Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Washington, D.C. to St. Louis from $59

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 3/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Washington, D.C. to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:53 pm - 11:49 am
BWI
-
STL
18h 56m
1 stop
Frontier Logo
2:09 pm - 2:24 pm
STL
-
BWI
23h 15m
1 stop
$121Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
6:50 pm - 6:51 am
BWI
-
STL
13h 01m
1 stop
Frontier Logo
8:17 pm - 5:13 pm
STL
-
BWI
19h 56m
1 stop
$130Frontier
Sun, Feb 22 - Wed, Feb 25
Frontier Logo
5:53 pm - 11:49 am
BWI
-
STL
18h 56m
1 stop
Frontier Logo
2:09 pm - 2:24 pm
STL
-
BWI
23h 15m
1 stop
$132Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
6:00 am - 6:51 am
BWI
-
STL
25h 51m
1 stop
Frontier Logo
8:22 pm - 5:13 pm
STL
-
BWI
19h 51m
1 stop
$133Frontier
Thu, Feb 19 - Mon, Feb 23
Multiple Airlines Logo
12:30 pm - 6:51 am
BWI
-
STL
19h 21m
2 stops
Multiple Airlines Logo
8:17 pm - 12:31 am
STL
-
BWI
27h 14m
1 stop
$145Multiple Airlines
Tue, Feb 17 - Wed, Feb 18
American Airlines Logo
7:51 pm - 9:37 pm
DCA
-
STL
2h 46mnonstop
American Airlines Logo
6:06 am - 9:12 am
STL
-
DCA
2h 06mnonstop
$264American Airlines
Wed, Mar 4 - Sat, Mar 7
United Airlines Logo
8:40 am - 10:13 am
IAD
-
STL
2h 33mnonstop
United Airlines Logo
8:25 am - 11:31 am
STL
-
IAD
2h 06mnonstop
$264United Airlines
Wed, Mar 4 - Wed, Jul 1
United Airlines Logo
6:45 pm - 8:23 pm
IAD
-
STL
2h 38mnonstop
United Airlines Logo
8:17 am - 4:09 pm
STL
-
IAD
6h 52m
1 stop
$266United Airlines
Wed, Mar 4 - Wed, Mar 11
Multiple Airlines Logo
5:39 pm - 6:51 am
IAD
-
STL
14h 12m
1 stop
Multiple Airlines Logo
3:49 pm - 2:18 pm
STL
-
IAD
21h 29m
2 stops
$269Multiple Airlines
Sun, Feb 22 - Thu, Mar 5
American Airlines Logo
7:30 am - 9:06 am
DCA
-
STL
2h 36mnonstop
American Airlines Logo
1:36 pm - 9:30 pm
STL
-
DCA
6h 54m
1 stop
$274American Airlines
Wed, Mar 4 - Sat, Mar 7

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

Our best Frontier deals on Washington, D.C. to St. Louis flight tickets
Frontier
Mar 5
BWI5:53 pmBaltimore/Washington
18h 56m
1 stop
STL11:49 amLambert-St Louis
Mar 9
STL2:09 pmLambert-St Louis
23h 15m
1 stop
BWI2:24 pmBaltimore/Washington
$121
Frontier
Feb 22
BWI6:50 pmBaltimore/Washington
13h 01m
1 stop
STL6:51 amLambert-St Louis
Feb 25
STL8:17 pmLambert-St Louis
19h 56m
1 stop
BWI5:13 pmBaltimore/Washington
$130
Frontier
Mar 5
BWI5:53 pmBaltimore/Washington
18h 56m
1 stop
STL11:49 amLambert-St Louis
Mar 9
STL2:09 pmLambert-St Louis
23h 15m
1 stop
BWI2:24 pmBaltimore/Washington
$132

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

Our best Southwest deals on Washington, D.C. to St. Louis flight tickets
Southwest
Mar 4
DCA11:00 amWashington, D.C. Reagan-National
7h 05m
2 stops
STL5:05 pmLambert-St Louis
Mar 11
STL4:00 pmLambert-St Louis
6h 15m
1 stop
DCA11:15 pmWashington, D.C. Reagan-National
$281
Southwest
Mar 8
DCA8:00 amWashington, D.C. Reagan-National
2h 30m
STL9:30 amLambert-St Louis
Mar 14
STL9:35 pmLambert-St Louis
9h 40m
1 stop
DCA8:15 amWashington, D.C. Reagan-National
$284
Southwest
Apr 16
DCA12:15 pmWashington, D.C. Reagan-National
2h 20m
STL1:35 pmLambert-St Louis
Apr 20
STL8:35 amLambert-St Louis
2h 00m
DCA11:35 amWashington, D.C. Reagan-National
$291

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 February 5, 2026.
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

Thu 3/5

5:53 pm-11:49 am

1 stop18h 56m

Lambert-St Louis

Mon 3/9

2:09 pm-2:24 pm

1 stop23h 15m

$121

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sun 2/22

6:50 pm-6:51 am

1 stop13h 01m

Lambert-St Louis

Wed 2/25

8:17 pm-5:13 pm

1 stop19h 56m

$130

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 3/5

5:53 pm-11:49 am

1 stop18h 56m

Lambert-St Louis

Mon 3/9

2:09 pm-2:24 pm

1 stop23h 15m

$132

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/19

6:00 am-6:51 am

1 stop25h 51m

Lambert-St Louis

Mon 2/23

8:22 pm-5:13 pm

1 stop19h 51m

$133

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 2/17

12:30 pm-6:51 am

2 stops19h 21m

Lambert-St Louis

Wed 2/18

8:17 pm-12:31 am

1 stop27h 14m

$145

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 3/4

7:51 pm-9:37 pm

Nonstop2h 46m

Lambert-St Louis

Sat 3/7

6:06 am-9:12 am

Nonstop2h 06m

$264

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 3/4

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Wed 7/1

8:25 am-11:31 am

Nonstop2h 06m

$264

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 3/4

6:45 pm-8:23 pm

Nonstop2h 38m

Lambert-St Louis

Wed 3/11

8:17 am-4:09 pm

1 stop6h 52m

$266

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sun 2/22

5:39 pm-6:51 am

1 stop14h 12m

Lambert-St Louis

Thu 3/5

3:49 pm-2:18 pm

2 stops21h 29m

$269

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 3/4

7:30 am-9:06 am

Nonstop2h 36m

Lambert-St Louis

Sat 3/7

1:36 pm-9:30 pm

1 stop6h 54m

$274

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $273. The month of October is another great option to travel to St. Louis, with average flight prices from Washington, D.C. averaging around $293.

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 Saturday when prices can be found for as low as $329. 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 $405. 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. in the evening is the least expensive time of day to depart. momondo users have found prices as low as $308 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $378 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

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 February 2026, prices for Washington, D.C. to St. Louis flights are approximately 47% 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

$148

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 $148. The best round-trip flight deal from Washington, D.C. to St. Louis found on momondo in the last 72 hours is $305.
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 in St. Louis. From Washington, D.C. there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • 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 $78Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
DeltaPriceFrom $124Free CancellationRating
7.9
8,151 reviews
Search Delta flights
American AirlinesPriceFrom $167Free CancellationRating
7.2
11,237 reviews
Search American Airlines flights
SouthwestPriceFrom $185Free CancellationRating
8.0
4,275 reviews
Search Southwest flights
United AirlinesPriceFrom $233Free CancellationRating
7.4
9,240 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 $358, but momondo users have found Southwest deals from Washington, D.C. to St. Louis from as low as $185 round-trip. Southwest has been scored 8.0/10 in 4,275 reviews.

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

    United Airlines (7.4/10 from 9,240 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 $455, with deals from around $233 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
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 3/7
Sat 3/14
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States