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Cheap flights from District of Columbia to St. Louis from $55

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from District of Columbia to St. Louis departing on 12/15. 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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0 bags

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Find the cheapest flights from District of Columbia to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:00 pm - 10:02 amDCA-STL
17h 02m1 stop
Frontier Logo
10:16 pm - 4:59 pmSTL-DCA
17h 43m2 stops
$240Frontier
Find Deal
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
8:00 am - 6:44 pmDCA-STL
11h 44m1 stop
Frontier Logo
9:32 pm - 5:00 pmSTL-DCA
18h 28m2 stops
$241Frontier
Find Deal
Fri, Jan 30 - Sun, Feb 1
Frontier Logo
8:00 am - 6:06 pmDCA-STL
11h 06m1 stop
Frontier Logo
4:45 pm - 12:04 pmSTL-DCA
42h 19m2 stops
$242Frontier
Find Deal
Mon, Jan 19 - Mon, Jan 26
Frontier Logo
9:20 pm - 8:59 amIAD-STL
12h 39m1 stop
Frontier Logo
4:27 pm - 9:03 pmSTL-IAD
27h 36m1 stop
$243Frontier
Find Deal
Sat, Dec 13 - Sat, Dec 20
American Airlines Logo
6:51 am - 1:43 pmDCA-STL
7h 52m1 stop
American Airlines Logo
6:00 pm - 9:15 pmSTL-DCA
2h 15mnonstop
$245American Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
American Airlines Logo
2:55 pm - 4:26 pmDCA-STL
2h 31mnonstop
American Airlines Logo
6:00 am - 9:19 amSTL-DCA
2h 19mnonstop
$250American Airlines
Find Deal
Wed, Dec 31 - Wed, Jan 7
Delta Logo
7:01 am - 10:45 amIAD-STL
4h 44m1 stop
Delta Logo
11:40 am - 5:03 pmSTL-IAD
4h 23m1 stop
$255Delta
Find Deal
Tue, Dec 2 - Wed, Dec 3
Delta Logo
10:20 am - 4:06 pmDCA-STL
6h 46m1 stop
Delta Logo
6:00 am - 11:37 amSTL-DCA
4h 37m1 stop
$255Delta
Find Deal
Tue, Dec 2 - Tue, Dec 9
Southwest Logo
8:00 am - 9:35 amDCA-STL
2h 35mnonstop
Southwest Logo
3:50 pm - 6:50 pmSTL-DCA
2h 00mnonstop
$265Southwest
Find Deal
Thu, Jan 22 - Sat, Jan 24
United Airlines Logo
8:40 am - 10:13 amIAD-STL
2h 33mnonstop
United Airlines Logo
8:05 am - 4:00 pmSTL-IAD
6h 55m1 stop
$275United Airlines
Find Deal
Thu, Jan 22 - Sat, Jan 24

Frontier flights from District of Columbia to St. Louis

Our best Frontier deals on District of Columbia to St. Louis flight tickets
Frontier
Jan 9
DCA6:00 pmWashington, D.C. Reagan-National
17h 02m
1 stop
STL10:02 amLambert-St Louis
Jan 11
STL10:16 pmLambert-St Louis
17h 43m
2 stops
DCA4:59 pmWashington, D.C. Reagan-National
$240
Find similar
Frontier
Jan 30
DCA8:00 amWashington, D.C. Reagan-National
11h 44m
1 stop
STL6:44 pmLambert-St Louis
Feb 1
STL9:32 pmLambert-St Louis
18h 28m
2 stops
DCA5:00 pmWashington, D.C. Reagan-National
$241
Find similar
Frontier
Jan 19
DCA8:00 amWashington, D.C. Reagan-National
11h 06m
1 stop
STL6:06 pmLambert-St Louis
Jan 26
STL4:45 pmLambert-St Louis
42h 19m
2 stops
DCA12:04 pmWashington, D.C. Reagan-National
$242
Find similar

American Airlines flights from District of Columbia to St. Louis

Our best American Airlines deals on District of Columbia to St. Louis flight tickets
American Airlines
Dec 2
DCA6:51 amWashington, D.C. Reagan-National
7h 52m
1 stop
STL1:43 pmLambert-St Louis
Dec 9
STL6:00 pmLambert-St Louis
2h 15m
DCA9:15 pmWashington, D.C. Reagan-National
$245
Find similar
American Airlines
Dec 31
DCA2:55 pmWashington, D.C. Reagan-National
2h 31m
STL4:26 pmLambert-St Louis
Jan 7
STL6:00 amLambert-St Louis
2h 19m
DCA9:19 amWashington, D.C. Reagan-National
$250
Find similar
American Airlines
Nov 27
DCA9:45 amWashington, D.C. Reagan-National
7h 40m
1 stop
STL4:25 pmLambert-St Louis
Dec 2
STL6:48 pmLambert-St Louis
2h 12m
DCA10:00 pmWashington, D.C. Reagan-National
$259
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 November 17, 2025.
Use the filters below to find and compare flights from District of Columbia to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 1/9

6:00 pm-10:02 am

1 stop17h 02m

Lambert-St Louis

Sun 1/11

10:16 pm-4:59 pm

2 stops17h 43m

$240

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 1/30

8:00 am-6:44 pm

1 stop11h 44m

Lambert-St Louis

Sun 2/1

9:32 pm-5:00 pm

2 stops18h 28m

$241

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 1/19

8:00 am-6:06 pm

1 stop11h 06m

Lambert-St Louis

Mon 1/26

4:45 pm-12:04 pm

2 stops42h 19m

$242

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 12/13

9:20 pm-8:59 am

1 stop12h 39m

Lambert-St Louis

Sat 12/20

4:27 pm-9:03 pm

1 stop27h 36m

$243

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/2

6:51 am-1:43 pm

1 stop7h 52m

Lambert-St Louis

Tue 12/9

6:00 pm-9:15 pm

Nonstop2h 15m

$245

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 12/31

2:55 pm-4:26 pm

Nonstop2h 31m

Lambert-St Louis

Wed 1/7

6:00 am-9:19 am

Nonstop2h 19m

$250

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 12/2

7:01 am-10:45 am

1 stop4h 44m

Lambert-St Louis

Wed 12/3

11:40 am-5:03 pm

1 stop4h 23m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/2

10:20 am-4:06 pm

1 stop6h 46m

Lambert-St Louis

Tue 12/9

6:00 am-11:37 am

1 stop4h 37m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/22

8:00 am-9:35 am

Nonstop2h 35m

Lambert-St Louis

Sat 1/24

3:50 pm-6:50 pm

Nonstop2h 00m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 1/22

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Sat 1/24

8:05 am-4:00 pm

1 stop6h 55m

$275

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 District of Columbia 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 District of Columbia 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 District of Columbia 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 Tuesday when prices can be found for as low as $336. 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 $425. 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 District of Columbia in the evening is the least expensive time of day to depart. momondo users have found prices as low as $315 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 District of Columbia to Lambert-St Louis flight route?

Fly from Washington, D.C. Reagan-National to Lambert-St Louis for the best District of Columbia - 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 District of Columbia when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $405 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from District of Columbia for as low as $191 on momondo.

What cabin class options are available on District of Columbia to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on District of Columbia 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 District of Columbia to St. Louis flights?

You could potentially save up to 32% on your flight if you consider stops on a District of Columbia to St. Louis flight.

Cheap District of Columbia to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from District of Columbia to St. Louis

Best Price Found

$148

Fastest flight time

2h 20m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from District of Columbia in the past 72 hours is $148. The best round-trip flight deal from District of Columbia to St. Louis found on momondo in the last 72 hours is $311.
The fastest flight from District of Columbia to St. Louis takes 2h 20m
Direct flights go from District of Columbia to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • When did momondo last update prices for flights from District of Columbia to Lambert-St Louis Airport?

    Prices for flights from District of Columbia to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from District of Columbia to Lambert-St Louis Airport?

  • How old do you have to be to fly from District of Columbia 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 District of Columbia 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 District of Columbia to St. Louis?

Best airlines flying from District of Columbia to St. Louis

Compare and see reviews for airlines that fly from District of Columbia to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $112Free CancellationRating
5.8
3,106 reviews
Search Frontier flights
DeltaPriceFrom $130Free CancellationRating
7.9
8,007 reviews
Search Delta flights
American AirlinesPriceFrom $172Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $188Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
9,013 reviews
Search United Airlines flights

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
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from District of Columbia to St. Louis?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from District of Columbia to St. Louis. momondo saves you time and could save you money on your trip.

Can I find flights from District of Columbia to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from District of Columbia on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from District of Columbia to St. Louis?

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 St. Louis from District of Columbia.

I’m not ready to book a flight from District of Columbia to St. Louis right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of District of Columbia to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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