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Cheap flights from Baltimore to St. Louis from $59

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Baltimore to St. Louis departing on 3/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Baltimore to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:53 pm - 11:49 am
BWI
-
STL
18h 56m
1 stop
Frontier Logo
2:09 pm - 2:24 pm
STL
-
BWI
23h 15m
1 stop
$121Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
6:50 pm - 6:51 am
BWI
-
STL
13h 01m
1 stop
Frontier Logo
8:17 pm - 5:13 pm
STL
-
BWI
19h 56m
1 stop
$130Frontier
Sun, Feb 22 - Wed, Feb 25
Frontier Logo
5:53 pm - 11:49 am
BWI
-
STL
18h 56m
1 stop
Frontier Logo
2:09 pm - 2:24 pm
STL
-
BWI
23h 15m
1 stop
$132Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
6:00 am - 6:51 am
BWI
-
STL
25h 51m
1 stop
Frontier Logo
8:22 pm - 5:13 pm
STL
-
BWI
19h 51m
1 stop
$133Frontier
Thu, Feb 19 - Mon, Feb 23
Frontier Logo
5:53 pm - 11:49 am
BWI
-
STL
18h 56m
1 stop
Frontier Logo
2:09 pm - 2:24 pm
STL
-
BWI
23h 15m
1 stop
$139Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
5:58 pm - 6:51 am
BWI
-
STL
13h 53m
1 stop
Frontier Logo
3:49 pm - 8:00 am
STL
-
BWI
15h 11m
1 stop
$141Frontier
Tue, Feb 24 - Wed, Feb 25
Frontier Logo
6:00 am - 6:51 am
BWI
-
STL
25h 51m
1 stop
Frontier Logo
8:22 pm - 5:13 pm
STL
-
BWI
19h 51m
1 stop
$142Frontier
Thu, Feb 19 - Mon, Feb 23
Multiple Airlines Logo
12:30 pm - 6:51 am
BWI
-
STL
19h 21m
2 stops
Multiple Airlines Logo
8:17 pm - 12:31 am
STL
-
BWI
27h 14m
1 stop
$145Multiple Airlines
Tue, Feb 17 - Wed, Feb 18
Frontier Logo
5:54 pm - 6:51 am
BWI
-
STL
13h 57m
1 stop
Frontier Logo
3:49 pm - 7:30 pm
STL
-
BWI
26h 41m
1 stop
$146Frontier
Tue, Feb 17 - Tue, Feb 24
Frontier Logo
2:58 pm - 11:59 pm
BWI
-
STL
10h 01m
1 stop
Frontier Logo
3:49 pm - 8:00 am
STL
-
BWI
15h 11m
1 stop
$149Frontier
Mon, Feb 23 - Wed, Feb 25

Frontier flights from Baltimore to St. Louis

Our best Frontier deals on Baltimore to St. Louis flight tickets
Frontier
Mar 5
BWI5:53 pmBaltimore/Washington
18h 56m
1 stop
STL11:49 amLambert-St Louis
Mar 9
STL2:09 pmLambert-St Louis
23h 15m
1 stop
BWI2:24 pmBaltimore/Washington
$121
Frontier
Feb 22
BWI6:50 pmBaltimore/Washington
13h 01m
1 stop
STL6:51 amLambert-St Louis
Feb 25
STL8:17 pmLambert-St Louis
19h 56m
1 stop
BWI5:13 pmBaltimore/Washington
$130
Frontier
Mar 5
BWI5:53 pmBaltimore/Washington
18h 56m
1 stop
STL11:49 amLambert-St Louis
Mar 9
STL2:09 pmLambert-St Louis
23h 15m
1 stop
BWI2:24 pmBaltimore/Washington
$132

Delta flights from Baltimore to St. Louis

Our best Delta deals on Baltimore to St. Louis flight tickets
Delta
Mar 25
BWI11:52 amBaltimore/Washington
7h 01m
1 stop
STL5:53 pmLambert-St Louis
Mar 26
STL6:00 amLambert-St Louis
6h 31m
1 stop
BWI1:31 pmBaltimore/Washington
$197
Delta
Feb 18
BWI7:06 pmBaltimore/Washington
5h 30m
1 stop
STL11:36 pmLambert-St Louis
Feb 20
STL6:47 pmLambert-St Louis
4h 48m
1 stop
BWI12:35 amBaltimore/Washington
$205
Delta
Feb 6
BWI6:59 pmBaltimore/Washington
5h 38m
1 stop
STL11:37 pmLambert-St Louis
Feb 7
STL5:04 pmLambert-St Louis
6h 37m
1 stop
BWI12:41 amBaltimore/Washington
$314

momondo 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, momondo users made 832,500 searches. Data last updated February 5, 2026.
Use the filters below to find and compare flights from Baltimore to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 3/5

5:53 pm-11:49 am

1 stop18h 56m

Lambert-St Louis

Mon 3/9

2:09 pm-2:24 pm

1 stop23h 15m

$121

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sun 2/22

6:50 pm-6:51 am

1 stop13h 01m

Lambert-St Louis

Wed 2/25

8:17 pm-5:13 pm

1 stop19h 56m

$130

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 3/5

5:53 pm-11:49 am

1 stop18h 56m

Lambert-St Louis

Mon 3/9

2:09 pm-2:24 pm

1 stop23h 15m

$132

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/19

6:00 am-6:51 am

1 stop25h 51m

Lambert-St Louis

Mon 2/23

8:22 pm-5:13 pm

1 stop19h 51m

$133

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 3/5

5:53 pm-11:49 am

1 stop18h 56m

Lambert-St Louis

Mon 3/9

2:09 pm-2:24 pm

1 stop23h 15m

$139

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 2/24

5:58 pm-6:51 am

1 stop13h 53m

Lambert-St Louis

Wed 2/25

3:49 pm-8:00 am

1 stop15h 11m

$141

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/19

6:00 am-6:51 am

1 stop25h 51m

Lambert-St Louis

Mon 2/23

8:22 pm-5:13 pm

1 stop19h 51m

$142

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 2/17

12:30 pm-6:51 am

2 stops19h 21m

Lambert-St Louis

Wed 2/18

8:17 pm-12:31 am

1 stop27h 14m

$145

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 2/17

5:54 pm-6:51 am

1 stop13h 57m

Lambert-St Louis

Tue 2/24

3:49 pm-7:30 pm

1 stop26h 41m

$146

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 2/23

2:58 pm-11:59 pm

1 stop10h 01m

Lambert-St Louis

Wed 2/25

3:49 pm-8:00 am

1 stop15h 11m

$149

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Baltimore to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to St. Louis?

In general, October is the cheapest month to fly from Baltimore to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $174. The month of September is another great option to travel to St. Louis, with average flight prices from Baltimore averaging around $228.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Saturday when prices can be found for as low as $329. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $405. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Baltimore in the evening is the least expensive time of day to depart. momondo users have found prices as low as $308 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $378 per ticket.

What is the cheapest Baltimore/Washington to Lambert-St Louis flight route?

Fly from Baltimore/Washington to Lambert-St Louis for the best Baltimore/Washington - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Baltimore when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $354 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Baltimore for as low as $212 on momondo.

What cabin class options are available on Baltimore/Washington to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Baltimore/Washington to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Baltimore to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Baltimore to St. Louis.

How have Baltimore to St. Louis flight prices changed over time?

As of February 2026, prices for Baltimore to St. Louis flights are approximately 69% cheaper when compared to flights at the same time last year.

When to book flights from Baltimore to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Baltimore to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Baltimore to St. Louis (BWI to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Baltimore to St. Louis

Best Price Found

$233

Fastest flight time

2h 10m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Baltimore in the past 72 hours is $233. The best round-trip flight deal from Baltimore to St. Louis found on momondo in the last 72 hours is $372.
The fastest flight from Baltimore to St. Louis takes 2h 10m
Direct flights go from Baltimore to St. Louis every day.
There is 1 airport in St. Louis. From Baltimore there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Baltimore/Washington to Lambert-St Louis by plane?

    There are 730.2 mi between Baltimore/Washington and Lambert-St Louis. A reasonable flight in good conditions will take 2h 10m.

  • When did momondo last update prices for flights from Baltimore/Washington Airport to Lambert-St Louis Airport?

    Prices for flights from Baltimore/Washington Airport to Lambert-St Louis Airport refresh daily.

  • How many operators does momondo search for flights from Baltimore/Washington Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Baltimore/Washington Airport to Lambert-St Louis Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Baltimore/Washington Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Baltimore to St. Louis?

  • What is the most popular airline from Baltimore to St. Louis?

Best airlines flying from Baltimore to St. Louis

Compare and see reviews for airlines that fly from Baltimore to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $116Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
DeltaPriceFrom $130Free CancellationRating
7.9
8,146 reviews
Search Delta flights
American AirlinesPriceFrom $178Free CancellationRating
7.2
11,222 reviews
Search American Airlines flights
SouthwestPriceFrom $197Free CancellationRating
8.0
4,274 reviews
Search Southwest flights

  • Southwest Flights From Baltimore to St. Louis

    Southwest is one of the most popular airlines flying from Baltimore to St. Louis, operating 18 flights/week on average for this route. A good Southwest flight deal for Baltimore to St. Louis starts from $197 round-trip, up to an average price of $376. Our users have rated Southwest at 8.0/10.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Baltimore to St. Louis?

It is quick and easy to find Baltimore to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from Baltimore to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from Baltimore which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Baltimore to St. Louis?

Once you have performed a search for Baltimore to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Baltimore to St. Louis right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Baltimore to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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