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Cheap flights from Washington, D.C. Reagan-National Airport to St. Louis from $90

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 5/24. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Washington, D.C. Reagan-National Airport to St. Louis.
Southwest Logo
3:00 pm - 4:15 pmDCA-STL
2h 15mnonstop
Southwest Logo
1:50 pm - 4:55 pmSTL-DCA
2h 05mnonstop
$179Southwest
Find Deal
Thu, May 29 - Sat, May 31
Southwest Logo
3:00 pm - 4:15 pmDCA-STL
2h 15mnonstop
Southwest Logo
5:25 am - 12:30 pmSTL-DCA
6h 05m1 stop
$189Southwest
Find Deal
Thu, May 29 - Sat, May 31
Delta Logo
6:00 am - 9:35 amDCA-STL
4h 35m1 stop
Delta Logo
3:40 pm - 11:43 pmSTL-DCA
7h 03m1 stop
$199Delta
Find Deal
Sun, May 25 - Fri, May 30
Frontier Logo
1:00 pm - 10:01 amDCA-STL
22h 01m1 stop
Frontier Logo
6:58 pm - 12:09 pmSTL-DCA
16h 11m1 stop
$200Frontier
Find Deal
Fri, Apr 25 - Mon, Apr 28
Frontier Logo
7:00 am - 9:06 amDCA-STL
27h 06m1 stop
Frontier Logo
6:58 pm - 4:59 pmSTL-DCA
21h 01m1 stop
$210Frontier
Find Deal
Sun, Apr 20 - Fri, Apr 25
Delta Logo
6:00 am - 9:28 amDCA-STL
4h 28m1 stop
Delta Logo
12:47 pm - 6:30 pmSTL-DCA
4h 43m1 stop
$224Delta
Find Deal
Sun, Apr 20 - Sat, Apr 26
American Airlines Logo
8:15 am - 9:42 amDCA-STL
2h 27mnonstop
American Airlines Logo
6:12 am - 9:15 amSTL-DCA
2h 03mnonstop
$228American Airlines
Find Deal
Fri, May 30 - Sun, Jun 1
American Airlines Logo
8:22 am - 9:52 amDCA-STL
2h 30mnonstop
American Airlines Logo
6:13 am - 9:14 amSTL-DCA
2h 01mnonstop
$229American Airlines
Find Deal
Thu, May 1 - Sat, May 3
United Airlines Logo
6:20 am - 11:03 amDCA-STL
5h 43m1 stop
United Airlines Logo
6:30 am - 11:57 amSTL-DCA
4h 27m1 stop
$307United Airlines
Find Deal
Fri, Apr 25 - Sun, Apr 27
United Airlines Logo
12:00 pm - 3:47 pmDCA-STL
4h 47m1 stop
United Airlines Logo
8:00 am - 2:11 pmSTL-DCA
5h 11m1 stop
$422United Airlines
Find Deal
Tue, Apr 22 - Thu, Apr 24

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

Our best Southwest deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
Southwest
May 29
DCA3:00 pmWashington, D.C. Reagan-National
2h 15m
STL4:15 pmLambert-St Louis
May 31
STL1:50 pmLambert-St Louis
2h 05m
DCA4:55 pmWashington, D.C. Reagan-National
Southwest
May 29
DCA3:00 pmWashington, D.C. Reagan-National
2h 15m
STL4:15 pmLambert-St Louis
May 31
STL5:25 amLambert-St Louis
6h 05m
1 stop
DCA12:30 pmWashington, D.C. Reagan-National
Southwest
May 22
DCA8:00 amWashington, D.C. Reagan-National
2h 10m
STL9:10 amLambert-St Louis
May 25
STL8:00 pmLambert-St Louis
2h 00m
DCA11:00 pmWashington, D.C. Reagan-National

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
May 25
DCA6:00 amWashington, D.C. Reagan-National
4h 35m
1 stop
STL9:35 amLambert-St Louis
May 30
STL3:40 pmLambert-St Louis
7h 03m
1 stop
DCA11:43 pmWashington, D.C. Reagan-National
Delta
Apr 20
DCA6:00 amWashington, D.C. Reagan-National
4h 28m
1 stop
STL9:28 amLambert-St Louis
Apr 26
STL12:47 pmLambert-St Louis
4h 43m
1 stop
DCA6:30 pmWashington, D.C. Reagan-National
Delta
Apr 24
DCA6:00 amWashington, D.C. Reagan-National
4h 28m
1 stop
STL9:28 amLambert-St Louis
Apr 25
STL1:46 pmLambert-St Louis
4h 13m
1 stop
DCA6:59 pmWashington, D.C. Reagan-National

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 July is another great option to travel to St. Louis, with average flight prices from Washington, D.C. Reagan-National Airport averaging around $286.

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 $354. 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 $399. 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 $313 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $393 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 18 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $327 when searching 18 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 $243 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 April 2025, prices for Washington, D.C. Reagan-National Airport to St. Louis flights are approximately 43% 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

$90

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 $90. 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 $179.
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)

  • 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 $188Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $201Free CancellationRating
8.0
4,274 reviews
Search Southwest flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
8,619 reviews
Search United Airlines flights
DeltaPriceFrom $232Free CancellationRating
8.0
7,897 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 18 times per week, with 4,275 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 $201 (round-trip), much lower than the average airfare cost of $334 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 20 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 $324, with deals from around $188 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
Florissant
Fairview Heights
Maryland Heights
Hermann
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Wentzville
Alton
Glencoe
Eureka
Festus
Edwardsville
Clayton
Grafton
Litchfield

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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