What airlines fly to St. Louis?

Southwest, American Airlines and Frontier are the top three most popular airlines that fly to St. Louis from Washington, D.C. according to our data. Southwest is the first choice among our users, with 48% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

How many flights depart from Washington, D.C. to St. Louis on average per week?

As of May 2026, there are 121 flights per week flying from Washington, D.C. to St. Louis. The most common day of the week flights depart is Mon, with 18% of flights taking off on this day.

How long does it take to fly to St. Louis?

Flight times from Washington, D.C. to St. Louis vary, but if you’re flying out of Baltimore and flying into St. Louis (one of the most popular routes), then the duration is 2h 10m on average. Another popular route from Washington, D.C. to St. Louis is flying from Washington, D.C. to St. Louis, which will take roughly 2h 12m. Keep in mind that layovers or delays could extend your travel time.

What is the cheapest airline that flies from Washington, D.C. to Lambert-St Louis?

Southwest, United Airlines, and Delta are the most popular carriers operating from Washington, D.C. to Lambert-St Louis

How many flights depart from Washington, D.C. to St. Louis on average per day?

As of May 2026, 17 flights take off from Washington, D.C. and land in St. Louis each day. The most common flight departure time for this route is 5:00PM, with 45% of daily flights taking off in the afternoon.

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?

The number of operators available for flights from Washington, D.C. to Lambert-St Louis Airport is 5 as of May 2026.

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.

$58 Cheap Flights from Washington, D.C. to St. Louis in 2026

Q: What is the typical price of a round-trip flight between Washington, D.C. and St. Louis?

Prices are currently low for flights on this route. Typical prices usually range from $449 to $303. The lowest price recently found on this route was $123.

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Washington, D.C. to St. Louis

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:31 am - 5:30 pm

BWI

STL

9h 59m

1 stop

5:06 pm - 7:35 am

STL

BWI

13h 29m

1 stop

$123Frontier

Tue, Jun 16 - Wed, Jun 17

7:27 pm - 8:52 am

BWI

STL

14h 25m

1 stop

4:52 pm - 3:34 pm

STL

BWI

21h 42m

1 stop

$124Frontier

Fri, Jul 3 - Mon, Jul 6

9:43 pm - 8:52 am

BWI

STL

12h 09m

1 stop

6:31 pm - 7:35 am

STL

BWI

12h 04m

1 stop

$125Frontier

Thu, Jun 25 - Tue, Jun 30

8:52 am - 5:33 pm

BWI

STL

9h 41m

1 stop

5:27 pm - 7:43 am

STL

BWI

13h 16m

1 stop

$126Frontier

Thu, May 28 - Mon, Jun 1

8:31 am - 5:30 pm

BWI

STL

9h 59m

1 stop

5:06 pm - 7:35 am

STL

BWI

13h 29m

1 stop

$127Frontier

Tue, Jun 23 - Mon, Jun 29

9:43 pm - 8:55 am

BWI

STL

12h 12m

1 stop

6:31 pm - 7:35 am

STL

BWI

12h 04m

1 stop

$128Frontier

Thu, Jun 4 - Thu, Jun 11

11:45 am - 2:50 pm

DCA

STL

4h 05m

1 stop

7:55 pm - 10:55 pm

STL

DCA

2h 00mnonstop

$263Southwest

Tue, Jun 16 - Tue, Jun 16

8:00 am - 9:20 am

DCA

STL

2h 20mnonstop

3:25 pm - 6:25 pm

STL

DCA

2h 00mnonstop

$265Southwest

Sat, May 30 - Sat, May 30

8:47 pm - 8:55 am

IAD

STL

13h 08m

1 stop

4:17 pm - 2:12 pm

STL

IAD

20h 55m

2 stops

$265Multiple Airlines

Thu, Jun 4 - Thu, Jun 11

3:39 pm - 9:30 pm

IAD

STL

6h 51m

1 stop

12:55 pm - 4:07 pm

STL

IAD

2h 12mnonstop

$267United Airlines

Tue, Jun 2 - Tue, Jun 16

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

Our best Southwest deals on Washington, D.C. to St. Louis flight tickets

Southwest

Jun 16

DCA11:45 amWashington, D.C. Reagan-National

4h 05m

1 stop

STL2:50 pmLambert-St Louis

Jun 16

STL7:55 pmLambert-St Louis

2h 00m

DCA10:55 pmWashington, D.C. Reagan-National

$263

Southwest

May 28

DCA8:00 amWashington, D.C. Reagan-National

2h 20m

STL9:20 amLambert-St Louis

Jun 1

STL7:40 pmLambert-St Louis

2h 00m

DCA10:40 pmWashington, D.C. Reagan-National

$265

Southwest

Jun 2

DCA6:50 pmWashington, D.C. Reagan-National

4h 10m

1 stop

STL10:00 pmLambert-St Louis

Jun 16

STL1:10 pmLambert-St Louis

2h 00m

DCA4:10 pmWashington, D.C. Reagan-National

$267

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

Our best Frontier deals on Washington, D.C. to St. Louis flight tickets

Frontier

Jun 16

BWI8:31 amBaltimore/Washington

9h 59m

1 stop

STL5:30 pmLambert-St Louis

Jun 17

STL5:06 pmLambert-St Louis

13h 29m

1 stop

BWI7:35 amBaltimore/Washington

$123

Frontier

Jul 3

BWI7:27 pmBaltimore/Washington

14h 25m

1 stop

STL8:52 amLambert-St Louis

Jul 6

STL4:52 pmLambert-St Louis

21h 42m

1 stop

BWI3:34 pmBaltimore/Washington

$124

Frontier

Jun 25

BWI9:43 pmBaltimore/Washington

12h 09m

1 stop

STL8:52 amLambert-St Louis

Jun 30

STL6:31 pmLambert-St Louis

12h 04m

1 stop

BWI7:35 amBaltimore/Washington

$125

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 6/16

8:31 am-5:30 pm

1 stop9h 59m

Lambert-St Louis

Wed 6/17

5:06 pm-7:35 am

1 stop13h 29m

$123

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 7/3

7:27 pm-8:52 am

1 stop14h 25m

Lambert-St Louis

Mon 7/6

4:52 pm-3:34 pm

1 stop21h 42m

$124

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 6/25

9:43 pm-8:52 am

1 stop12h 09m

Lambert-St Louis

Tue 6/30

6:31 pm-7:35 am

1 stop12h 04m

$125

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 5/28

8:52 am-5:33 pm

1 stop9h 41m

Lambert-St Louis

Mon 6/1

5:27 pm-7:43 am

1 stop13h 16m

$126

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 6/23

8:31 am-5:30 pm

1 stop9h 59m

Lambert-St Louis

Mon 6/29

5:06 pm-7:35 am

1 stop13h 29m

$127

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 6/4

9:43 pm-8:55 am

1 stop12h 12m

Lambert-St Louis

Thu 6/11

6:31 pm-7:35 am

1 stop12h 04m

$128

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 6/16

11:45 am-2:50 pm

1 stop4h 05m

Lambert-St Louis

Tue 6/16

7:55 pm-10:55 pm

Nonstop2h 00m

$263

Quickest round-trip

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 5/30

8:00 am-9:20 am

Nonstop2h 20m

Lambert-St Louis

Sat 5/30

3:25 pm-6:25 pm

Nonstop2h 00m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 6/4

8:47 pm-8:55 am

1 stop13h 08m

Lambert-St Louis

Thu 6/11

4:17 pm-2:12 pm

2 stops20h 55m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 6/2

3:39 pm-9:30 pm

1 stop6h 51m

Lambert-St Louis

Tue 6/16

12:55 pm-4:07 pm

Nonstop2h 12m

$267

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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, October 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 $72. The month of December is another great option to travel to St. Louis, with average flight prices from Washington, D.C. averaging around $78.

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 $350. 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 $414. 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 $334 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 $396 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

Can stopping save me money on Washington, D.C. to St. Louis flights?

You could potentially save up to 36% on your flight if you consider stops on a Washington, D.C. to St. Louis flight.

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

As of May 2026, prices for Washington, D.C. to St. Louis flights are approximately 80% more expensive 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	$162
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 $162. The best round-trip flight deal from Washington, D.C. to St. Louis found on momondo in the last 72 hours is $315.

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 in St. Louis. From Washington, D.C. there are direct flights to Lambert-St Louis (STL).

Search flight deals

Frequently asked questions about flying from Washington, D.C. to St. Louis

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?
The number of operators available for flights from Washington, D.C. to Lambert-St Louis Airport is 5 as of May 2026.
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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. to St. Louis is Boeing 737 MAX 8 (21.22% of total bookings). The next most popular plane models are Canadair (Bombardier) Regional Jet 700 (15.79%), Canadair (Bombardier) Regional Jet 900 (15.46%), and Boeing 737-800 Passenger/BBJ2 (winglets) (11.77%).
What is the most popular airline from Washington, D.C. to St. Louis?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. to St. Louis is Southwest, representing 59% of all bookings. The subsequent popular airlines are American Airlines at 30%, United Airlines at 5%, and Frontier at 4%.

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
Frontier	PriceFrom $72	Free Cancellation	Rating 5.6 2,950 reviews	Search Frontier flights
Delta	PriceFrom $124	Free Cancellation	Rating 7.9 8,446 reviews	Search Delta flights
American Airlines	PriceFrom $178	Free Cancellation	Rating 7.1 11,661 reviews	Search American Airlines flights
Southwest	PriceFrom $203	Free Cancellation	Rating 8.0 4,295 reviews	Search Southwest flights
United Airlines	PriceFrom $257	Free Cancellation	Rating 7.4 9,701 reviews	Search United Airlines flights

Southwest Flights From Washington, D.C. to St. Louis
Southwest operates around 25 flights from Washington, D.C. to St. Louis every week. The average price of these flights found in the last 72 hours has been $388, but momondo users have found Southwest deals from Washington, D.C. to St. Louis from as low as $203 round-trip. Southwest has been scored 8.0/10 in 4,295 reviews.
United Airlines Flights From Washington, D.C. to St. Louis
United Airlines (7.4/10 from 9,701 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 $509, with deals from around $257 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. to St. Louis flight searches in the last 72 hours.

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

O'Fallon

Florissant

St. Peters

Collinsville

Alton

Wentzville

Fenton

Farmington

Festus

Clayton

Eureka

Litchfield

Edwardsville

Shrewsbury

Grafton

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.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Thu 6/11

Thu 6/18

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Nearby airports

Airlines

Cabin classes

Other United States destinations

Other flights from Washington, D.C.

Complete your trip

Feeling lucky

Airports servicing Missouri

Branson Airport

Cape Girardeau Airport

Columbia Regional Airport

Kirksville Cannon Memorial Airport

Joplin Airport

Kansas City Airport

Springfield-Branson Airport

Fort Leonard Wood Waynesville Regional Airport

Cheap flights from Washington, D.C. to St. Louis from $58

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 7/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Washington, D.C. to St. Louis

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

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

Our best Southwest deals on Washington, D.C. to St. Louis flight tickets

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

Our best Frontier deals on Washington, D.C. to St. Louis flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to St. Louis that are best for you.

See travel insights to St. Louis from

How to get the cheapest flight ticket from Washington, D.C. to St. Louis

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?

What is the cheapest day to depart on your flight to St. Louis?

What is the cheapest time of day to depart on your flight to St. Louis?

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

Can stopping save me money on Washington, D.C. to St. Louis flights?

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

What is the cheapest airline that flies from Washington, D.C. to Lambert-St Louis?

What airlines fly to St. Louis?

How many flights depart from Washington, D.C. to St. Louis on average per day?

How many flights depart from Washington, D.C. to St. Louis on average per week?

How long does it take to fly to St. Louis?

When to book flights from Washington, D.C. to St. Louis

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

Fastest flight time

Direct flights

Airports in St. Louis

Frequently asked questions about flying 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

Southwest Flights From Washington, D.C. to St. Louis

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

Traveling to a place near St. Louis?

Why use momondo?

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Missouri

Fly your favorite airline to St. Louis

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to St. Louis

List of cabin classes available on flights landing in St. Louis. Availability may vary depending on flight origin and airline.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Washington, D.C.

According to popular flight searches on momondo this year

Complete your trip to St. Louis

Explore popular destinations other users love

According to popular flight searches on momondo this year