Cheap Flights from Washington D.C. to St Louis

Compare Washington D.C. to St Louis flight deals

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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 R 1,986. Find the lowest prices on one-way and return tickets right here.

St Louis.R 971 per passenger.Departing Mon, 1 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Mon, 1 Jun, arriving in St Louis.Price includes taxes and charges.From R 971, select.

St Louis.R 981 per passenger.Departing Tue, 19 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 19 May, arriving in St Louis.Price includes taxes and charges.From R 981, select.

St Louis.R 1,576 per passenger.Departing Tue, 28 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 28 Jul, arriving in St Louis.Price includes taxes and charges.From R 1,576, select.

St Louis.R 1,666 per passenger.Departing Tue, 18 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 18 Aug, arriving in St Louis.Price includes taxes and charges.From R 1,666, select.

St Louis.R 1,669 per passenger.Departing Tue, 18 Aug.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 18 Aug, arriving in St Louis.Price includes taxes and charges.From R 1,669, select.

St Louis.R 1,969 per passenger.Departing Wed, 3 Jun.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Wed, 3 Jun, arriving in St Louis.Price includes taxes and charges.From R 1,969, select.

St Louis.R 1,969 per passenger.Departing Tue, 19 May.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Tue, 19 May, arriving in St Louis.Price includes taxes and charges.From R 1,969, select.

St Louis.R 1,998 per passenger.Departing Fri, 4 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Fri, 4 Sep, arriving in St Louis.Price includes taxes and charges.From R 1,998, select.

St Louis.R 2,610 per passenger.Departing Sat, 18 Jul.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Washington Ronald Reagan on Sat, 18 Jul, arriving in St Louis.Price includes taxes and charges.From R 2,610, select.

St Louis.R 2,624 per passenger.Departing Sat, 5 Sep.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 5 Sep, arriving in St Louis.Price includes taxes and charges.From R 2,624, select.

St Louis.R 2,773 per passenger.Departing Wed, 14 Oct.One-way flight with United.Outbound indirect flight with United, departs from Washington Dulles on Wed, 14 Oct, arriving in St Louis.Price includes taxes and charges.From R 2,773, select.

St Louis.R 2,892 per passenger.Departing Thu, 1 Oct.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Thu, 1 Oct, arriving in St Louis.Price includes taxes and charges.From R 2,892, select.

St Louis.R 3,314 per passenger.Departing Fri, 6 Nov.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Ronald Reagan on Fri, 6 Nov, arriving in St Louis.Price includes taxes and charges.From R 3,314, select.

St Louis.R 4,131 per passenger.Departing Fri, 19 Mar.One-way flight with Delta.Outbound indirect flight with Delta, departs from Washington Ronald Reagan on Fri, 19 Mar, arriving in St Louis.Price includes taxes and charges.From R 4,131, select.

St Louis.R 10,224 per passenger.Departing Fri, 19 Mar.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Fri, 19 Mar, arriving in St Louis.Price includes taxes and charges.From R 10,224, 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 June.

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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.

Washington D.C. to St Louis: Flight information

The things to know before you go.

Cheapest flight found	R 971
Cheapest month to fly	June
Average flight time	2 hrs, 24 mins
Most popular airline	Southwest Airlines
Average flights per week	424

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

How much are return flights from Washington D.C. to St Louis?

The best price we found for a return flight from Washington D.C. to St Louis is R 1,967. 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.

How long does it take to fly from Washington D.C. to St Louis?

2 hours and 24 minutes is the average flight time from Washington D.C. to St Louis.

Which airlines fly direct from Washington D.C. to St Louis?

Southwest Airlines, American Airlines and PSA Airlines fly direct from Washington D.C. to St Louis.

How many flights are there a week from Washington D.C. to St Louis?

As of May 2026, there are 166 flights per week flying from Washington D.C. to St Louis.

When is the cheapest time to fly from Washington D.C. to St Louis?

The cheapest month to fly from Washington D.C. to St Louis is usually May.

Which upcoming date is cheapest to fly from Washington D.C. to St Louis Airport on?

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, 19 May 2026.

Can I get a direct flight from Washington D.C. to St Louis Airport?

Yes – the average flight time is 2 hours and 24 minutes.

How can I find the best flight deal to St Louis?

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.

When is the best time to book flights to St Louis?

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.
Travelling from central Washington DC to DCA takes around 25 minutes by public transport. If you drive, ride-share or get a taxi, you'll cover the 6 kilometres in 10 minutes or so, depending on traffic.
Want a stress-free start to your holiday? 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 kilometres 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 kilometres 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)

Consider staying in a hotel close to STL if you're catching a late flight from Washington DC to St Louis Lambert International Airport. Pick one of these options and say goodnight sooner:
Pick up a St Louis Lambert International Airport rental car and discover St Louis and beyond with your own set of wheels. Hertz, Budget and Alamo are leading providers to choose from here.
Booking your ride around one week ahead of your Washington DC to St Louis Lambert International Airport flight can help you get the lowest rate.
You'll find STL at 10701 Lambert International Blvd..

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

From St Louis Lambert International Airport, central St Louis is around 24 kilometres away. It takes about 25 minutes to get to the city centre by car.
When travelling 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)

R 971 is the best price for a one-way ticket from Washington DC to St Louis Lambert International Airport. Return flights start from R 1,967. 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 holiday 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

Once you've booked your flight from Washington DC to St Louis Lambert International Airport, find a hotel that keeps you close to what you want to see. Make one of these accommodation options your base for exploring St Louis:
The Gateway Arch and Saint Louis Arch are just a couple of the big attractions to add to your St Louis must-do list. Keep the adventure rolling by checking out Museum at the Gateway Arch.

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 kilometres 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 kilometres west of St Louis. Sentinel Park, Bur Oak Brewing Company and Museum of Art and Archaeology are key reasons to visit.