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Cheap flights from Washington, D.C. to St. Louis from $60

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 1/6. 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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:02 pm - 8:05 am
BWI
-
STL
20h 03m1 stop
Frontier Logo
5:11 pm - 10:36 pm
STL
-
BWI
28h 25m1 stop
$142Frontier
dom., ene. 11 - lun., ene. 12
Multiple Airlines Logo
4:44 pm - 11:33 pm
BWI
-
STL
7h 49m1 stop
Multiple Airlines Logo
8:22 pm - 12:21 am
STL
-
BWI
26h 59m1 stop
$143Multiple Airlines
vie., ene. 23 - lun., ene. 26
Southwest Logo
3:35 pm - 7:00 pm
DCA
-
STL
4h 25m1 stop
Southwest Logo
6:20 am - 3:25 pm
STL
-
DCA
8h 05m2 stops
$260Southwest
mar., ene. 13 - mié., ene. 14
American Airlines Logo
7:40 am - 9:24 am
DCA
-
STL
2h 44mnonstop
American Airlines Logo
5:59 pm - 9:10 pm
STL
-
DCA
2h 11mnonstop
$261American Airlines
jue., ene. 15 - dom., ene. 18
Southwest Logo
11:00 am - 5:05 pm
DCA
-
STL
7h 05m2 stops
Southwest Logo
6:00 am - 2:15 pm
STL
-
DCA
7h 15m2 stops
$265Southwest
mar., ene. 13 - mié., ene. 14
United Airlines Logo
8:40 am - 10:13 am
IAD
-
STL
2h 33mnonstop
United Airlines Logo
8:30 am - 11:40 am
STL
-
IAD
2h 10mnonstop
$265United Airlines
mar., ene. 13 - mar., ene. 20
Delta Logo
8:35 pm - 8:53 am
DCA
-
STL
13h 18m1 stop
Delta Logo
6:00 am - 11:20 am
STL
-
DCA
4h 20m1 stop
$270Delta
lun., ene. 12 - dom., ene. 18
American Airlines Logo
9:35 am - 1:03 pm
DCA
-
STL
4h 28m1 stop
American Airlines Logo
9:54 am - 12:59 pm
STL
-
DCA
2h 05mnonstop
$271American Airlines
jue., ene. 15 - dom., ene. 18
United Airlines Logo
5:38 pm - 11:59 pm
IAD
-
STL
7h 21m1 stop
United Airlines Logo
8:30 am - 11:40 am
STL
-
IAD
2h 10mnonstop
$271United Airlines
jue., ene. 15 - dom., ene. 18
Delta Logo
8:35 pm - 8:53 am
DCA
-
STL
13h 18m1 stop
Delta Logo
9:59 am - 3:00 pm
STL
-
DCA
4h 01m1 stop
$274Delta
lun., ene. 26 - sáb., ene. 31

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
Jan 15
DCA7:40 amWashington, D.C. Reagan-National
2h 44m
STL9:24 amLambert-St Louis
Jan 18
STL5:59 pmLambert-St Louis
2h 11m
DCA9:10 pmWashington, D.C. Reagan-National
$261
Find similar
American Airlines
Jan 15
DCA9:35 amWashington, D.C. Reagan-National
4h 28m
1 stop
STL1:03 pmLambert-St Louis
Jan 18
STL9:54 amLambert-St Louis
2h 05m
DCA12:59 pmWashington, D.C. Reagan-National
$271
Find similar
American Airlines
Jan 16
DCA7:40 amWashington, D.C. Reagan-National
2h 44m
STL9:24 amLambert-St Louis
Jan 18
STL6:00 amLambert-St Louis
2h 03m
DCA9:03 amWashington, D.C. Reagan-National
$272
Find similar

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

Our best Frontier deals on Washington, D.C. to St. Louis flight tickets
Frontier
Jan 11
BWI1:02 pmBaltimore/Washington
20h 03m
1 stop
STL8:05 amLambert-St Louis
Jan 12
STL5:11 pmLambert-St Louis
28h 25m
1 stop
BWI10:36 pmBaltimore/Washington
$142
Find similar
Frontier
Jan 29
BWI1:22 pmBaltimore/Washington
11h 11m
1 stop
STL11:33 pmLambert-St Louis
Jan 31
STL11:00 amLambert-St Louis
6h 50m
1 stop
BWI6:50 pmBaltimore/Washington
$145
Find similar
Frontier
Jan 22
BWI6:00 amBaltimore/Washington
18h 33m
2 stops
STL11:33 pmLambert-St Louis
Jan 26
STL8:22 pmLambert-St Louis
26h 59m
1 stop
BWI12:21 amBaltimore/Washington
$159
Find similar

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 diciembre 17, 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. 1/11

1:02 pm-8:05 am

1 stop20h 03m

Lambert-St Louis

lun. 1/12

5:11 pm-10:36 pm

1 stop28h 25m

$142

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

vie. 1/23

4:44 pm-11:33 pm

1 stop7h 49m

Lambert-St Louis

lun. 1/26

8:22 pm-12:21 am

1 stop26h 59m

$143

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 1/13

3:35 pm-7:00 pm

1 stop4h 25m

Lambert-St Louis

mié. 1/14

6:20 am-3:25 pm

2 stops8h 05m

$260

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 1/15

7:40 am-9:24 am

Nonstop2h 44m

Lambert-St Louis

dom. 1/18

5:59 pm-9:10 pm

Nonstop2h 11m

$261

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 1/13

11:00 am-5:05 pm

2 stops7h 05m

Lambert-St Louis

mié. 1/14

6:00 am-2:15 pm

2 stops7h 15m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

mar. 1/13

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

mar. 1/20

8:30 am-11:40 am

Nonstop2h 10m

$265

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

lun. 1/12

8:35 pm-8:53 am

1 stop13h 18m

Lambert-St Louis

dom. 1/18

6:00 am-11:20 am

1 stop4h 20m

$270

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 1/15

9:35 am-1:03 pm

1 stop4h 28m

Lambert-St Louis

dom. 1/18

9:54 am-12:59 pm

Nonstop2h 05m

$271

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

jue. 1/15

5:38 pm-11:59 pm

1 stop7h 21m

Lambert-St Louis

dom. 1/18

8:30 am-11:40 am

Nonstop2h 10m

$271

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

lun. 1/26

8:35 pm-8:53 am

1 stop13h 18m

Lambert-St Louis

sáb. 1/31

9:59 am-3:00 pm

1 stop4h 01m

$274

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 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 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 $270. 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 $344. 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 $409. 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 $312 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 $380 per ticket.

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

Fly from Washington, D.C. Dulles Intl 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 $393 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 $191 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?

You could potentially save up to 10% on your flight if you consider stops on a Washington, D.C. to St. Louis flight.

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

As of December 2025, prices for Washington, D.C. to St. Louis flights are approximately 52% more expensive 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

$173

Fastest flight time

2h 15m

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 $173. The best round-trip flight deal from Washington, D.C. to St. Louis found on momondo in the last 72 hours is $340.
The fastest flight from Washington, D.C. to St. Louis takes 2h 15m
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 15m 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
5.8
3,082 reviews
Search Frontier flights
DeltaPriceFrom $130Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $172Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
SouthwestPriceFrom $187Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights

  • Southwest Flights From Washington, D.C. to St. Louis

    Southwest operates around 12 flights from Washington, D.C. to St. Louis every week. The average price of these flights found in the last 72 hours has been $353, but momondo users have found Southwest deals from Washington, D.C. to St. Louis from as low as $187 round-trip. Southwest has been scored 7.9/10 in 4,250 reviews.

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

    United Airlines (7.4/10 from 9,092 reviews) operates around 6 flights from Washington, D.C. to St. Louis in any given week. The average United Airlines airfare for this route is around $396, with deals from around $223 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
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Clayton
Festus
Glencoe
Farmington
Eureka
Edwardsville
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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vie. 1/16
vie. 1/23
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