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Cheap flights from St. Louis to Washington, D.C. from $66

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 9/18. 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

Spirit Airlines Logo
2:30 pm - 10:09 pmSTL-BWI
6h 39m1 stop
Spirit Airlines Logo
2:30 pm - 1:32 pmBWI-STL
24h 02m1 stop
$180Spirit Airlines
Find Deal
Mon, Aug 18 - Sat, Aug 23
Spirit Airlines Logo
2:30 pm - 10:09 pmSTL-BWI
6h 39m1 stop
Spirit Airlines Logo
2:30 pm - 1:32 pmBWI-STL
24h 02m1 stop
$189Spirit Airlines
Find Deal
Mon, Aug 25 - Sun, Aug 31
Spirit Airlines Logo
2:30 pm - 10:09 pmSTL-BWI
6h 39m1 stop
Spirit Airlines Logo
2:30 pm - 1:32 pmBWI-STL
24h 02m1 stop
$195Spirit Airlines
Find Deal
Fri, Aug 15 - Sat, Aug 16
Logo
2:30 pm - 10:09 pmSTL-BWI
6h 39m1 stop
Logo
6:27 pm - 9:06 amBWI-STL
15h 39m1 stop
$201
Find Deal
Sun, Aug 31 - Sun, Sep 7
Frontier Logo
7:54 pm - 5:44 pmSTL-BWI
20h 50m1 stop
Frontier Logo
6:50 am - 1:33 pmBWI-STL
7h 43m1 stop
$205Frontier
Find Deal
Wed, Aug 20 - Sat, Aug 23
Frontier Logo
2:52 pm - 11:59 pmSTL-BWI
8h 07m1 stop
Frontier Logo
7:15 am - 1:34 pmBWI-STL
7h 19m1 stop
$208Frontier
Find Deal
Sat, Aug 16 - Sun, Aug 17
Delta Logo
6:40 am - 11:38 amSTL-BWI
3h 58m1 stop
Delta Logo
5:35 am - 9:59 amBWI-STL
5h 24m1 stop
$213Delta
Find Deal
Tue, Sep 9 - Thu, Sep 11
Southwest Logo
2:15 pm - 5:20 pmSTL-BWI
2h 05mnonstop
Southwest Logo
10:10 pm - 11:25 pmBWI-STL
2h 15mnonstop
$217Southwest
Find Deal
Tue, Aug 26 - Thu, Aug 28
Southwest Logo
7:00 am - 10:05 amSTL-BWI
2h 05mnonstop
Southwest Logo
6:30 am - 11:05 amBWI-STL
5h 35m1 stop
$227Southwest
Find Deal
Wed, Aug 27 - Thu, Aug 28
American Airlines Logo
12:51 pm - 8:45 pmSTL-BWI
6h 54m1 stop
American Airlines Logo
8:00 am - 1:14 pmBWI-STL
6h 14m1 stop
$238American Airlines
Find Deal
Fri, Oct 31 - Tue, Nov 4

Frontier flights from St. Louis to Baltimore

Our best Frontier deals on St. Louis to Baltimore flight tickets
Frontier
Aug 9
STL2:52 pmLambert-St Louis
8h 07m
1 stop
BWI11:59 pmBaltimore/Washington
Aug 12
BWI2:59 pmBaltimore/Washington
9h 48m
1 stop
STL11:47 pmLambert-St Louis
$198
Find similar
Frontier
Aug 20
STL7:54 pmLambert-St Louis
20h 50m
1 stop
BWI5:44 pmBaltimore/Washington
Aug 23
BWI6:50 amBaltimore/Washington
7h 43m
1 stop
STL1:33 pmLambert-St Louis
$205
Find similar
Frontier
Aug 16
STL2:52 pmLambert-St Louis
8h 07m
1 stop
BWI11:59 pmBaltimore/Washington
Aug 17
BWI7:15 amBaltimore/Washington
7h 19m
1 stop
STL1:34 pmLambert-St Louis
$208
Find similar

Southwest flights from St. Louis to Baltimore

Our best Southwest deals on St. Louis to Baltimore flight tickets
Southwest
Aug 26
STL2:15 pmLambert-St Louis
2h 05m
BWI5:20 pmBaltimore/Washington
Aug 28
BWI10:10 pmBaltimore/Washington
2h 15m
STL11:25 pmLambert-St Louis
$217
Find similar
Southwest
Aug 27
STL7:00 amLambert-St Louis
2h 05m
BWI10:05 amBaltimore/Washington
Aug 28
BWI6:30 amBaltimore/Washington
5h 35m
1 stop
STL11:05 amLambert-St Louis
$227
Find similar
Southwest
Sep 6
STL5:55 pmLambert-St Louis
2h 00m
BWI8:55 pmBaltimore/Washington
Sep 8
BWI10:20 amBaltimore/Washington
2h 10m
STL11:30 amLambert-St Louis
$242
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 August 4, 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

Mon 8/18

2:30 pm-10:09 pm

1 stop6h 39m

Baltimore/Washington

Sat 8/23

2:30 pm-1:32 pm

1 stop24h 02m

$180

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 8/25

2:30 pm-10:09 pm

1 stop6h 39m

Baltimore/Washington

Sun 8/31

2:30 pm-1:32 pm

1 stop24h 02m

$189

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 8/15

2:30 pm-10:09 pm

1 stop6h 39m

Baltimore/Washington

Sat 8/16

2:30 pm-1:32 pm

1 stop24h 02m

$195

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sun 8/31

2:30 pm-10:09 pm

1 stop6h 39m

Baltimore/Washington

Sun 9/7

6:27 pm-9:06 am

1 stop15h 39m

$201

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 8/20

7:54 pm-5:44 pm

1 stop20h 50m

Baltimore/Washington

Sat 8/23

6:50 am-1:33 pm

1 stop7h 43m

$205

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sat 8/16

2:52 pm-11:59 pm

1 stop8h 07m

Baltimore/Washington

Sun 8/17

7:15 am-1:34 pm

1 stop7h 19m

$208

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Tue 9/9

6:40 am-11:38 am

1 stop3h 58m

Baltimore/Washington

Thu 9/11

5:35 am-9:59 am

1 stop5h 24m

$213

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Tue 8/26

2:15 pm-5:20 pm

Nonstop2h 05m

Baltimore/Washington

Thu 8/28

10:10 pm-11:25 pm

Nonstop2h 15m

$217

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 8/27

7:00 am-10:05 am

Nonstop2h 05m

Baltimore/Washington

Thu 8/28

6:30 am-11:05 am

1 stop5h 35m

$227

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 10/31

12:51 pm-8:45 pm

1 stop6h 54m

Baltimore/Washington

Tue 11/4

8:00 am-1:14 pm

1 stop6h 14m

$238

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 September, then March is your next best option. Flight prices from St. Louis to Baltimore during March average around $282.

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 $357. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $455. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $392 when looking at flights departing at noon. Flights in the morning are often more expensive with an average ticket price of $405.

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 $323 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 $239 on momondo.

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

There are 1 cabin classes 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.

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

You could potentially save up to 49% on your flight if you consider stops on a St. Louis to Baltimore flight.

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

As of August 2025, prices for St. Louis to Baltimore flights are approximately 63% cheaper 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

$66

Fastest flight time

2h 00m

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 $66. The best round-trip flight deal from St. Louis to Baltimore found on momondo in the last 72 hours is $180.
The fastest flight from St. Louis to Baltimore takes 2h 00m
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 2h 00m.

  • 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
3,232 reviews
Search Frontier flights
DeltaPriceFrom $176Free CancellationRating
8.0
7,987 reviews
Search Delta flights
American AirlinesPriceFrom $196Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $199Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

  • Southwest Flights From St. Louis to Baltimore

    Southwest flies from St. Louis to Baltimore around 11 times per week, with 4,246 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 $375 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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