$76 Cheap Flights from Baltimore (BWI) to St. Louis (STL)

View $76 flight on Sat, Oct 11, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $76 for one-way flights and $151 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 15 - Sat, Oct 18
BWI
Baltimore
STL
St. Louis
$151 Roundtrip, found 2 hours ago
$151
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Oct 15 from Baltimore to St. Louis, returning Sat, Oct 18, priced at $151 found 2 hours ago
Frontier Airlines
Thu, Oct 30 - Tue, Nov 4
BWI
Baltimore
STL
St. Louis
$153 Roundtrip, found 1 day ago
$153
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Oct 30 from Baltimore to St. Louis, returning Tue, Nov 4, priced at $153 found 1 day ago
Frontier Airlines
Sun, Sep 28 - Thu, Oct 2
BWI
Baltimore
STL
St. Louis
$154 Roundtrip, just found
$154
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Sep 28 from Baltimore to St. Louis, returning Thu, Oct 2, priced at $154 just found
American Airlines
Thu, Nov 6 - Fri, Nov 7
BWI
Baltimore
STL
St. Louis
$157 Roundtrip, found 2 days ago
$157
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Nov 6 from Baltimore to St. Louis, returning Fri, Nov 7, priced at $157 found 2 days ago
United
Wed, Oct 8 - Mon, Oct 13
BWI
Baltimore
STL
St. Louis
$158 Roundtrip, found 1 day ago
$158
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 8 from Baltimore to St. Louis, returning Mon, Oct 13, priced at $158 found 1 day ago
American Airlines
Tue, Dec 16 - Wed, Dec 31
BWI
Baltimore
STL
St. Louis
$159 Roundtrip, just found
$159
Roundtrip
just found
Select American Airlines flight, departing Tue, Dec 16 from Baltimore to St. Louis, returning Wed, Dec 31, priced at $159 just found
Frontier Airlines
Mon, Oct 6 - Tue, Oct 7
BWI
Baltimore
STL
St. Louis
$162 Roundtrip, just found
$162
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Oct 6 from Baltimore to St. Louis, returning Tue, Oct 7, priced at $162 just found
United
Sat, Oct 18 - Thu, Oct 23
BWI
Baltimore
STL
St. Louis
$168 Roundtrip, found 1 day ago
$168
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 18 from Baltimore to St. Louis, returning Thu, Oct 23, priced at $168 found 1 day ago
Spirit Airlines
Thu, Dec 4 - Sat, Dec 6
BWI
Baltimore
STL
St. Louis
$172 Roundtrip, found 1 hour ago
$172
Roundtrip
found 1 hour ago
Select Spirit Airlines flight, departing Thu, Dec 4 from Baltimore to St. Louis, returning Sat, Dec 6, priced at $172 found 1 hour ago
Delta
Mon, Nov 24 - Fri, Nov 28
BWI
Baltimore
STL
St. Louis
$179 Roundtrip, found 21 hours ago
$179
Roundtrip
found 21 hours ago
Select Delta flight, departing Mon, Nov 24 from Baltimore to St. Louis, returning Fri, Nov 28, priced at $179 found 21 hours ago

Find the cheapest month to fly from Baltimore (BWI) to St. Louis (STL)

November is typically the cheapest month to fly

From $154 - $490 per traveler.
Flights from Baltimore (BWI) to St. Louis (STL)
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$150
Distance
735 mi
Average flight time
2 hours 26 mins

Baltimore to St. Louis Flights

The cheapest times to fly from Baltimore to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Baltimore to St. Louis are during the month of October. You can find some of the cheapest flights from Baltimore to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Baltimore to St. Louis

Sunday is one of the best days to book for cheap flights from Baltimore to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Baltimore to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Baltimore to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $76 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Baltimore to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Baltimore to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $76 or cheap return flight from $151 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
October is the most affordable month to fly from BWI to STL. Planning your trip for the off-season is often the key to finding better fares.
Which airlines fly direct from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
You can fly directly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL) on a Southwest Airlines flight.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from BWI to STL, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
With, on average, 2 nonstop flights that operate from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL) every day, you'll be on your way in no time.
What are the most popular departure times for flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
Flights between BWI and STL tend to be busiest at 6 AM. If you're after a quieter experience and possibly cheaper fares, choose a time outside the usual busy windows.
What day of the week has the most flights from BWI to STL?
If you fly on a Friday, you'll get the biggest range of options for flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
The first flight of the day out of Baltimore Washington Intl. Thurgood Marshall Airport (BWI) is at around 6:30AM UTC-5. Board this flight and you'll reach Lambert-St. Louis Intl. Airport (STL) at approximately 8:05AM UTC-6. The overall travel time is 2h 35m.
How long does it take to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
Flights from BWI to STL have an average travel time of 2 hours and 29 minutes. The total distance between the two is 740 mi.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for St. Louis from Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Lambert-St. Louis Intl. Airport (STL) is the only airport in St. Louis with direct flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI). Check out the available options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until just before your departure to book your flight from BWI to STL generally means paying more. While you may find some last-minute offers, they're not always guaranteed. Keep your travel schedule open to maximize your chances of getting a bargain.
Is it cheaper to book a BWI to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a BWI to STL flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place will take the hassle out of planning your trip. Simply secure your flights and select from our extensive range of hotels, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Lambert-St. Louis Intl. Airport (STL)?
Generally, it's possible to cancel or reschedule your BWI to STL flight. However, for bookings made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.