Cheap Flights from Baltimore (BWI) to St. Louis (STL)

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Popular airlines from Baltimore Washington Intl. Airport (BWI) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Baltimore to St. Louis (BWI-STL)

Prices were available within the past 7 days and start at for one-way flights and AED1,120 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tuesday, 28 April, 2026 - Thursday, 30 April, 2026
BWI
Baltimore
STL
St. Louis
AED1,120 Roundtrip, found 4 days ago
AED1,120
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Tuesday, 28 April, 2026 from Baltimore to St. Louis, returning Thursday, 30 April, 2026, priced at AED1,120 found 4 days ago
Frontier Airlines
Tuesday, 28 April, 2026 - Friday, 1 May, 2026
BWI
Baltimore
STL
St. Louis
AED1,330 Roundtrip, found 4 days ago
AED1,330
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Tuesday, 28 April, 2026 from Baltimore to St. Louis, returning Friday, 1 May, 2026, priced at AED1,330 found 4 days ago
Frontier Airlines
Tuesday, 28 April, 2026 - Sunday, 3 May, 2026
BWI
Baltimore
STL
St. Louis
AED1,590 Roundtrip, found 4 days ago
AED1,590
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Tuesday, 28 April, 2026 from Baltimore to St. Louis, returning Sunday, 3 May, 2026, priced at AED1,590 found 4 days ago
Delta
Tuesday, 28 April, 2026 - Tuesday, 5 May, 2026
BWI
Baltimore
STL
St. Louis
AED2,410 Roundtrip, found 4 days ago
AED2,410
Roundtrip
found 4 days ago
Select Delta flight, departing Tuesday, 28 April, 2026 from Baltimore to St. Louis, returning Tuesday, 5 May, 2026, priced at AED2,410 found 4 days ago

Frequently asked questions

Is it cheaper to buy a plane ticket from BWI to Lambert Field last minute?
Being a spontaneous soul is a wonderful way to travel the world, but it isn't always the best way to land a bargain flight. It's better to book your BWI Marshall to Lambert-St. Louis Intl. Airport (STL) journey well ahead of time instead of leaving it to the last minute. Based on flight pricing and demand studies in 2022, we have found that the best time to book domestic flights is between 28 – 35 days ahead of the departure date, and international flights three to four months in advance. We recommend saving that spontaneity for when you're exploring Lambert-St. Louis Intl. Airport (STL)!
What airports do you fly into for St. Louis from Baltimore?
From Baltimore, you can reach St. Louis through Lambert-St. Louis Intl. Airport (STL), Spirit of St. Louis Airport (SUS) and St. Louis Downtown Airport (CPS). Determine which terminal is right for you before you make a decision. If you opt for Lambert-St. Louis Intl. Airport (STL), it's approximately 19 kilometers northwest of downtown. Use the dough you save when booking your fare with Expedia to enjoy the city's well-known attractions, such as Busch Stadium and Gateway Arch.
Can I change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert Field?
Plans can get upended, so Expedia is here to help make amending your flight as easy as possible. To start, find your BWI Airport to Lambert-St. Louis Intl. Airport (STL) itinerary through the Expedia Trips portal and look up the ticket rules regarding changes. If you purchased your airfare in the last 24 hours, some carriers will let you cancel at no cost and organize new flights. If you booked more than 24 hours ago, get in touch with us via our Customer Service portal to run through your options.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
AED1,120
Distance
1177 km
Average flight time
1 hour 52 mins

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