What is the cheapest airline that flies from Baltimore/Washington to Lambert-St Louis?

Frontier, Spirit Airlines, and American Airlines are the most popular carriers operating from Baltimore/Washington to Lambert-St Louis

Which layover airport offers the lowest fares from Baltimore to St. Louis?

Flights via Orlando (MCO) offer the lowest average round-trip price of $110.

How many flights depart from Baltimore to St. Louis on average per week?

The number of flights available between Baltimore and St. Louis is 23 per week as of September 2025. The most frequent departure day is Mon, with 22% of weekly flights leaving on this day.

How many flights depart from Baltimore to St. Louis on average per day?

The number of flights available between Baltimore and St. Louis is 3 per day as of September 2025. The most frequent departure time is 6:00AM, with 54% of daily flights leaving at noon.

What airlines fly to St. Louis?

Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to St. Louis from Baltimore according to our data. Southwest is the first choice among our users, with 50% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Which airport is the most popular layover for flights between Baltimore and St. Louis?

Atlanta (ATL) was the most common stop: 73% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Baltimore to St. Louis?

Atlanta (ATL) has the shortest average layover time for this route: 0h 56m.

Which layover airport has the shortest travel time from Baltimore to St. Louis?

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 4h 20m.

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?

As of September 2025, there are 4 operators available to choose from 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.

$71 Cheap Flights from Baltimore to St. Louis in 2025

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Find the cheapest flights from Baltimore to St. Louis

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:22 am - 3:04 pmBWI-STL

9h 42m1 stop

1:57 pm - 3:29 pmSTL-BWI

24h 32m1 stop

$143Frontier

Find Deal

Thu, Sep 18 - Fri, Sep 19

11:33 am - 6:02 pmBWI-STL

7h 29m1 stop

6:05 pm - 10:20 amSTL-BWI

15h 15m1 stop

$144Frontier

Find Deal

Sat, Oct 18 - Mon, Oct 20

6:22 am - 3:04 pmBWI-STL

9h 42m1 stop

4:00 pm - 12:17 amSTL-BWI

7h 17m1 stop

$145Frontier

Find Deal

Mon, Sep 15 - Thu, Sep 18

6:27 pm - 9:06 amBWI-STL

15h 39m1 stop

4:00 pm - 12:17 amSTL-BWI

7h 17m1 stop

$154Frontier

Find Deal

Fri, Sep 26 - Mon, Sep 29

6:22 am - 3:04 pmBWI-STL

9h 42m1 stop

1:57 pm - 3:29 pmSTL-BWI

24h 32m1 stop

$155Frontier

Find Deal

Thu, Sep 18 - Fri, Sep 19

6:27 pm - 9:06 amBWI-STL

15h 39m1 stop

4:00 pm - 12:17 amSTL-BWI

7h 17m1 stop

$156Frontier

Find Deal

Fri, Sep 26 - Mon, Sep 29

6:00 am - 3:34 pmBWI-STL

10h 34m1 stop

2:12 pm - 10:20 amSTL-BWI

19h 08m1 stop

$157Frontier

Find Deal

Fri, Nov 14 - Mon, Nov 17

6:27 pm - 9:06 amBWI-STL

15h 39m1 stop

10:39 am - 6:00 pmSTL-BWI

6h 21m1 stop

$158Frontier

Find Deal

Fri, Sep 26 - Sun, Sep 28

4:00 pm - 9:40 amBWI-STL

18h 40m1 stop

4:00 pm - 12:17 amSTL-BWI

7h 17m1 stop

$190

Find Deal

Wed, Oct 1 - Thu, Oct 2

5:10 am - 11:01 amBWI-STL

6h 51m1 stop

12:20 pm - 11:54 pmSTL-BWI

10h 34m1 stop

$202Spirit Airlines

Find Deal

Thu, Dec 4 - Sun, Dec 7

Frontier flights from Baltimore to St. Louis

Our best Frontier deals on Baltimore to St. Louis flight tickets

Frontier

Sep 18

BWI6:22 amBaltimore/Washington

9h 42m

1 stop

STL3:04 pmLambert-St Louis

Sep 19

STL1:57 pmLambert-St Louis

24h 32m

1 stop

BWI3:29 pmBaltimore/Washington

$143

Find similar

Frontier

Oct 18

BWI11:33 amBaltimore/Washington

7h 29m

1 stop

STL6:02 pmLambert-St Louis

Oct 20

STL6:05 pmLambert-St Louis

15h 15m

1 stop

BWI10:20 amBaltimore/Washington

$144

Find similar

Frontier

Sep 15

BWI6:22 amBaltimore/Washington

9h 42m

1 stop

STL3:04 pmLambert-St Louis

Sep 18

STL4:00 pmLambert-St Louis

7h 17m

1 stop

BWI12:17 amBaltimore/Washington

$145

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 9/18

6:22 am-3:04 pm

1 stop9h 42m

Lambert-St Louis

Fri 9/19

1:57 pm-3:29 pm

1 stop24h 32m

$143

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 10/18

11:33 am-6:02 pm

1 stop7h 29m

Lambert-St Louis

Mon 10/20

6:05 pm-10:20 am

1 stop15h 15m

$144

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 9/15

6:22 am-3:04 pm

1 stop9h 42m

Lambert-St Louis

Thu 9/18

4:00 pm-12:17 am

1 stop7h 17m

$145

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 9/26

6:27 pm-9:06 am

1 stop15h 39m

Lambert-St Louis

Mon 9/29

4:00 pm-12:17 am

1 stop7h 17m

$154

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 9/18

6:22 am-3:04 pm

1 stop9h 42m

Lambert-St Louis

Fri 9/19

1:57 pm-3:29 pm

1 stop24h 32m

$155

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 9/26

6:27 pm-9:06 am

1 stop15h 39m

Lambert-St Louis

Mon 9/29

4:00 pm-12:17 am

1 stop7h 17m

$156

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 11/14

6:00 am-3:34 pm

1 stop10h 34m

Lambert-St Louis

Mon 11/17

2:12 pm-10:20 am

1 stop19h 08m

$157

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 9/26

6:27 pm-9:06 am

1 stop15h 39m

Lambert-St Louis

Sun 9/28

10:39 am-6:00 pm

1 stop6h 21m

$158

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 10/1

4:00 pm-9:40 am

1 stop18h 40m

Lambert-St Louis

Thu 10/2

4:00 pm-12:17 am

1 stop7h 17m

$190

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 12/4

5:10 am-11:01 am

1 stop6h 51m

Lambert-St Louis

Sun 12/7

12:20 pm-11:54 pm

1 stop10h 34m

$202

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Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Layovers

Other information

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

In general, September 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 $248. The month of October is another great option to travel to St. Louis, with average flight prices from Baltimore averaging around $298.

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 Wednesday when prices can be found for as low as $343. 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 $415. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $312 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $383 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 $349 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 $219 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?

You could potentially save up to 8% on your flight if you consider stops on a Baltimore to St. Louis flight.

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

As of September 2025, prices for Baltimore to St. Louis flights are approximately 41% more expensive 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	$239
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 $239. The best round-trip flight deal from Baltimore to St. Louis found on momondo in the last 72 hours is $270.

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 near St. Louis: 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 4h 54m.
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?
As of September 2025, there are 4 operators available to choose from 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?
Based on momondo bookings for flights between Baltimore and St. Louis, the leading plane model is Boeing 737-800 Passenger/BBJ2 (winglets), making up 25.42% of the total bookings. Other popular models include Boeing 737 MAX 8 with 23.00%, Boeing 737-700 Passenger/BBJ1 (winglets) with 14.29%, and Canadair (Bombardier) Regional Jet CRJ-550 with 6.54%.
What is the most popular airline from Baltimore to St. Louis?
momondo data reveals that the most frequently booked airline on the route from Baltimore to St. Louis is Southwest, representing 70% of all bookings. The subsequent popular airlines are Frontier at 13%, Delta at 11%, and American Airlines at 7%.

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
Frontier	PriceFrom $108	Free Cancellation	Rating 5.8 3,195 reviews	Search Frontier flights
American Airlines	PriceFrom $167	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $169	Free Cancellation	Rating 7.9 7,977 reviews	Search Delta flights
Southwest	PriceFrom $200	Free Cancellation	Rating 8.0 4,241 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 23 flights/week on average for this route. A good Southwest flight deal for Baltimore to St. Louis starts from $200 round-trip, up to an average price of $374. Our users have rated Southwest at 8.0/10.

St. Charles

Chesterfield

Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Fenton

Collinsville

Wentzville

Alton

St. Peters

Farmington

Festus

Glencoe

Clayton

Edwardsville

Eureka

Litchfield

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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Cheap flights from Baltimore to St. Louis from $71

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 10/9. 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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Frontier flights from Baltimore to St. Louis

Our best Frontier deals on Baltimore to St. Louis flight tickets

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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?

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

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

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?

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?

You could potentially save up to 8% on your flight if you consider stops on a Baltimore to St. Louis flight.

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

As of September 2025, prices for Baltimore to St. Louis flights are approximately 41% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Baltimore/Washington to Lambert-St Louis?

Frontier, Spirit Airlines, and American Airlines are the most popular carriers operating from Baltimore/Washington to Lambert-St Louis

What airlines fly to St. Louis?

Which airport is the most popular layover for flights between Baltimore and St. Louis?

Atlanta (ATL) was the most common stop: 73% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Baltimore to St. Louis?

Flights via Orlando (MCO) offer the lowest average round-trip price of $110.

Which layover airport has the shortest travel time from Baltimore to St. Louis?

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 4h 20m.

Which layover airport has the shortest connection time from Baltimore to St. Louis?

Atlanta (ATL) has the shortest average layover time for this route: 0h 56m.

How many flights depart from Baltimore to St. Louis on average per day?

The number of flights available between Baltimore and St. Louis is 3 per day as of September 2025. The most frequent departure time is 6:00AM, with 54% of daily flights leaving at noon.

How many flights depart from Baltimore to St. Louis on average per week?

The number of flights available between Baltimore and St. Louis is 23 per week as of September 2025. The most frequent departure day is Mon, with 22% of weekly flights leaving on this day.

When to book flights from Baltimore to St. Louis

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

Fastest flight time

Direct flights

Airports in St. Louis

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

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

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?

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

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

Southwest Flights From Baltimore to St. Louis

Traveling to a place near St. Louis?

Why use momondo?

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

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

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

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

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Missouri