Cheap Flights from St Louis to Baltimore Washington International

Compare St Louis to Baltimore Washington International flight deals

Find the cheapest month or even day of the year to fly to Baltimore Washington International

Book the best Baltimore Washington International fare with no extra fees

Flight deals from St Louis to Baltimore Washington International

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Baltimore Washington International Airport? If you want to travel next month, return fares start from Rs39,596. Find the lowest prices on one-way and return tickets right here.

Washington D.C..Rs15,927 per passenger.Departing Fri, 9 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 9 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs15,927, select.

Washington D.C..Rs17,883 per passenger.Departing Wed, 18 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 18 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs17,883, select.

Washington D.C..Rs18,254 per passenger.Departing Mon, 24 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 24 Aug, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs18,254, select.

Washington D.C..Rs19,497 per passenger.Departing Wed, 9 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 9 Sep, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs19,497, select.

Washington D.C..Rs41,229 per passenger.Departing Tue, 6 Oct.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue, 6 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs41,229, select.

Washington D.C..Rs41,322 per passenger.Departing Sat, 12 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Sat, 12 Dec, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs41,322, select.

Washington D.C..Rs41,568 per passenger.Departing Tue, 1 Sep.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue, 1 Sep, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs41,568, select.

Washington D.C..Rs41,657 per passenger.Departing Thu, 12 Nov.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 12 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs41,657, select.

Washington D.C..Rs41,657 per passenger.Departing Sat, 12 Dec.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sat, 12 Dec, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs41,657, select.

Washington D.C..Rs41,673 per passenger.Departing Thu, 20 Aug.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 20 Aug, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs41,673, select.

Washington D.C..Rs47,781 per passenger.Departing Fri, 31 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 31 Jul, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs47,781, select.

Washington D.C..Rs67,595 per passenger.Departing Mon, 17 May.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Mon, 17 May, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs67,595, select.

Washington D.C..Rs140,413 per passenger.Departing Fri, 31 Jul.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Fri, 31 Jul, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs140,413, select.

Find the cheapest month to fly from St Louis to Baltimore Washington International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Baltimore Washington International flights are currently cheapest in October.

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Direct flights from St Louis to Baltimore Washington International

St Louis to Baltimore Washington International: Alternative routes

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

St Louis to Washington D.C.: Flight information

The things to know before you go.

Cheapest flight found	Rs15,927
Cheapest month to fly	October
Average flight time	2 hrs
Most popular airline	Southwest Airlines
Average flights per week	33

Finding cheap flights from St Louis to Baltimore Washington International: Frequently asked questions

How much are return flights from St Louis to Baltimore Washington International?

The best price we found for a return flight from St Louis to Baltimore Washington International is Rs39,596. 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 St Louis to Baltimore Washington International?

2 hours is the average flight time from St Louis to Baltimore Washington International.

Which airlines fly direct from St Louis to Baltimore Washington International?

Southwest Airlines flies direct from St Louis to Baltimore Washington International.

How many flights are there a week from St Louis to Baltimore Washington International?

As of July 2026, there are 29 flights per week flying from St Louis to Baltimore Washington International.

When is the cheapest time to fly from St Louis to Baltimore Washington International?

The cheapest month to fly from St Louis to Baltimore Washington International is usually August.

Which upcoming date is cheapest to fly from St Louis Airport to Baltimore Washington International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Baltimore Washington International Airport on Friday, 28 August 2026.

Can I get a direct flight from St Louis Airport to Baltimore Washington International Airport?

Yes – the average flight time is 2 hours.

How can I find the best flight deal to Baltimore Washington International?

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 Baltimore Washington International 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 Washington D.C.?

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

Which is the cheapest airline to fly from St Louis Airport to Baltimore Washington International with?

Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Baltimore Washington International.

Flying from St Louis Airport (STL) to Baltimore Washington International Airport (BWI): what you need to know

The average duration of a direct flight from St Louis Airport to Baltimore Washington International Airport is 2 hours.
Washington DC is one hour ahead of St Louis and follows the UTC-5 timezone.
You can choose from 16 weekly St Louis Airport to Baltimore Washington International Airport flights. The 05:15 departure with Southwest Airlines is the earliest flight available. Southwest Airlines operates the latest service of the day at 21:55.
Arrive at the airport on time so you don't miss your STL to BWI flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid the stress of rushing.
During popular months such as July, it's best to get to the airport well in advance. Plan to arrive two hours before a domestic departure and four hours ahead for international flights when you fly during peak periods in general.
Southwest Airlines has direct flights from St Louis Airport to Baltimore Washington International Airport. Book with this popular carrier, then get ready to check out the sights in Washington DC — and maybe even more of the United States if you have time.
Southwest Airlines is the most frequently booked airline on this route.
Southwest Airlines is a leader in on-time performance for STL to BWI flights, with 80.1% of services arriving as scheduled.
We make it simple to book a flight with a stopover. To see all your options for tickets from St Louis Airport to Baltimore Washington International Airport, deselect 'Direct flights only.' Then, pick a flight with a stop long enough to tour your chosen city. Stopovers between STL and BWI include:
- Atlanta Hartsfield-Jackson Airport
- Detroit Wayne County Airport
- Nashville Airport

How to find the cheapest flights from St Louis Airport (STL) to Baltimore Washington International Airport (BWI)

The cheapest price we've found for a one-way St Louis Airport to Baltimore Washington International Airport flight is Rs15,927. A return ticket right now is Rs39,596. Depending on the availability when you book, these fares may change.
Don't leave everything to the last minute. You're more likely to get cheap tickets from STL to BWI if you book early. Airlines often offer some fantastic early bird rates.
Organise your trip for May. That's the cheapest month for flights from St Louis Airport to Baltimore Washington International Airport. If you're flexible with your dates, try out the 'Whole month' tool to find the lowest price across every month.
Save time looking for cheap flights from STL to BWI by setting up a Price Alert. You'll receive an email or notification on the app when a special offer becomes available.
Tailor your trip using filters. Select your preferred arrival and departure times, total journey duration and airlines. You can also sort the results by 'Cheapest,' 'Best' or 'Fastest' flights from St Louis Airport to Baltimore Washington International Airport.

Handy information about St Louis Airport (STL)

The address for STL is 10701 Lambert International Blvd..
76% of flights leaving from St Louis Airport arrive at their destination on schedule.
St Louis Airport is about 24 kilometres from central St Louis. If you're driving, ride-sharing or catching a taxi from the centre, it'll take 25 minutes or so to get there, depending on the traffic.
The journey when using public transport takes about 30 minutes.
Catching an early flight from St Louis Airport to Baltimore Washington International Airport? Avoid the last-minute rush to the terminal (and get some extra shut-eye) by choosing one of these stays close to STL:

Arriving at Baltimore Washington International Airport (BWI)

The last thing you need is a lengthy trip to your hotel if you're landing late on a St Louis Airport to Baltimore Washington International Airport flight. Reserve one of these accommodation options near BWI instead:
Get your adventure underway by picking up a Baltimore Washington International Airport rental car. Grab your wheels from Dollar, Thrifty or Budget to explore Washington DC and beyond.
Get the best deal by booking your ride from Baltimore Washington International Airport about two weeks ahead of your departure.

When to fly to Baltimore Washington International Airport (BWI)

The quietest month for a flight from St Louis Airport to Baltimore Washington International Airport is March, while July is the busiest. Pick the ideal time to visit Washington DC based on whether you prefer a more relaxed vibe or a faster pace.
The warmest month in Washington DC is July, with temperatures ranging between 19ºC and 33ºC. Book your flights from St Louis Airport to Baltimore Washington International Airport in this month if this is the type of weather you enjoy.
January has average temperatures of between -6ºC and 10ºC. Look for cheap tickets from STL to BWI sometime around then if you like cooler conditions.

Explore more of the United States

New York is just one of the many places in the United States waiting to be explored once you've taken in the sights of Washington DC. Around 322 kilometres away to the north-east, popular attractions include Central Park, Statue of Liberty and Metropolitan Museum of Art.
If there's time to check out another major destination in the United States, consider Philadelphia, roughly 193 kilometres north-east of Washington DC. Independence Hall, Liberty Bell and Philadelphia Museum of Art are the start of reasons to visit.