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Cheap flights from St. Louis to Washington, D.C. 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 St. Louis to Washington, D.C. departing on 12/14. 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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Find the cheapest flights from St. Louis to Washington, D.C.

Cheap round-trip flights

Frontier Logo
4:56 pm - 12:13 amSTL-BWI
6h 17m1 stop
Frontier Logo
5:50 am - 10:12 amBWI-STL
5h 22m1 stop
$143Frontier
Find Deal
Fri, Nov 14 - Sun, Nov 16
Frontier Logo
9:32 pm - 3:17 pmSTL-BWI
16h 45m1 stop
Frontier Logo
6:22 am - 3:04 pmBWI-STL
9h 42m1 stop
$145Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Frontier Logo
6:22 pm - 6:40 pmSTL-BWI
23h 18m1 stop
Frontier Logo
8:21 pm - 9:40 amBWI-STL
14h 19m1 stop
$158Frontier
Find Deal
Thu, Nov 13 - Sun, Nov 16
Frontier Logo
6:42 pm - 9:21 amSTL-BWI
13h 39m1 stop
Frontier Logo
9:42 pm - 9:32 amBWI-STL
12h 50m1 stop
$159Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
Frontier Logo
7:52 pm - 5:44 pmSTL-BWI
20h 52m1 stop
Frontier Logo
9:42 pm - 9:32 amBWI-STL
12h 50m1 stop
$160Frontier
Find Deal
Sat, Oct 25 - Sun, Oct 26
Frontier Logo
10:17 am - 10:18 amSTL-BWI
23h 01m1 stop
Frontier Logo
6:29 pm - 9:07 amBWI-STL
15h 38m1 stop
$172Frontier
Find Deal
Thu, Oct 16 - Mon, Oct 20
Frontier Logo
4:00 pm - 10:20 amSTL-BWI
17h 20m2 stops
Frontier Logo
6:05 am - 10:37 amBWI-STL
5h 32m1 stop
$173Frontier
Find Deal
Mon, Oct 6 - Thu, Oct 9
Multiple Airlines Logo
2:48 pm - 11:54 pmSTL-BWI
8h 06m1 stop
Multiple Airlines Logo
6:00 am - 5:31 pmBWI-STL
12h 31m1 stop
$183Multiple Airlines
Find Deal
Sat, Dec 6 - Sun, Dec 7
Spirit Airlines Logo
12:20 pm - 11:54 pmSTL-BWI
10h 34m1 stop
Spirit Airlines Logo
5:10 am - 11:01 amBWI-STL
6h 51m1 stop
$212Spirit Airlines
Find Deal
Thu, Nov 13 - Sun, Nov 16
Spirit Airlines Logo
12:20 pm - 7:17 pmSTL-BWI
5h 57m1 stop
Spirit Airlines Logo
5:10 am - 11:01 amBWI-STL
6h 51m1 stop
$247Spirit Airlines
Find Deal
Thu, Nov 6 - Sun, Nov 9

Frontier flights from St. Louis to Baltimore

Our best Frontier deals on St. Louis to Baltimore flight tickets
Frontier
Nov 14
STL4:56 pmLambert-St Louis
6h 17m
1 stop
BWI12:13 amBaltimore/Washington
Nov 16
BWI5:50 amBaltimore/Washington
5h 22m
1 stop
STL10:12 amLambert-St Louis
$143
Find similar
Frontier
Oct 2
STL10:49 amLambert-St Louis
6h 04m
1 stop
BWI5:53 pmBaltimore/Washington
Oct 6
BWI6:22 amBaltimore/Washington
9h 42m
1 stop
STL3:04 pmLambert-St Louis
$144
Find similar
Frontier
Oct 3
STL9:32 pmLambert-St Louis
16h 45m
1 stop
BWI3:17 pmBaltimore/Washington
Oct 5
BWI6:22 amBaltimore/Washington
9h 42m
1 stop
STL3:04 pmLambert-St Louis
$145
Find similar

Spirit Airlines flights from St. Louis to Baltimore

Our best Spirit Airlines deals on St. Louis to Baltimore flight tickets
Spirit Airlines
Nov 13
STL12:20 pmLambert-St Louis
10h 34m
1 stop
BWI11:54 pmBaltimore/Washington
Nov 16
BWI5:10 amBaltimore/Washington
6h 51m
1 stop
STL11:01 amLambert-St Louis
$212
Find similar
Spirit Airlines
Nov 6
STL12:20 pmLambert-St Louis
5h 57m
1 stop
BWI7:17 pmBaltimore/Washington
Nov 9
BWI5:10 amBaltimore/Washington
6h 51m
1 stop
STL11:01 amLambert-St Louis
$247
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Baltimore 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 September 23, 2025.
Use the filters below to find and compare flights from St. Louis to Baltimore that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 11/14

4:56 pm-12:13 am

1 stop6h 17m

Baltimore/Washington

Sun 11/16

5:50 am-10:12 am

1 stop5h 22m

$143

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 10/3

9:32 pm-3:17 pm

1 stop16h 45m

Baltimore/Washington

Sun 10/5

6:22 am-3:04 pm

1 stop9h 42m

$145

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 11/13

6:22 pm-6:40 pm

1 stop23h 18m

Baltimore/Washington

Sun 11/16

8:21 pm-9:40 am

1 stop14h 19m

$158

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 10/24

6:42 pm-9:21 am

1 stop13h 39m

Baltimore/Washington

Sun 10/26

9:42 pm-9:32 am

1 stop12h 50m

$159

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sat 10/25

7:52 pm-5:44 pm

1 stop20h 52m

Baltimore/Washington

Sun 10/26

9:42 pm-9:32 am

1 stop12h 50m

$160

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 10/16

10:17 am-10:18 am

1 stop23h 01m

Baltimore/Washington

Mon 10/20

6:29 pm-9:07 am

1 stop15h 38m

$172

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 10/6

4:00 pm-10:20 am

2 stops17h 20m

Baltimore/Washington

Thu 10/9

6:05 am-10:37 am

1 stop5h 32m

$173

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sat 12/6

2:48 pm-11:54 pm

1 stop8h 06m

Baltimore/Washington

Sun 12/7

6:00 am-5:31 pm

1 stop12h 31m

$183

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 11/13

12:20 pm-11:54 pm

1 stop10h 34m

Baltimore/Washington

Sun 11/16

5:10 am-11:01 am

1 stop6h 51m

$212

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 11/6

12:20 pm-7:17 pm

1 stop5h 57m

Baltimore/Washington

Sun 11/9

5:10 am-11:01 am

1 stop6h 51m

$247

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 Washington, D.C. from

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

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 Baltimore?

If you’re not able to fly to Baltimore in March, then September is your next best option. Flight prices from St. Louis to Baltimore during September average around $284.

What is the cheapest day to depart on your flight to Baltimore?

The cheapest day to depart from St. Louis to Baltimore is on a Tuesday. Travelers who choose to depart for Baltimore on a Tuesday will often find tickets for as low as $356. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $470. These prices are subject to change though, so be sure to set up a Price Alert for flights to Baltimore.

What is the cheapest time of day to depart on your flight to Baltimore?

Flying to Baltimore from St. Louis in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $388 when looking at flights departing in the afternoon. Flights in the morning are often more expensive with an average ticket price of $401.

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

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

How far in advance should I book a flight to Baltimore?

You are more likely to see cheaper flights to Baltimore from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Baltimore for around $327 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Baltimore from St. Louis for as low as $257 on momondo.

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

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

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

As of September 2025, prices for St. Louis to Baltimore flights are approximately 9% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Baltimore

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

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

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

Best Price Found

$199

Fastest flight time

1h 55m

Direct flights

Every day

Airports in Baltimore

1 airport
The best one-way flight to Baltimore from St. Louis in the past 72 hours is $199. The best round-trip flight deal from St. Louis to Baltimore found on momondo in the last 72 hours is $305.
The fastest flight from St. Louis to Baltimore takes 1h 55m
Direct flights go from St. Louis to Baltimore every day.
There is 1 airport near Baltimore: Baltimore/Washington (BWI)
Search flight deals

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

    The straight-line distance from Lambert-St Louis to Baltimore/Washington is 730.2 mi. By plane, this route typically takes 5h 57m.

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

    Prices for flights from Lambert-St Louis Airport to Baltimore/Washington Airport are refreshed on a daily basis.

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

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

  • What documentation or ID do you need to fly to Baltimore/Washington Airport?

    The travel and health documents required for your trip to Baltimore/Washington Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Baltimore/Washington Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

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

Best airlines flying from St. Louis to Baltimore

Compare and see reviews for airlines that fly from St. Louis to Baltimore with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $124Free CancellationRating
5.8
3,165 reviews
Search Frontier flights
American AirlinesPriceFrom $196Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $196Free CancellationRating
7.9
7,974 reviews
Search Delta flights
SouthwestPriceFrom $199Free CancellationRating
8.0
4,244 reviews
Search Southwest flights

  • Southwest Flights From St. Louis to Baltimore

    Southwest flies from St. Louis to Baltimore around 26 times per week, with 4,244 momondo users rating the airline 8.0/10. The cheapest Southwest deal from St. Louis to Baltimore in the last 72 hours was $199 (round-trip), much lower than the average airfare cost of $369 for Southwest flights on this route.

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Baltimore. Millions of users trust and use momondo every year so you are in good hands.

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

All flight searches from St. Louis to Baltimore on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Baltimore from St. Louis.

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

If you are not ready to book a flight from St. Louis to Baltimore now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Baltimore and let you know when they change.

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