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$72+ Cheap flights from Baltimore to St. Louis (BWI - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — STL
oct. 15 — oct. 221
mer. 10/15
mer. 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Baltimore/Washington to Lambert-St Louis are usually found in September or October, booked 70 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Baltimore to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Baltimore (BWI) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated septembre 15, 2025.

Round-trip from

$143
(CheapOair)

One-way from

$72
(Priceline)

Popular in

December

Cheapest in

September

Average price

$247
From Baltimore/Washington to Lambert-St Louis
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One-way flight from Baltimore/Washington to Lambert-St Louis
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Highest demand for flights based on searches. 3% potential increase in price ($11 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Baltimore to St. Louis

Cheapest flights from Baltimore to St. Louis
Explore the most affordable flight options available from Baltimore to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septembre 15, 2025.

This Gotogate deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 10/1110:16 amBWI - STL
1 stop6h 22mFrontier
lun. 10/139:06 pmSTL - BWI
1 stop12h 14mFrontier
Deal found 9/13$143
This Frontier deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 9/216:22 amBWI - STL
1 stop9h 42mFrontier
lun. 9/224:00 pmSTL - BWI
1 stop7h 17mFrontier
Deal found 9/13$144
This Frontier deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 11/136:15 amBWI - STL
1 stop4h 57mFrontier
ven. 11/144:56 pmSTL - BWI
1 stop6h 17mFrontier
Deal found 9/13$145
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 9/256:22 amBWI - STL
1 stop9h 42mFrontier
lun. 9/294:00 pmSTL - BWI
1 stop26h 07mFrontier
Deal found 9/13$150
This CheapOair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 10/96:05 amBWI - STL
1 stop5h 32mFrontier
dim. 10/126:05 pmSTL - BWI
1 stop13h 29mFrontier
Deal found 9/14$157
This CheapOair deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 10/106:09 pmBWI - STL
1 stop24h 53mFrontier
lun. 10/206:05 pmSTL - BWI
1 stop15h 15mFrontier
Deal found 9/13$158
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/116:00 amBWI - STL
1 stop4h 35mAmerican Airlines
mer. 11/126:04 pmSTL - BWI
1 stop4h 31mAmerican Airlines
Deal found 9/14$159
This Booking.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 9/259:37 pmBWI - STL
1 stop16h 25mFrontier
dim. 9/2810:39 amSTL - BWI
1 stop6h 21mFrontier
Deal found 9/15$160
This CheapOair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 11/75:50 amBWI - STL
1 stop11h 11mFrontier
dim. 11/911:23 amSTL - BWI
1 stop27h 12mFrontier
Deal found 9/14$163
This CheapOair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 10/118:01 pmBWI - STL
1 stop17h 45mFrontier
jeu. 10/1610:17 amSTL - BWI
1 stop23h 01mFrontier
Deal found 9/14$169
This Priceline deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/66:22 amBWI - STL
1 stop9h 42mMultiple Airlines
jeu. 10/910:57 amSTL - BWI
1 stop9h 21mMultiple Airlines
Deal found 9/15$170

Cheapflights Fare Finder

 
Customize your flight search to find flights from Baltimore to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septembre 15, 2025.
Use the filters below to find and compare flights from Baltimore to St. Louis that are best for you.

Fly from

Baltimore

Fly to

St. Louis

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

jeu. 10/23

6:05 am-10:37 am

1 stop5h 32m

Lambert-St Louis

lun. 10/27

6:05 pm-10:20 am

1 stop15h 15m

$143

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

mar. 11/4

4:44 pm-10:04 pm

1 stop6h 20m

Lambert-St Louis

ven. 11/7

5:15 pm-12:41 am

1 stop6h 26m

$197

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

sam. 10/11

6:00 am-12:35 pm

1 stop7h 35m

Lambert-St Louis

mer. 10/15

1:40 pm-6:41 pm

1 stop4h 01m

$197

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

sam. 11/15

10:55 am-2:25 pm

1 stop4h 30m

Lambert-St Louis

mar. 11/18

10:00 am-5:14 pm

1 stop6h 14m

$221

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

mer. 11/12

10:56 am-3:49 pm

1 stop5h 53m

Lambert-St Louis

lun. 11/17

10:00 am-5:14 pm

1 stop6h 14m

$221

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

ven. 10/17

8:21 pm-6:10 pm

1 stop22h 49m

Lambert-St Louis

lun. 10/20

8:21 pm-10:20 am

2 stops12h 59m

$240

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

jeu. 10/30

7:45 am-12:50 pm

1 stop6h 05m

Lambert-St Louis

mar. 11/4

6:05 am-9:05 am

Nonstop2h 00m

$257

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

ven. 11/21

10:56 am-3:46 pm

1 stop5h 50m

Lambert-St Louis

lun. 11/24

10:00 am-5:14 pm

1 stop6h 14m

$258

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

ven. 10/10

9:29 am-5:10 pm

2 stops8h 41m

Lambert-St Louis

lun. 10/13

9:06 pm-10:20 am

1 stop12h 14m

$261

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

jeu. 11/13

9:55 pm-11:15 pm

Nonstop2h 20m

Lambert-St Louis

sam. 11/15

5:45 pm-8:40 pm

Nonstop1h 55m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 20 results
1
2

The best insider tips for Baltimore to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Baltimore to St. Louis trip
Airports
BWI

For early morning flights, arrive 20-30 minutes early due to busy security lines from 6-8 a.m. on weekdays.

Read more about BWIby Emily Zemler
STL

Use the MetroLink light rail for a convenient and economical trip from STL to downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
Our travel experts
Emily Zemler

Emily Zemler

Expert on BWI

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Best time to book a flight from Baltimore to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Baltimore with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Baltimore to St. Louis

How far ahead should I book a flight from Baltimore to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Baltimore to St. Louis. Price data was last updated on September 12, 2025.

To ensure you get the cheapest price possible for a flight from Baltimore to St. Louis, you should look to book at least 70 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Baltimore to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Baltimore to St. Louis (average of $311). Flying from Baltimore to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BWI to STL?

Find hourly flight availability from Baltimore to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septembre 15, 2025.

One of the essential ways to save on airfare from Baltimore to St. Louis is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 13% on airfare.

What is the cheapest day to fly from Baltimore to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Baltimore to St. Louis. Price data was last updated on September 7, 2025.

Travelers seeking maximum savings on their Baltimore to St. Louis flight should consider departing on Tuesday mornings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated septembre 15, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and American Airlines from Baltimore to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Baltimore to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Baltimore to St. Louis?

    Lambert-St Louis is the airport most travelers will use when flying to St. Louis from Baltimore/Washington. Booking flights from Baltimore/Washington (BWI) to Lambert-St Louis (STL) should be relatively easy as there are 3 daily flights to St. Louis from 4 different airlines. 2h 15m is how long a flight from Baltimore to Lambert-St Louis will take if you book a nonstop flight.

  • How popular is this Baltimore to St. Louis flight route?

    Flights from Baltimore/Washington to Lambert-St Louis have been viewed 20 times in the past calendar month.

  • How long is the flight from Baltimore to St. Louis?

    For as low as $221, Frontier can have you in St. Louis from Baltimore in 4h 30m. Airlines will cover a distance of 736 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Baltimore to St. Louis round-trip?

    Flying on Frontier is currently your cheapest option to St. Louis, with prices starting at $108. Additional round-trip tickets that might be worth considering are offered by American Airlines and Delta, with the lowest prices starting at $167 and $169, respectively. Users have found that Frontier is 68% cheaper than the other options available to this destination.

  • What are the cheapest flights from Baltimore to St. Louis?

    Looking for the cheapest flight from Baltimore to St. Louis? While on average our users pay $286, our data indicates the cheapest price to be $96. The most popular route (Baltimore/Washington - Lambert-St Louis), is priced around $177.

  • Can I find deals for flights from Baltimore to St. Louis that include hotel bookings?

    Yes. In addition to deals on Baltimore to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Baltimore to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Baltimore to St. Louis.

  • Can I find deals for business class flights from Baltimore to St. Louis?

    Yes. Cheapflights offers flight deals from Baltimore to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Baltimore to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Baltimore to St. Louis (average of $311). Flying from Baltimore to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Baltimore to St. Louis

Discover the top 4 airlines that operate flights from Baltimore to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$109Average$179FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$167Average$277FlexibilityNo cancel feeOn-time71%
DeltaCheapest$169Average$212FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$199Average$373FlexibilityNo cancel feeOn-time63%

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