Cheap flights from Washington, D.C. to St. Louis from $72

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. 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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Find the cheapest flights from Washington, D.C. to St. Louis (WAS-STL)

Cheap round-trip flights

Frontier Logo
6:22 am - 3:04 pmBWI-STL
9h 42m1 stop
Frontier Logo
1:52 pm - 3:17 pmSTL-BWI
24h 25m1 stop
$143Frontier
Find Deal
dom., sep. 7 - dom., sep. 21
Frontier Logo
6:22 am - 3:04 pmBWI-STL
9h 42m1 stop
Frontier Logo
10:39 am - 6:00 pmSTL-BWI
6h 21m1 stop
$149Frontier
Find Deal
jue., sep. 11 - dom., sep. 14
American Airlines Logo
8:00 am - 1:14 pmBWI-STL
6h 14m1 stop
American Airlines Logo
6:52 am - 1:51 pmSTL-BWI
5h 59m1 stop
$217American Airlines
Find Deal
mar., nov. 18 - mié., nov. 19
American Airlines Logo
6:35 am - 11:51 amDCA-STL
6h 16m1 stop
American Airlines Logo
1:28 pm - 4:35 pmSTL-DCA
2h 07mnonstop
$244American Airlines
Find Deal
mié., oct. 8 - mié., oct. 8
United Airlines Logo
8:40 am - 10:02 amIAD-STL
2h 22mnonstop
United Airlines Logo
8:15 am - 11:25 amSTL-IAD
2h 10mnonstop
$245United Airlines
Find Deal
mié., sep. 10 - jue., sep. 11
United Airlines Logo
8:40 am - 10:02 amIAD-STL
2h 22mnonstop
United Airlines Logo
5:30 pm - 12:32 amSTL-IAD
6h 02m1 stop
$247United Airlines
Find Deal
mié., sep. 10 - mié., sep. 10
Southwest Logo
3:45 pm - 6:35 pmDCA-STL
3h 50m1 stop
Southwest Logo
3:20 pm - 6:15 pmSTL-DCA
1h 55mnonstop
$251Southwest
Find Deal
mar., oct. 28 - lun., nov. 3
Delta Logo
7:05 am - 10:26 amIAD-STL
4h 21m1 stop
Delta Logo
6:40 am - 11:29 amSTL-IAD
3h 49m1 stop
$257Delta
Find Deal
mié., oct. 8 - mar., oct. 14
Delta Logo
10:11 am - 4:06 pmDCA-STL
6h 55m1 stop
Delta Logo
6:40 am - 11:34 amSTL-DCA
3h 54m1 stop
$257Delta
Find Deal
mar., sep. 9 - mié., sep. 10
Southwest Logo
12:00 pm - 1:35 pmDCA-STL
2h 35mnonstop
Southwest Logo
7:40 am - 4:15 pmSTL-DCA
7h 35m2 stops
$260Southwest
Find Deal
mié., ene. 7 - sáb., ene. 10

American Airlines flights from Washington, D.C. to St. Louis

Our best American Airlines deals on Washington, D.C. to St. Louis flight tickets
American Airlines
Nov 18
BWI8:00 amBaltimore/Washington
6h 14m
1 stop
STL1:14 pmLambert-St Louis
Nov 19
STL6:52 amLambert-St Louis
5h 59m
1 stop
BWI1:51 pmBaltimore/Washington
American Airlines
Oct 8
DCA6:35 amWashington, D.C. Reagan-National
6h 16m
1 stop
STL11:51 amLambert-St Louis
Oct 8
STL1:28 pmLambert-St Louis
2h 07m
DCA4:35 pmWashington, D.C. Reagan-National
American Airlines
Sep 16
DCA5:00 amWashington, D.C. Reagan-National
5h 16m
1 stop
STL9:16 amLambert-St Louis
Sep 23
STL10:54 amLambert-St Louis
2h 04m
DCA1:58 pmWashington, D.C. Reagan-National

Frontier flights from Washington, D.C. to St. Louis

Our best Frontier deals on Washington, D.C. to St. Louis flight tickets
Frontier
Sep 7
BWI6:22 amBaltimore/Washington
9h 42m
1 stop
STL3:04 pmLambert-St Louis
Sep 21
STL1:52 pmLambert-St Louis
24h 25m
1 stop
BWI3:17 pmBaltimore/Washington
Frontier
Sep 11
BWI6:22 amBaltimore/Washington
9h 42m
1 stop
STL3:04 pmLambert-St Louis
Sep 14
STL10:39 amLambert-St Louis
6h 21m
1 stop
BWI6:00 pmBaltimore/Washington
Frontier
Sep 19
BWI6:27 pmBaltimore/Washington
15h 39m
1 stop
STL9:06 amLambert-St Louis
Sep 22
STL4:00 pmLambert-St Louis
7h 17m
1 stop
BWI12:17 amBaltimore/Washington

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to St. Louis 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 agosto 21, 2025.
Use the filters below to find and compare flights from Washington, D.C. to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

dom. 9/7

6:22 am-3:04 pm

1 stop9h 42m

Lambert-St Louis

dom. 9/21

1:52 pm-3:17 pm

1 stop24h 25m

$143

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

jue. 9/11

6:22 am-3:04 pm

1 stop9h 42m

Lambert-St Louis

dom. 9/14

10:39 am-6:00 pm

1 stop6h 21m

$149

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

mar. 11/18

8:00 am-1:14 pm

1 stop6h 14m

Lambert-St Louis

mié. 11/19

6:52 am-1:51 pm

1 stop5h 59m

$217

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mié. 10/8

6:35 am-11:51 am

1 stop6h 16m

Lambert-St Louis

mié. 10/8

1:28 pm-4:35 pm

Nonstop2h 07m

$244

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mié. 9/10

8:40 am-10:02 am

Nonstop2h 22m

Lambert-St Louis

jue. 9/11

8:15 am-11:25 am

Nonstop2h 10m

$245

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mié. 9/10

8:40 am-10:02 am

Nonstop2h 22m

Lambert-St Louis

mié. 9/10

5:30 pm-12:32 am

1 stop6h 02m

$247

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 10/28

3:45 pm-6:35 pm

1 stop3h 50m

Lambert-St Louis

lun. 11/3

3:20 pm-6:15 pm

Nonstop1h 55m

$251

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mié. 10/8

7:05 am-10:26 am

1 stop4h 21m

Lambert-St Louis

mar. 10/14

6:40 am-11:29 am

1 stop3h 49m

$257

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 9/9

10:11 am-4:06 pm

1 stop6h 55m

Lambert-St Louis

mié. 9/10

6:40 am-11:34 am

1 stop3h 54m

$257

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mié. 1/7

12:00 pm-1:35 pm

Nonstop2h 35m

Lambert-St Louis

sáb. 1/10

7:40 am-4:15 pm

2 stops7h 35m

$260

Flights are sorted by cheapest round-trip flights first.

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See travel insights to St. Louis from

How to get the cheapest flight ticket from Washington, D.C. 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 typical price of a round-trip flight between Washington, D.C. and St. Louis?

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

In general, August is the cheapest month to fly from Washington, D.C. to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $277. The month of May is another great option to travel to St. Louis, with average flight prices from Washington, D.C. averaging around $297.

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 $348. 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 $403. 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 Washington, D.C. 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 $386 per ticket.

What is the cheapest Washington, D.C. to Lambert-St Louis flight route?

Fly from Washington, D.C. Reagan-National to Lambert-St Louis for the best Washington, D.C. - 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 Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $415 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Washington, D.C. for as low as $315 on momondo.

What cabin class options are available on Washington, D.C. to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on Washington, D.C. 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 Washington, D.C. to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Washington, D.C. to St. Louis.

How have Washington, D.C. to St. Louis flight prices changed over time?

As of August 2025, prices for Washington, D.C. to St. Louis flights are approximately 22% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. to St. Louis

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

Cheap Washington, D.C. to St. Louis (WAS to STL) flight deals and tips

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

Best Price Found

$158

Fastest flight time

2h 10m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Washington, D.C. in the past 72 hours is $158. The best round-trip flight deal from Washington, D.C. to St. Louis found on momondo in the last 72 hours is $219.
The fastest flight from Washington, D.C. to St. Louis takes 2h 10m
Direct flights go from Washington, D.C. to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
  • How far is Washington, D.C. to Lambert-St Louis by plane?

    There are 708.3 mi between Washington, D.C. and Lambert-St Louis. 2h 10m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Washington, D.C. to Lambert-St Louis Airport?

    Prices for flights from Washington, D.C. to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Washington, D.C. to Lambert-St Louis Airport?

  • How old do you have to be to fly from Washington, D.C. to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. 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 Washington, D.C. to St. Louis?

  • What is the most popular airline from Washington, D.C. to St. Louis?

Best airlines flying from Washington, D.C. to St. Louis

Compare and see reviews for airlines that fly from Washington, D.C. to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $108Free CancellationRating
5.8
3,207 reviews
Search Frontier flights
American AirlinesPriceFrom $158Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $169Free CancellationRating
7.9
7,981 reviews
Search Delta flights
SouthwestPriceFrom $188Free CancellationRating
8.0
4,245 reviews
Search Southwest flights
United AirlinesPriceFrom $253Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights
  • Southwest Flights From Washington, D.C. to St. Louis

    Southwest operates around 24 flights from Washington, D.C. to St. Louis every week. The average price of these flights found in the last 72 hours has been $344, but momondo users have found Southwest deals from Washington, D.C. to St. Louis from as low as $188 round-trip. Southwest has been scored 8.0/10 in 4,245 reviews.

  • United Airlines Flights From Washington, D.C. to St. Louis

    United Airlines (7.4/10 from 8,930 reviews) operates around 14 flights from Washington, D.C. to St. Louis in any given week. The average United Airlines airfare for this route is around $475, with deals from around $253 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. to St. Louis flight searches in the last 72 hours.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Festus
Farmington
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to St. Louis?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Washington, D.C..

Can I find flights from Washington, D.C. to St. Louis with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington, D.C. to St. Louis flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to St. Louis?

momondo helps you find the best flight between Washington, D.C. and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Washington, D.C. and alert you when they 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.

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1 adult
mar. 8/26
mar. 9/2

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