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Cheap flights from Washington, D.C. Reagan-National Airport to St. Louis from $87

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. Reagan-National Airport to St. Louis departing on 11/7. 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. Reagan-National Airport to St. Louis (DCA-STL)

Cheap round-trip flights

Frontier Logo
1:00 pm - 9:06 amDCA-STL
21h 06m1 stop
Frontier Logo
7:55 pm - 12:10 pmSTL-DCA
15h 15m1 stop
$167Frontier
Find Deal
Mon, Sep 8 - Tue, Sep 9
Southwest Logo
3:20 pm - 4:40 pmDCA-STL
2h 20mnonstop
Southwest Logo
6:30 pm - 9:35 pmSTL-DCA
2h 05mnonstop
$173Southwest
Find Deal
Thu, Sep 25 - Sat, Sep 27
United Airlines Logo
7:25 am - 10:49 amDCA-STL
4h 24m1 stop
United Airlines Logo
3:23 pm - 9:03 pmSTL-DCA
4h 40m1 stop
$193United Airlines
Find Deal
Thu, Sep 25 - Sat, Sep 27
Southwest Logo
12:00 pm - 1:20 pmDCA-STL
2h 20mnonstop
Southwest Logo
8:30 am - 11:25 amSTL-DCA
1h 55mnonstop
$195Southwest
Find Deal
Mon, Oct 6 - Sun, Nov 2
Frontier Logo
6:00 pm - 9:06 amDCA-STL
16h 06m1 stop
Frontier Logo
7:55 pm - 4:59 pmSTL-DCA
20h 04m1 stop
$196Frontier
Find Deal
Sat, Sep 6 - Mon, Sep 8
Delta Logo
6:00 am - 9:33 amDCA-STL
4h 33m1 stop
Delta Logo
3:40 pm - 10:42 pmSTL-DCA
6h 02m1 stop
$197Delta
Find Deal
Sun, Sep 14 - Thu, Sep 18
United Airlines Logo
2:00 pm - 6:23 pmDCA-STL
5h 23m1 stop
United Airlines Logo
6:30 am - 12:59 pmSTL-DCA
5h 29m1 stop
$207United Airlines
Find Deal
Mon, Sep 22 - Thu, Sep 25
American Airlines Logo
8:30 am - 10:21 amDCA-STL
2h 51mnonstop
American Airlines Logo
10:34 am - 1:35 pmSTL-DCA
2h 01mnonstop
$212American Airlines
Find Deal
Thu, Sep 25 - Sun, Sep 28
American Airlines Logo
7:51 pm - 9:02 pmDCA-STL
2h 11mnonstop
American Airlines Logo
5:52 pm - 8:53 pmSTL-DCA
2h 01mnonstop
$213American Airlines
Find Deal
Sun, Aug 31 - Tue, Sep 2
Delta Logo
6:00 am - 9:32 amDCA-STL
4h 32m1 stop
Delta Logo
1:26 pm - 9:48 pmSTL-DCA
7h 22m1 stop
$235Delta
Find Deal
Sun, Aug 31 - Tue, Sep 2

American Airlines flights from Washington, D.C. Reagan-National Airport to St. Louis

Our best American Airlines deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
American Airlines
Sep 25
DCA8:30 amWashington, D.C. Reagan-National
2h 51m
STL10:21 amLambert-St Louis
Sep 28
STL10:34 amLambert-St Louis
2h 01m
DCA1:35 pmWashington, D.C. Reagan-National
$212
Find similar
American Airlines
Aug 31
DCA7:51 pmWashington, D.C. Reagan-National
2h 11m
STL9:02 pmLambert-St Louis
Sep 2
STL5:52 pmLambert-St Louis
2h 01m
DCA8:53 pmWashington, D.C. Reagan-National
$213
Find similar
American Airlines
Sep 25
DCA2:56 pmWashington, D.C. Reagan-National
2h 19m
STL4:15 pmLambert-St Louis
Sep 28
STL6:05 amLambert-St Louis
3h 55m
1 stop
DCA11:00 amWashington, D.C. Reagan-National
$222
Find similar

Delta flights from Washington, D.C. Reagan-National Airport to St. Louis

Our best Delta deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
Delta
Sep 14
DCA6:00 amWashington, D.C. Reagan-National
4h 33m
1 stop
STL9:33 amLambert-St Louis
Sep 18
STL3:40 pmLambert-St Louis
6h 02m
1 stop
DCA10:42 pmWashington, D.C. Reagan-National
$197
Find similar
Delta
Aug 31
DCA6:00 amWashington, D.C. Reagan-National
4h 32m
1 stop
STL9:32 amLambert-St Louis
Sep 2
STL1:26 pmLambert-St Louis
7h 22m
1 stop
DCA9:48 pmWashington, D.C. Reagan-National
$235
Find similar
Delta
Sep 18
DCA6:00 amWashington, D.C. Reagan-National
4h 59m
1 stop
STL9:59 amLambert-St Louis
Sep 21
STL6:42 pmLambert-St Louis
4h 00m
1 stop
DCA11:42 pmWashington, D.C. Reagan-National
$258
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Reagan-National Airport 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 August 14, 2025.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport 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

Mon 9/8

1:00 pm-9:06 am

1 stop21h 06m

Lambert-St Louis

Tue 9/9

7:55 pm-12:10 pm

1 stop15h 15m

$167

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 9/25

3:20 pm-4:40 pm

Nonstop2h 20m

Lambert-St Louis

Sat 9/27

6:30 pm-9:35 pm

Nonstop2h 05m

$173

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 9/25

7:25 am-10:49 am

1 stop4h 24m

Lambert-St Louis

Sat 9/27

3:23 pm-9:03 pm

1 stop4h 40m

$193

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 10/6

12:00 pm-1:20 pm

Nonstop2h 20m

Lambert-St Louis

Sun 11/2

8:30 am-11:25 am

Nonstop1h 55m

$195

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 9/6

6:00 pm-9:06 am

1 stop16h 06m

Lambert-St Louis

Mon 9/8

7:55 pm-4:59 pm

1 stop20h 04m

$196

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 9/14

6:00 am-9:33 am

1 stop4h 33m

Lambert-St Louis

Thu 9/18

3:40 pm-10:42 pm

1 stop6h 02m

$197

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 9/22

2:00 pm-6:23 pm

1 stop5h 23m

Lambert-St Louis

Thu 9/25

6:30 am-12:59 pm

1 stop5h 29m

$207

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 9/25

8:30 am-10:21 am

Nonstop2h 51m

Lambert-St Louis

Sun 9/28

10:34 am-1:35 pm

Nonstop2h 01m

$212

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 8/31

7:51 pm-9:02 pm

Nonstop2h 11m

Lambert-St Louis

Tue 9/2

5:52 pm-8:53 pm

Nonstop2h 01m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 8/31

6:00 am-9:32 am

1 stop4h 32m

Lambert-St Louis

Tue 9/2

1:26 pm-9:48 pm

1 stop7h 22m

$235

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. Reagan-National Airport 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, February is the cheapest month to fly from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport 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 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 $404. 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. Reagan-National Airport 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 $386 per ticket.

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

Fly from Washington, D.C. Reagan-National to Lambert-St Louis for the best Washington, D.C. Reagan-National - 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. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $325 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. Reagan-National Airport for as low as $227 on momondo.

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

There are 3 cabin classes available to choose from on Washington, D.C. Reagan-National 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.

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

As of August 2025, prices for Washington, D.C. Reagan-National Airport to St. Louis flights are approximately 29% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. Reagan-National Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to St. Louis (DCA to STL) flight deals and tips

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

Best Price Found

$87

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. Reagan-National Airport in the past 72 hours is $87. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to St. Louis found on momondo in the last 72 hours is $167.
The fastest flight from Washington, D.C. Reagan-National Airport to St. Louis takes 2h 10m
Direct flights go from Washington, D.C. Reagan-National Airport to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • How far is Washington, D.C. Reagan-National to Lambert-St Louis by plane?

    Washington, D.C. Reagan-National and Lambert-St Louis are 708.3 mi apart from one another. In terms of flight time, this usually takes a little over 2h 10m.

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

    Prices for flights from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Washington, D.C. Reagan-National Airport to St. Louis?

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

Best airlines flying from Washington, D.C. Reagan-National Airport to St. Louis

Compare and see reviews for airlines that fly from Washington, D.C. Reagan-National Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $176Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $189Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
DeltaPriceFrom $223Free CancellationRating
8.0
7,980 reviews
Search Delta flights

  • Southwest Flights From Washington, D.C. Reagan-National Airport to St. Louis

    Southwest flies from Washington, D.C. Reagan-National Airport to St. Louis around 24 times per week, with 4,244 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Washington, D.C. Reagan-National Airport to St. Louis in the last 72 hours was $189 (round-trip), much lower than the average airfare cost of $314 for Southwest flights on this route.

  • American Airlines Flights From Washington, D.C. Reagan-National Airport to St. Louis

    American Airlines (7.2/10 from 10,000 reviews) operates around 17 flights from Washington, D.C. Reagan-National Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $332, with deals from around $176 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. Reagan-National Airport 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
Wentzville
Collinsville
Alton
St. Peters
Farmington
Festus
Glencoe
Eureka
Clayton
Edwardsville
Litchfield
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to St. Louis from Washington, D.C. with this policy.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington, D.C. to St. Louis.

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

Price alerts on flights to St. Louis from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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