$55 Cheap Flights from St. Louis (STL) to Baltimore (BWI)

View $55 flight on Thu, Jan 22, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $55 for one-way flights and $110 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Jan 8 - Sat, Jan 10
STL
St. Louis
BWI
Baltimore
$110 Roundtrip, found 2 hours ago
$110
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Thu, Jan 8 from St. Louis to Baltimore, returning Sat, Jan 10, priced at $110 found 2 hours ago
Frontier Airlines
Thu, Jan 22 - Thu, Jan 29
STL
St. Louis
BWI
Baltimore
$120 Roundtrip, just found
$120
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Jan 22 from St. Louis to Baltimore, returning Thu, Jan 29, priced at $120 just found
Frontier Airlines
Thu, Nov 20 - Thu, Nov 27
STL
St. Louis
BWI
Baltimore
$127 Roundtrip, found 3 hours ago
$127
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Thu, Nov 20 from St. Louis to Baltimore, returning Thu, Nov 27, priced at $127 found 3 hours ago
Frontier Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
BWI
Baltimore
$128 Roundtrip, found 8 hours ago
$128
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Thu, Dec 11 from St. Louis to Baltimore, returning Mon, Dec 15, priced at $128 found 8 hours ago
Frontier Airlines
Fri, Dec 5 - Mon, Dec 8
STL
St. Louis
BWI
Baltimore
$134 Roundtrip, found 1 hour ago
$134
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, Dec 5 from St. Louis to Baltimore, returning Mon, Dec 8, priced at $134 found 1 hour ago
Frontier Airlines
Fri, Dec 5 - Sun, Dec 7
STL
St. Louis
BWI
Baltimore
$138 Roundtrip, found 1 hour ago
$138
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, Dec 5 from St. Louis to Baltimore, returning Sun, Dec 7, priced at $138 found 1 hour ago
Spirit Airlines
Thu, Nov 20 - Thu, Dec 4
STL
St. Louis
BWI
Baltimore
$139 Roundtrip, found 15 hours ago
$139
Roundtrip
found 15 hours ago
Select Spirit Airlines flight, departing Thu, Nov 20 from St. Louis to Baltimore, returning Thu, Dec 4, priced at $139 found 15 hours ago
American Airlines
Thu, Dec 25 - Thu, Jan 8
STL
St. Louis
BWI
Baltimore
$145 Roundtrip, found 2 days ago
$145
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Dec 25 from St. Louis to Baltimore, returning Thu, Jan 8, priced at $145 found 2 days ago
United
Wed, Dec 24 - Wed, Jan 7
STL
St. Louis
BWI
Baltimore
$243 Roundtrip, found 2 days ago
$243
Roundtrip
found 2 days ago
Select United flight, departing Wed, Dec 24 from St. Louis to Baltimore, returning Wed, Jan 7, priced at $243 found 2 days ago
Southwest Airlines
Fri, Jan 16 - Mon, Jan 19
STL
St. Louis
BWI
Baltimore
$255 Roundtrip, found 4 days ago
$255
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Fri, Jan 16 from St. Louis to Baltimore, returning Mon, Jan 19, priced at $255 found 4 days ago

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

October is typically the cheapest month to fly

From $154 - $454 per traveler.

Alternative airports near Baltimore

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Average driving time to city center is 57 minutes. Flights from $363
DCA
Ronald Reagan Washington National
Average driving time to city center57 min
Flights from $363

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) cost?
Grab a cheap one-way flight from $55 or cheap return flight from $110 from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
The cheapest month to fly from STL to BWI is January, when demand is low. Off-peak months are usually when you'll find lower airfares between these airports.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
You can fly directly from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) on a Southwest Airlines flight.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll fly you from STL to BWI. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
With an average of 2 nonstop flights departing from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) every day, you'll be on your way in no time.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Flights between STL and BWI tend to be busiest at 6 AM. If you're after a more relaxed experience and possibly cheaper prices, look for a time when demand is lower.
What day of the week has the most flights from STL to BWI?
Friday has the most flights from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI). Consider traveling on this day and you'll have a greater chance of finding a schedule that works for you.
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Lambert-St. Louis Intl. Airport (STL)'s earliest flight to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) leaves at approximately 5:35AM UTC-6. With a total travel time of 2h 5m, you'll touch down at around 8:40AM UTC-5.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Flights from STL to BWI have an average travel time of 1 hour and 59 minutes. The distance between these two airports is 740 mi.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) route, aim to fly before 3 PM. Later flights have a 22% higher chance of cancellation.**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 Baltimore from Lambert-St. Louis Intl. Airport (STL)?
Hop on a direct flight from Lambert-St. Louis Intl. Airport (STL) to Baltimore and you'll land at any one of these hubs:

  • Ronald Reagan Washington National Airport (DCA)
  • Washington Dulles Intl. Airport (IAD)
  • Baltimore Washington Intl. Thurgood Marshall Airport (BWI)

Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) last-minute?
Booking your ticket from STL to BWI shortly before your trip is generally more expensive. However, if you're flexible with your travel dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a STL to BWI flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to BWI flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one convenient place will take the stress out of planning your trip. Just secure your flights and select from our wide range of hotels, then tailor your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Generally, it's possible to reschedule or cancel your STL to BWI flight. However, if the booking was 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 whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

0
Origin airport
Lambert-St. Louis Intl.
Destination airport
Baltimore Washington Intl. Thurgood Marshall
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$110
Distance
735 mi

Book with confidence

St. Louis to Baltimore Flights

The cheapest times to fly from St. Louis to Baltimore

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 St. Louis to Baltimore are during the month of January. You can find some of the cheapest flights from St. Louis to Baltimore with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Baltimore: 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 St. Louis to Baltimore

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 St. Louis to Baltimore in 2025. You can also book with separate airlines for your outbound and return journeys, from $55 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 St. Louis to Baltimore 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 St. Louis to Baltimore 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.

 

St. Louis to Baltimore Flights

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*Available to One Key members.