cheap flight tickets from Washington D.C. to St Louis

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

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 RM632. Find the lowest prices on one-way and return tickets right here.
St Louis.RM632 per passenger.Departing Thu, 16 Apr, returning Mon, 20 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Thu, 16 Apr, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 20 Apr, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM632, select.
St Louis.RM712 per passenger.Departing Fri, 29 May, returning Sun, 31 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Fri, 29 May, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 31 May, arriving in Baltimore Washington International.Price includes taxes and charges.From RM712, select.
St Louis.RM795 per passenger.Departing Sat, 30 May, returning Mon, 1 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Sat, 30 May, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 1 Jun, arriving in Baltimore Washington International.Price includes taxes and charges.From RM795, select.
St Louis.RM807 per passenger.Departing Tue, 24 Mar, returning Sat, 28 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 24 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 28 Mar, arriving in Baltimore Washington International.Price includes taxes and charges.From RM807, select.
St Louis.RM846 per passenger.Departing Tue, 31 Mar, returning Wed, 1 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Tue, 31 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 1 Apr, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM846, select.
St Louis.RM912 per passenger.Departing Tue, 5 May, returning Sat, 9 May.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 5 May, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 9 May, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM912, select.
St Louis.RM928 per passenger.Departing Fri, 24 Apr, returning Fri, 1 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Fri, 24 Apr, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 1 May, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM928, select.
St Louis.RM932 per passenger.Departing Tue, 7 Apr, returning Tue, 7 Apr.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 7 Apr, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 7 Apr, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM932, select.
St Louis.RM935 per passenger.Departing Wed, 29 Apr, returning Tue, 5 May.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Wed, 29 Apr, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 5 May, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM935, select.
St Louis.RM944 per passenger.Departing Sat, 30 May, returning Mon, 1 Jun.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Sat, 30 May, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Mon, 1 Jun, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM944, select.
St Louis.RM1,011 per passenger.Departing Tue, 9 Jun, returning Sun, 14 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Tue, 9 Jun, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 14 Jun, arriving in Washington Dulles.Price includes taxes and charges.From RM1,011, select.
St Louis.RM1,160 per passenger.Departing Thu, 6 Aug, returning Tue, 11 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Thu, 6 Aug, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 11 Aug, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM1,160, select.
St Louis.RM1,165 per passenger.Departing Sat, 25 Jul, returning Wed, 29 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 Wed, 29 Jul, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM1,165, select.
St Louis.RM1,243 per passenger.Departing Wed, 10 Jun, returning Sun, 14 Jun.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Wed, 10 Jun, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 14 Jun, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM1,243, select.
St Louis.RM1,295 per passenger.Departing Mon, 29 Jun, returning Sun, 5 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Mon, 29 Jun, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 5 Jul, arriving in Washington Ronald Reagan.Price includes taxes and charges.From RM1,295, select.
St Louis.RM1,421 per passenger.Departing Sat, 28 Mar, returning Sat, 4 Apr.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 28 Mar, arriving in St Louis.Inbound direct flight with United departs from St Louis on Sat, 4 Apr, arriving in Washington Dulles.Price includes taxes and charges.From RM1,421, 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 April.
Mar
from RM807
Apr
from RM632
May
from RM712
Jun
from RM1,011
Jul
from RM1,165
Aug
from RM1,160
Sep
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Oct
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Nov
from RM2,921
Dec
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Jan
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Feb
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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 RM632
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Belleville

32km from central St Louis
Search flights

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 foundRM632
Cheapest month to flyApril
Average flight time2 hrs, 25 mins
Most popular airlineSouthwest Airlines
Average flights per week185

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 RM632. 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 25 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 March 2026, there are 185 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 April.
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 Thursday, 16 April 2026.
Yes – the average flight time is 2 hours and 25 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.

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

  • Start your journey at one of Washington DC's main airports, Ronald Reagan National Airport (DCA) or Washington Dulles International Airport (IAD). Check out your options for booking a flight from Washington DC to Lambert-St. Louis International Airport (STL) taking off from either of these.

  • The average length of a direct Washington DC to Lambert-St. Louis International Airport flight is 2 hours 20 minutes.

  • The timezone in St Louis is UTC-5, which is one hour behind Washington DC. Lambert-St. Louis International Airport is located in St Louis.

  • Ronald Reagan National Airport (DCA) to Lambert-St. Louis International Airport (STL) is the most popular route. There are 34 direct departures a week to pick from. If you prefer starting your day later, take the last flight with American Airlines at 10pm. Choose the first DCA to STL departure operated by Southwest Airlines at 6:30am if you'd rather get going earlier.

  • Your flight from Washington DC to STL won't wait if you're running late, so don't forget to check in on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • Planning to travel during a peak period like public or school holidays? Expect longer queues at check-in and security. To play it safe, arrive up to four hours before international flights and two hours before domestic departures.

Airports in Washington DC

Ronald Reagan National Airport (DCA)

  • Reach your destination without the detour from Ronald Reagan National Airport (DCA). Direct flights from Washington DC to Lambert-St. Louis International Airport (STL) can be booked from here.

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

  • American Airlines ranks first in bookings for flights from DCA to STL.

  • American Airlines is the best performing carrier for punctuality on this route.

  • Located around 8 kilometres from the centre of Washington DC, DCA can be reached in about 15 minutes by car, depending on traffic. The journey on public transport will take roughly 45 minutes.

  • In search of a convenient hotel near Ronald Reagan National Airport? If you're catching an early flight from Washington DC to Lambert-St. Louis International Airport, these stays will put you conveniently close to check-in:

  • When it comes to the on-time performance of Ronald Reagan National Airport, data shows 76.44% of flights complete their journey on time.

  • DCA's address is 1 Aviation Circle.

Washington Dulles International Airport (IAD)

  • Catching a flight out of Washington Dulles International Airport (IAD)? Direct Washington DC to Lambert-St. Louis International Airport (STL) plane tickets are available from here.

  • United Airlines offers direct flights from Washington DC to STL leaving from IAD. Book your favourite window (or aisle) seat and get to your destination in one go.

  • United Airlines is the top choice for travellers flying from IAD to STL.

  • United Airlines is the most reliable carrier flying between Washington Dulles International Airport and Lambert-St. Louis International Airport, with 78.15% of its services landing on time.

  • Using public transport, you can travel from central Washington DC to IAD in around 1 hour 10 minutes. The airport is roughly 56 kilometres away, and making the trip by car will take approximately 50 minutes.

  • Want to enjoy an extra night away before catching your Washington DC to STL flight? Check in to a hotel near Washington Dulles International Airport before your trip officially starts. Here's where you can stay:

  • Washington Dulles International Airport has an on-time performance of 74.39%. This figure gives an insight into how often flights that leave from this airport land at their destination on schedule.

  • The street address for IAD is 1 Saarinen Circle.

Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • One takeoff, one touchdown. You can book a direct flight from Washington DC to Lambert-St. Louis International Airport departing from Baltimore/Wash International Thurgood Marshall Airport (BWI).

  • Southwest Airlines is one popular carrier that offers direct Washington DC to STL plane tickets from BWI.

  • The airline most travellers choose when flying between BWI and STL is Southwest Airlines.

  • The carrier with the best punctuality score on this route is Southwest Airlines. Its services arrive as scheduled 78.61% of the time.

  • From central Washington DC, BWI is around 48 kilometres away. It takes roughly 50 minutes to reach the airport by car and 1 hour 30 minutes or so on public transport.

  • Make catching an early Washington DC to Lambert-St. Louis International Airport flight the easiest part of your journey. Stay at one of these accommodation options near Baltimore/Wash International Thurgood Marshall Airport and get to your gate feeling relaxed and unhurried:

  • Airports have an on-time performance rating that measures how often flights reach their destinations without delays. At BWI, that figure is 77.13%.

About Lambert-St. Louis International Airport (STL)

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

  • Lambert-St. Louis International Airport to central St Louis is about 16 kilometres. If you're taking a cab or renting a car, do a little research to make your trip as easy as possible. Journey times may vary depending on traffic conditions and the time of day.

  • If you're taking public transport, expect a journey of around 35 minutes.

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

  • Currently, RM316 is the lowest price we've found for a one-way ticket from Washington DC to Lambert-St. Louis International Airport. The cheapest price for a return flight is RM632. Remember fares can change due to demand at the time of booking.

  • To find cheap flights from Washington DC to STL, book in advance. Airlines usually offer the most competitive fares when flights are first released.

  • The 'Whole month' search tool shows you the cheapest Washington DC to Lambert-St. Louis International Airport tickets throughout the month. It's a good way to find a bargain if your travel plans are flexible.

  • Save time searching for cheap plane tickets from Washington DC to STL by creating a Price Alert. We'll send you an email or notification through the app when a lower fare pops up.

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

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

  • It's time to figure out your travel dates for your flight from Washington DC to Lambert-St. Louis International Airport (STL). July is the busiest month to travel to St Louis. If you prefer a quieter vibe, think about going in April.

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

  • January has temperatures of between -8ºC (18ºF) and 7ºC (45ºF). Look for cheap tickets from Washington DC to Lambert-St. Louis International Airport around that time if you like travelling in cooler conditions.

More about St Louis

Explore more of the United States

  • You've visited St Louis, now it's time to discover other parts of the United States. Journey around 257 kilometres east to Evansville to check off its leading attractions. From Mesker Park Zoo to Riverfront Park and Evansville Zoological Society, there's plenty to keep you on the go.

  • Columbia is another essential stop in the United States and is around 177 kilometres west of St Louis. No trip is complete without dropping by Sentinel Park, Museum of Art and Archaeology and Bur Oak Brewing Company.

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.