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Cheap flights from Washington, D.C. Reagan-National Airport to St. Louis from $67

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 11/18. 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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:00 pm - 9:07 amDCA-STL
16h 07m1 stop
Frontier Logo
9:07 pm - 4:59 pmSTL-DCA
18h 52m2 stops
$239Frontier
Find Deal
Mon, Nov 3 - Fri, Nov 7
Frontier Logo
6:31 pm - 9:07 amDCA-STL
15h 36m1 stop
Frontier Logo
7:45 pm - 1:02 pmSTL-DCA
16h 17m1 stop
$241Frontier
Find Deal
Fri, Oct 31 - Sat, Nov 8
Frontier Logo
6:31 pm - 9:07 amDCA-STL
15h 36m1 stop
Frontier Logo
7:45 pm - 4:59 pmSTL-DCA
20h 14m1 stop
$245Frontier
Find Deal
Fri, Oct 31 - Mon, Nov 3
American Airlines Logo
7:50 am - 9:20 amDCA-STL
2h 30mnonstop
American Airlines Logo
6:02 am - 9:14 amSTL-DCA
2h 12mnonstop
$246American Airlines
Find Deal
Tue, Nov 18 - Mon, Nov 24
United Airlines Logo
5:00 pm - 9:13 pmDCA-STL
5h 13m1 stop
United Airlines Logo
9:57 am - 4:59 pmSTL-DCA
6h 02m1 stop
$249United Airlines
Find Deal
Sat, Jan 17 - Sun, Jan 18
Southwest Logo
6:40 pm - 12:15 amDCA-STL
6h 35m1 stop
Southwest Logo
3:55 pm - 6:50 pmSTL-DCA
1h 55mnonstop
$256Southwest
Find Deal
Sat, Nov 22 - Mon, Nov 24
Southwest Logo
8:00 am - 9:20 amDCA-STL
2h 20mnonstop
Southwest Logo
7:00 pm - 9:55 pmSTL-DCA
1h 55mnonstop
$263Southwest
Find Deal
Sat, Nov 15 - Wed, Nov 19
Delta Logo
6:59 am - 10:43 amDCA-STL
4h 44m1 stop
Delta Logo
5:17 pm - 11:41 pmSTL-DCA
5h 24m1 stop
$266Delta
Find Deal
Tue, Nov 18 - Mon, Nov 24
American Airlines Logo
2:55 pm - 4:36 pmDCA-STL
2h 41mnonstop
American Airlines Logo
6:14 pm - 9:26 pmSTL-DCA
2h 12mnonstop
$269American Airlines
Find Deal
Mon, Nov 10 - Fri, Nov 14
Delta Logo
6:59 am - 10:43 amDCA-STL
4h 44m1 stop
Delta Logo
10:45 am - 4:35 pmSTL-DCA
4h 50m1 stop
$283Delta
Find Deal
Tue, Nov 11 - Sat, Nov 15

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

Our best Frontier deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
Frontier
Nov 3
DCA6:00 pmWashington, D.C. Reagan-National
16h 07m
1 stop
STL9:07 amLambert-St Louis
Nov 7
STL9:07 pmLambert-St Louis
18h 52m
2 stops
DCA4:59 pmWashington, D.C. Reagan-National
$239
Find similar
Frontier
Oct 31
DCA6:31 pmWashington, D.C. Reagan-National
15h 36m
1 stop
STL9:07 amLambert-St Louis
Nov 8
STL7:45 pmLambert-St Louis
16h 17m
1 stop
DCA1:02 pmWashington, D.C. Reagan-National
$241
Find similar
Frontier
Oct 31
DCA6:31 pmWashington, D.C. Reagan-National
15h 36m
1 stop
STL9:07 amLambert-St Louis
Nov 3
STL7:45 pmLambert-St Louis
20h 14m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
$245
Find similar

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
Nov 18
DCA7:50 amWashington, D.C. Reagan-National
2h 30m
STL9:20 amLambert-St Louis
Nov 24
STL6:02 amLambert-St Louis
2h 12m
DCA9:14 amWashington, D.C. Reagan-National
$246
Find similar
American Airlines
Nov 10
DCA2:55 pmWashington, D.C. Reagan-National
2h 41m
STL4:36 pmLambert-St Louis
Nov 14
STL6:14 pmLambert-St Louis
2h 12m
DCA9:26 pmWashington, D.C. Reagan-National
$269
Find similar
American Airlines
Dec 23
DCA7:50 pmWashington, D.C. Reagan-National
5h 02m
1 stop
STL11:52 pmLambert-St Louis
Dec 31
STL6:02 amLambert-St Louis
2h 08m
DCA9:10 amWashington, D.C. Reagan-National
$274
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 October 20, 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 11/3

6:00 pm-9:07 am

1 stop16h 07m

Lambert-St Louis

Fri 11/7

9:07 pm-4:59 pm

2 stops18h 52m

$239

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 10/31

6:31 pm-9:07 am

1 stop15h 36m

Lambert-St Louis

Sat 11/8

7:45 pm-1:02 pm

1 stop16h 17m

$241

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 10/31

6:31 pm-9:07 am

1 stop15h 36m

Lambert-St Louis

Mon 11/3

7:45 pm-4:59 pm

1 stop20h 14m

$245

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 11/18

7:50 am-9:20 am

Nonstop2h 30m

Lambert-St Louis

Mon 11/24

6:02 am-9:14 am

Nonstop2h 12m

$246

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 1/17

5:00 pm-9:13 pm

1 stop5h 13m

Lambert-St Louis

Sun 1/18

9:57 am-4:59 pm

1 stop6h 02m

$249

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 11/22

6:40 pm-12:15 am

1 stop6h 35m

Lambert-St Louis

Mon 11/24

3:55 pm-6:50 pm

Nonstop1h 55m

$256

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 11/15

8:00 am-9:20 am

Nonstop2h 20m

Lambert-St Louis

Wed 11/19

7:00 pm-9:55 pm

Nonstop1h 55m

$263

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 11/18

6:59 am-10:43 am

1 stop4h 44m

Lambert-St Louis

Mon 11/24

5:17 pm-11:41 pm

1 stop5h 24m

$266

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 11/10

2:55 pm-4:36 pm

Nonstop2h 41m

Lambert-St Louis

Fri 11/14

6:14 pm-9:26 pm

Nonstop2h 12m

$269

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 11/11

6:59 am-10:43 am

1 stop4h 44m

Lambert-St Louis

Sat 11/15

10:45 am-4:35 pm

1 stop4h 50m

$283

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, August 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 $267. The month of February is another great option to travel to St. Louis, with average flight prices from Washington, D.C. Reagan-National Airport averaging around $270.

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 $343. 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 $426. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $311 when looking at flights departing at noon. 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. 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 $317 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 $226 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 October 2025, prices for Washington, D.C. Reagan-National Airport to St. Louis flights are approximately 47% more expensive 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

$149

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. Reagan-National Airport in the past 72 hours is $149. 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 $299.
The fastest flight from Washington, D.C. Reagan-National Airport to St. Louis takes 2h 15m
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 20m.

  • 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
11,026 reviews
Search American Airlines flights
SouthwestPriceFrom $188Free CancellationRating
8.0
4,241 reviews
Search Southwest flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
8,994 reviews
Search United Airlines flights
DeltaPriceFrom $223Free CancellationRating
7.9
7,976 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 22 times per week, with 4,241 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 $188 (round-trip), much lower than the average airfare cost of $313 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 11,026 reviews) operates around 23 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 $330, 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
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Wentzville
Collinsville
Fenton
St. Peters
Alton
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
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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