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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 4/7. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:49 pm - 8:00 am
STL
-
BWI
15h 11m
1 stop
Frontier Logo
6:05 am - 10:37 am
BWI
-
STL
5h 32m
1 stop
$146Frontier
mié., mar. 4 - mié., mar. 11
Frontier Logo
3:49 pm - 8:00 am
STL
-
BWI
15h 11m
1 stop
Frontier Logo
6:05 am - 10:37 am
BWI
-
STL
5h 32m
1 stop
$150Frontier
mié., mar. 4 - mié., mar. 11
Frontier Logo
5:42 pm - 10:41 pm
STL
-
BWI
27h 59m
1 stop
Frontier Logo
6:15 pm - 11:33 pm
BWI
-
STL
6h 18m
1 stop
$151Frontier
jue., feb. 5 - sáb., feb. 7
Frontier Logo
11:32 am - 12:41 am
STL
-
BWI
12h 09m
1 stop
Frontier Logo
5:31 am - 1:34 pm
BWI
-
STL
9h 03m
1 stop
$158Frontier
mié., mar. 18 - lun., mar. 23
Frontier Logo
11:00 am - 6:50 pm
STL
-
BWI
6h 50m
1 stop
Frontier Logo
1:05 pm - 11:33 pm
BWI
-
STL
11h 28m
1 stop
$160Frontier
sáb., feb. 7 - lun., feb. 9
Frontier Logo
11:32 am - 12:41 am
STL
-
BWI
12h 09m
1 stop
Frontier Logo
5:31 am - 1:34 pm
BWI
-
STL
9h 03m
1 stop
$161Frontier
mié., mar. 18 - vie., mar. 20
Frontier Logo
12:12 pm - 10:41 pm
STL
-
BWI
9h 29m
1 stop
Frontier Logo
8:00 am - 11:33 pm
BWI
-
STL
16h 33m
1 stop
$169Frontier
sáb., ene. 31 - mar., feb. 3
Multiple Airlines Logo
5:42 pm - 11:17 am
STL
-
BWI
16h 35m
1 stop
Multiple Airlines Logo
4:44 pm - 11:33 pm
BWI
-
STL
7h 49m
1 stop
$174Multiple Airlines
vie., ene. 30 - sáb., ene. 31
Frontier Logo
8:22 pm - 12:31 am
STL
-
BWI
27h 09m
1 stop
Frontier Logo
6:08 pm - 3:53 pm
BWI
-
STL
46h 45m
2 stops
$180Frontier
lun., feb. 16 - lun., feb. 23
Frontier Logo
2:09 pm - 12:41 am
STL
-
BWI
9h 32m
1 stop
Frontier Logo
5:31 am - 1:34 pm
BWI
-
STL
9h 03m
1 stop
$183Frontier
vie., mar. 6 - vie., mar. 13

Frontier flights from St. Louis to Baltimore

Our best Frontier deals on St. Louis to Baltimore flight tickets
Frontier
Mar 4
STL3:49 pmLambert-St Louis
15h 11m
1 stop
BWI8:00 amBaltimore/Washington
Mar 11
BWI6:05 amBaltimore/Washington
5h 32m
1 stop
STL10:37 amLambert-St Louis
$146
Frontier
Mar 4
STL3:49 pmLambert-St Louis
15h 11m
1 stop
BWI8:00 amBaltimore/Washington
Mar 11
BWI6:05 amBaltimore/Washington
5h 32m
1 stop
STL10:37 amLambert-St Louis
$150
Frontier
Feb 5
STL5:42 pmLambert-St Louis
27h 59m
1 stop
BWI10:41 pmBaltimore/Washington
Feb 7
BWI6:15 pmBaltimore/Washington
6h 18m
1 stop
STL11:33 pmLambert-St Louis
$151

United Airlines flights from St. Louis to Baltimore

Our best United Airlines deals on St. Louis to Baltimore flight tickets
United Airlines
Jan 21
STL1:15 pmLambert-St Louis
7h 06m
1 stop
BWI9:21 pmBaltimore/Washington
Jan 23
BWI5:18 pmBaltimore/Washington
6h 40m
1 stop
STL10:58 pmLambert-St Louis
$361
United Airlines
Feb 3
STL8:05 amLambert-St Louis
5h 06m
1 stop
BWI2:11 pmBaltimore/Washington
Feb 7
BWI5:18 pmBaltimore/Washington
4h 55m
1 stop
STL9:13 pmLambert-St Louis
$421

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 enero 20, 2026.
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

mié. 3/4

3:49 pm-8:00 am

1 stop15h 11m

Baltimore/Washington

mié. 3/11

6:05 am-10:37 am

1 stop5h 32m

$146

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

mié. 3/4

3:49 pm-8:00 am

1 stop15h 11m

Baltimore/Washington

mié. 3/11

6:05 am-10:37 am

1 stop5h 32m

$150

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

jue. 2/5

5:42 pm-10:41 pm

1 stop27h 59m

Baltimore/Washington

sáb. 2/7

6:15 pm-11:33 pm

1 stop6h 18m

$151

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

mié. 3/18

11:32 am-12:41 am

1 stop12h 09m

Baltimore/Washington

lun. 3/23

5:31 am-1:34 pm

1 stop9h 03m

$158

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

sáb. 2/7

11:00 am-6:50 pm

1 stop6h 50m

Baltimore/Washington

lun. 2/9

1:05 pm-11:33 pm

1 stop11h 28m

$160

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

mié. 3/18

11:32 am-12:41 am

1 stop12h 09m

Baltimore/Washington

vie. 3/20

5:31 am-1:34 pm

1 stop9h 03m

$161

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

sáb. 1/31

12:12 pm-10:41 pm

1 stop9h 29m

Baltimore/Washington

mar. 2/3

8:00 am-11:33 pm

1 stop16h 33m

$169

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

vie. 1/30

5:42 pm-11:17 am

1 stop16h 35m

Baltimore/Washington

sáb. 1/31

4:44 pm-11:33 pm

1 stop7h 49m

$174

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

lun. 2/16

8:22 pm-12:31 am

1 stop27h 09m

Baltimore/Washington

lun. 2/23

6:08 pm-3:53 pm

2 stops46h 45m

$180

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

vie. 3/6

2:09 pm-12:41 am

1 stop9h 32m

Baltimore/Washington

vie. 3/13

5:31 am-1:34 pm

1 stop9h 03m

$183

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 April is your next best option. Flight prices from St. Louis to Baltimore during April average around $300.

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 $358. 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 evening are often more expensive with an average ticket price of $404.

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 $346 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 $262 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 January 2026, prices for St. Louis to Baltimore flights are approximately 69% 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

$203

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 $203. The best round-trip flight deal from St. Louis to Baltimore found on momondo in the last 72 hours is $411.
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 in Baltimore. From St. Louis there are direct flights to 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 1h 55m.

  • 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 $140Free CancellationRating
5.7
3,055 reviews
Search Frontier flights
American AirlinesPriceFrom $196Free CancellationRating
7.2
11,169 reviews
Search American Airlines flights
DeltaPriceFrom $196Free CancellationRating
7.9
8,081 reviews
Search Delta flights
SouthwestPriceFrom $207Free CancellationRating
8.0
4,266 reviews
Search Southwest flights

  • Southwest Flights From St. Louis to Baltimore

    Southwest flies from St. Louis to Baltimore around 20 times per week, with 4,266 momondo users rating the airline 8.0/10. The cheapest Southwest deal from St. Louis to Baltimore in the last 72 hours was $207 (round-trip), much lower than the average airfare cost of $379 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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