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Cheap flights from Washington, D.C. to St. Louis from $52

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 12/2. 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

American Airlines Logo
2:56 pm - 4:14 pmDCA-STL
2h 18mnonstop
American Airlines Logo
6:02 am - 9:03 amSTL-DCA
2h 01mnonstop
$105American Airlines
Find Deal
sáb., ago. 16 - sáb., ago. 23
American Airlines Logo
7:51 pm - 9:02 pmDCA-STL
2h 11mnonstop
American Airlines Logo
5:52 pm - 8:53 pmSTL-DCA
2h 01mnonstop
$106American Airlines
Find Deal
jue., ago. 14 - lun., ago. 18
Southwest Logo
2:30 pm - 7:45 pmDCA-STL
6h 15m1 stop
Southwest Logo
7:25 pm - 10:30 pmSTL-DCA
2h 05mnonstop
$115Southwest
Find Deal
sáb., sep. 27 - lun., sep. 29
Southwest Logo
6:40 pm - 7:50 pmDCA-STL
2h 10mnonstop
Southwest Logo
3:40 pm - 6:40 pmSTL-DCA
2h 00mnonstop
$118Southwest
Find Deal
sáb., sep. 27 - lun., sep. 29
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
$149United Airlines
Find Deal
sáb., sep. 6 - lun., sep. 8
Frontier Logo
7:20 am - 1:34 pmBWI-STL
7h 14m1 stop
Frontier Logo
2:36 pm - 12:25 amSTL-BWI
8h 49m1 stop
$161Frontier
Find Deal
jue., jul. 24 - dom., jul. 27
United Airlines Logo
5:38 pm - 7:00 pmIAD-STL
2h 22mnonstop
United Airlines Logo
5:30 pm - 12:30 amSTL-IAD
6h 00m1 stop
$183United Airlines
Find Deal
sáb., ago. 16 - lun., ago. 18
Frontier Logo
1:37 pm - 11:47 pmIAD-STL
11h 10m1 stop
Frontier Logo
3:02 pm - 11:00 pmSTL-IAD
6h 58m1 stop
$186Frontier
Find Deal
sáb., ago. 16 - sáb., ago. 23
Delta Logo
3:26 pm - 7:07 pmIAD-STL
4h 41m1 stop
Delta Logo
5:11 pm - 12:21 amSTL-IAD
6h 10m1 stop
$197Delta
Find Deal
sáb., ago. 16 - lun., ago. 18
Delta Logo
6:00 am - 9:41 amDCA-STL
4h 41m1 stop
Delta Logo
5:23 pm - 10:42 pmSTL-DCA
4h 19m1 stop
$197Delta
Find Deal
jue., ago. 7 - sáb., ago. 9

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

Our best Frontier deals on Washington, D.C. to St. Louis flight tickets
Frontier
Jul 24
BWI7:20 amBaltimore/Washington
7h 14m
1 stop
STL1:34 pmLambert-St Louis
Jul 27
STL2:36 pmLambert-St Louis
8h 49m
1 stop
BWI12:25 amBaltimore/Washington
Frontier
Aug 16
IAD1:37 pmWashington, D.C. Dulles Intl
11h 10m
1 stop
STL11:47 pmLambert-St Louis
Aug 23
STL3:02 pmLambert-St Louis
6h 58m
1 stop
IAD11:00 pmWashington, D.C. Dulles Intl
Frontier
Aug 2
BWI2:59 pmBaltimore/Washington
9h 48m
1 stop
STL11:47 pmLambert-St Louis
Aug 7
STL2:36 pmLambert-St Louis
8h 49m
1 stop
BWI12:25 amBaltimore/Washington

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

Our best Spirit Airlines deals on Washington, D.C. to St. Louis flight tickets
Spirit Airlines
Aug 16
BWI2:30 pmBaltimore/Washington
24h 02m
1 stop
STL1:32 pmLambert-St Louis
Aug 18
STL2:30 pmLambert-St Louis
6h 39m
1 stop
BWI10:09 pmBaltimore/Washington
Spirit Airlines
Aug 14
BWI2:30 pmBaltimore/Washington
24h 02m
1 stop
STL1:32 pmLambert-St Louis
Aug 18
STL2:30 pmLambert-St Louis
6h 39m
1 stop
BWI10:09 pmBaltimore/Washington
Spirit Airlines
Aug 14
BWI2:30 pmBaltimore/Washington
24h 02m
1 stop
STL1:32 pmLambert-St Louis
Aug 18
STL2:30 pmLambert-St Louis
6h 39m
1 stop
BWI10:09 pmBaltimore/Washington

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 $279. 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 $349. 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 $412. 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 $314 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 $384 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 $410 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 $303 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 July 2025, prices for Washington, D.C. to St. Louis flights are approximately 25% 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

$52

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 $52. The best round-trip flight deal from Washington, D.C. to St. Louis found on momondo in the last 72 hours is $105.
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
5.9
3,273 reviews
Search Frontier flights
American AirlinesPriceFrom $158Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $169Free CancellationRating
8.0
7,958 reviews
Search Delta flights
SouthwestPriceFrom $198Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
United AirlinesPriceFrom $259Free CancellationRating
7.4
8,844 reviews
Search United Airlines flights
  • Southwest Flights From Washington, D.C. to St. Louis

    Southwest operates around 27 flights from Washington, D.C. to St. Louis every week. The average price of these flights found in the last 72 hours has been $347, but momondo users have found Southwest deals from Washington, D.C. to St. Louis from as low as $198 round-trip. Southwest has been scored 8.0/10 in 4,258 reviews.

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

    United Airlines (7.4/10 from 8,844 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 $476, with deals from around $259 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
Florissant
Maryland Heights
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Alton
Wentzville
Glencoe
Festus
Clayton
Eureka
Edwardsville
Grafton
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.


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1 adult
dom. 7/13
dom. 7/20

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