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

Flights from Baltimore/Washington to Lambert-St Louis have been viewed 15 times in the past calendar month.

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 $112. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and American Airlines, with the lowest prices starting at $154 and $177, respectively. Users have found that Frontier is 67% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Baltimore to St. Louis one-way?

The cheapest airlines for a one-way flight from Baltimore to St. Louis are Frontier ($48), Spirit Airlines ($74), and American Airlines ($89).

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 $305, our data indicates the cheapest price to be $148. The most popular route (Baltimore/Washington - Lambert-St Louis), is priced around $143.

What are the most popular airlines that fly from Baltimore to St. Louis?

Before booking your flight from Baltimore to St. Louis check out the most popular airlines for this route: American Airlines, Delta or Frontier.

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

Users have found that leaving on a Monday can be a cost-effective option. It’s possible to save up to 39% on your flight compared to booking on days when demand is much higher.

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

To save on the cost of your flight from Baltimore to St. Louis, book at least 29 days before your planned departure. Booking around this time can save you about 160% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $414 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $639.

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

August is one of the best times of the year to fly to St. Louis from Baltimore. Prices for August average $329 per person but you can even find prices for as low as $169. The most expensive prices can be found in the month of March. Opting for a August flight can save you 13% on your journey compared to booking in March

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 2 daily flights to St. Louis from 4 different airlines. 2h 10m is how long a flight from Baltimore to Lambert-St Louis will take if you book a nonstop flight.

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.

$48+ Flights from Baltimore to St. Louis

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Baltimore/Washington to Lambert-St Louis are usually found in September or October, booked 83 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Baltimore to St. Louis

Round-trip from	$112 (Priceline)
One-way from	$48 (Priceline)
Popular in	December
Cheapest in	September
Average price	$359

From Baltimore/Washington to Lambert-St Louis

Search Deals

One-way flight from Baltimore/Washington to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($14 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 July 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 July 1, 2025.

Sun 9/76:25 amBWI - STL

1 stop9h 39mFrontier

Mon 9/224:00 pmSTL - BWI

1 stop7h 17mFrontier

Deal found 7/1

$109

Thu 9/186:25 amBWI - STL

1 stop9h 39mMultiple Airlines

Sun 9/212:30 pmSTL - BWI

1 stop6h 38mMultiple Airlines

Deal found 6/30

$136

Thu 8/142:30 pmBWI - STL

1 stop24h 02mSpirit Airlines

Mon 8/182:30 pmSTL - BWI

1 stop6h 39mSpirit Airlines

Deal found 7/1

$152

Tue 8/2612:22 pmBWI - STL

1 stop4h 27mAmerican Airlines

Wed 8/276:06 amSTL - BWI

1 stop4h 46mAmerican Airlines

Deal found 6/30

$177

Thu 8/72:50 pmBWI - STL

Nonstop2h 10mSouthwest

Mon 8/114:15 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/30

$197

Best flights from Baltimore to St. Louis
Discover carefully curated flight deals from Baltimore to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 1, 2025.

Sun 9/76:25 amBWI - STL

1 stop9h 39mFrontier

Mon 9/224:00 pmSTL - BWI

1 stop7h 17mFrontier

Deal found 6/29

$112

Thu 9/186:25 amBWI - STL

1 stop9h 39mMultiple Airlines

Sun 9/212:30 pmSTL - BWI

1 stop6h 38mMultiple Airlines

Deal found 6/30

$136

Sat 8/910:11 pmBWI - STL

1 stop12h 41mSpirit Airlines

Thu 8/142:30 pmSTL - BWI

1 stop6h 39mSpirit Airlines

Deal found 6/30

$154

Tue 8/2612:22 pmBWI - STL

1 stop4h 27mAmerican Airlines

Wed 8/276:06 amSTL - BWI

1 stop4h 46mAmerican Airlines

Deal found 6/30

$177

Thu 8/72:50 pmBWI - STL

Nonstop2h 10mSouthwest

Mon 8/114:15 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/30

$197

Last-minute flights from Baltimore to St. Louis
Discover last-minute flight deals from Baltimore to St. Louis. Data last updated July 1, 2025 and is based on user searches.

Tue 7/82:59 pmBWI - STL

1 stop9h 48mFrontier

Thu 7/102:36 pmSTL - BWI

1 stop8h 49mFrontier

Deal found 6/30

$230

Wed 7/911:53 amBWI - STL

1 stop12h 54mMultiple Airlines

Fri 7/1110:47 amSTL - BWI

1 stop19h 52mMultiple Airlines

Deal found 6/28

$264

Thu 7/102:50 pmBWI - STL

1 stop20h 02mSpirit Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 6/30

$288

Sat 7/267:20 amBWI - STL

1 stop7h 39mFrontier

Thu 7/312:36 pmSTL - BWI

1 stop8h 49mFrontier

Deal found 6/29

$155

Tue 7/296:25 amBWI - STL

1 stop11h 06mSpirit Airlines

Wed 7/3011:24 amSTL - BWI

1 stop11h 25mSpirit Airlines

Deal found 6/29

$174

Wed 7/305:45 amBWI - STL

1 stop5h 44mMultiple Airlines

Thu 7/312:36 pmSTL - BWI

1 stop8h 49mMultiple Airlines

Deal found 6/29

$210

Wed 7/306:40 pmBWI - STL

Nonstop2h 15mSouthwest

Wed 8/69:45 amSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/29

$255

One-way flights from Baltimore to St. Louis
Search for one-way flight options from Baltimore to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 1, 2025.

Sat 7/197:20 amBWI - STL

1 stop7h 39mFrontier

Deal found 6/30

$48

Wed 9/102:30 pmBWI - STL

1 stop24h 05mSpirit Airlines

Deal found 6/30

$74

Tue 8/126:00 amBWI - STL

1 stop4h 29mAmerican Airlines

Deal found 6/30

$89

Tue 8/128:40 pmBWI - STL

Nonstop2h 15mSouthwest

Deal found 6/30

$99

Wed 9/35:40 amBWI - STL

1 stop4h 35mDelta

Deal found 6/30

$104

Thu 7/319:39 amBWI - STL

2 stops10h 02mMultiple Airlines

Deal found 6/30

$128

Cheapflights Fare Finder

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

Sun 9/7

6:25 am-3:04 pm

1 stop9h 39m

Lambert-St Louis

Mon 9/22

4:00 pm-12:17 am

1 stop7h 17m

$109

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 9/18

6:25 am-3:04 pm

1 stop9h 39m

Lambert-St Louis

Sun 9/21

2:30 pm-10:08 pm

1 stop6h 38m

$136

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 8/14

2:30 pm-1:32 pm

1 stop24h 02m

Lambert-St Louis

Mon 8/18

2:30 pm-10:09 pm

1 stop6h 39m

$152

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/26

12:22 pm-3:49 pm

1 stop4h 27m

Lambert-St Louis

Wed 8/27

6:06 am-11:52 am

1 stop4h 46m

$177

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 8/7

2:50 pm-4:00 pm

Nonstop2h 10m

Lambert-St Louis

Mon 8/11

4:15 pm-7:15 pm

Nonstop2h 00m

$197

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 7/19

7:20 am-1:59 pm

1 stop7h 39m

$48

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 10/16

10:46 pm-7:49 am

1 stop10h 03m

$66

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/12

6:00 am-9:29 am

1 stop4h 29m

$89

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/12

8:40 pm-9:55 pm

Nonstop2h 15m

$99

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 11/10

7:40 pm-11:39 pm

1 stop4h 59m

$104

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 11 results

The best insider tips for Baltimore to St. Louis flights

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.

STL

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

Our travel experts

Emily Zemler

Expert on BWI

Taryn White

Expert on STL

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?

To ensure you get the cheapest price possible for a flight from Baltimore to St. Louis, you should look to book at least 83 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?

One of the essential ways to save on airfare from Baltimore to St. Louis is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 20% on airfare.

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

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

Reviews of airlines servicing St. Louis

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

4,273 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,273 reviews

Southwest

8.0

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,973 reviews

Southwest

8.0

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Spirit Airlines

6.3

Okay

8,101 reviews

Southwest

8.0

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Frontier

5.9

Fair

3,289 reviews

Southwest

8.0

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

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 2 daily flights to St. Louis from 4 different airlines. 2h 10m 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 15 times in the past calendar month.
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 $112. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and American Airlines, with the lowest prices starting at $154 and $177, respectively. Users have found that Frontier is 67% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Baltimore to St. Louis one-way?
The cheapest airlines for a one-way flight from Baltimore to St. Louis are Frontier ($48), Spirit Airlines ($74), and American Airlines ($89).
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 $305, our data indicates the cheapest price to be $148. The most popular route (Baltimore/Washington - Lambert-St Louis), is priced around $143.
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

O'Fallon

Maryland Heights

Fairview Heights

Collinsville

Eureka

St. Peters

Glencoe

Alton

Festus

Chesterfield

Farmington

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Top 4 airlines flying from Baltimore to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$108	Average$221	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$158	Average$280	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$169	Average$227	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$201	Average$377	FlexibilityNo cancel fee	On-time63%

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$48+ 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 7/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Baltimore to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Baltimore/Washington to Lambert-St Louis are usually found in September or October, booked 83 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Baltimore to St. Louis

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Baltimore to St. Louis

Cheapest flights from Baltimore to St. LouisExplore 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 July 1, 2025.

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 July 1, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Baltimore to St. Louis that are best for you.

The best insider tips for Baltimore to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Baltimore to St. Louis trip

Airports

BWI

STL

Our travel experts

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.

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 June 27, 2025.

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

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 July 1, 2025.

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 June 29, 2025.

Reviews of airlines servicing St. Louis

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.

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?

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

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

What are the cheapest airlines to fly from Baltimore to St. Louis one-way?

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

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

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

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

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

Traveling to a place near Baltimore?

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Alternative routes for Baltimore to St. Louis

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Top 4 airlines flying from Baltimore to St. Louis

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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 July 1, 2025.