How long is the flight from Washington, D.C. to St. Louis?

A quick flight from Washington, D.C. to St. Louis can take about 4h 20m. Southwest provides one of the quickest options available for as low as $241. There are 717 mi between Washington, D.C. and St. Louis. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?

Our cheapest airline available from Washington, D.C. to St. Louis is Frontier. Our recent data shows that you can find tickets from as low as $78 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $124 and $204 round-trip. These flights start at 78% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $60. United Airlines flights start at $100 while deals on American Airlines start at $118 one-way.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the most popular routes from Washington, D.C. to St. Louis?

When deciding which route to take from Washington, D.C. to St. Louis consider Washington, D.C. Dulles Intl - Lambert-St Louis, Baltimore/Washington - Lambert-St Louis or Washington, D.C. Reagan-National - Lambert-St Louis as they are the most popular.

What are the cheapest flights from Washington, D.C. to St. Louis?

The cheapest flight price from Washington, D.C. to St. Louis is $207. On average you can expect to pay $730. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $163.

What are the most reliable airlines from Washington, D.C. to St. Louis?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. to St. Louis on time: Avianca (73%), Copa Airlines (73%), Brussels Airlines (63%).

What are the most popular airlines that fly from Washington, D.C. to St. Louis?

When booking a flight from Washington, D.C. to St. Louis, you may want to consider flying on Southwest, United Airlines or American Airlines as they are the most popular for this route.

Most accurate provider : When it comes to deals on Washington, D.C.-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C.-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to St. Louis from Washington, D.C.?

Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to St. Louis. 5 airlines have flights to Lambert-St Louis from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Lambert-St Louis should not be difficult; the airport handles an average of 13 inbound flights from Washington, D.C. per day.

Can I find deals for flights from Washington, D.C. to St. Louis that include hotel bookings?

Yes. In addition to deals on Washington, D.C. to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Washington, D.C. to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to St. Louis.

Can I find deals for business class flights from Washington, D.C. to St. Louis?

Yes. Cheapflights offers flight deals from Washington, D.C. to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in October or November, booked 48 days in advance, depart on a Wednesday or Thursday and return on a Friday

Cheap flight deals from Washington, D.C. to St. Louis

Cheapest

Best

Last-minute

One-way

Cheapest flights from Washington, D.C. to St. Louis
Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.

Wed 10/1410:22 am -

1 stop8h 18m

Wed 10/216:35 pm -

1 stop4h 59m

Deal found 9/12

$115

Wed 11/410:45 am -

1 stop7h 55m

Wed 11/116:44 pm -

1 stop4h 49m

Deal found 9/13

$118

Thu 10/159:12 pm -

1 stop21h 28m

Mon 10/196:35 pm -

1 stop21h 12m

Deal found 9/13

$128

Mon 11/210:16 am -

1 stop8h 24m

Mon 11/96:44 pm -

1 stop4h 49m

Deal found 9/16

$129

Wed 10/2110:22 am -

1 stop8h 18m

Mon 10/266:35 pm -

1 stop14h 15m

Deal found 9/13

$132

Wed 10/1410:22 am -

1 stop8h 18m

Mon 10/196:35 pm -

1 stop13h 52m

Deal found 9/16

$141

Wed 10/285:40 am -

1 stop13h 00m

Fri 10/306:44 pm -

1 stop4h 49m

Deal found 9/12

$142

Fri 11/136:24 am -

1 stop12h 16m

Wed 12/212:02 pm -

1 stop4h 53m

Deal found 9/16

$147

Mon 10/127:50 am -

1 stop10h 50m

Mon 10/196:35 pm -

1 stop4h 46m

Deal found 9/14

$237

Sat 10/176:40 pm -

Nonstop2h 30m

Tue 10/2010:20 am -

1 stop3h 10m

Deal found 9/14

$237

Sat 10/175:55 pm -

Nonstop2h 26m

Tue 10/207:01 pm -

1 stop4h 57m

Deal found 9/16

$241

Wed 10/218:00 am -

Nonstop2h 25m

Sat 10/246:05 am -

1 stop6h 55m

Deal found 9/14

$241

Best flights from Washington, D.C. to St. Louis
Discover carefully curated flight deals from Washington, D.C. to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.

Tue 10/67:30 am -

1 stop4h 20m

Tue 10/67:55 pm -

Nonstop2h 00m

Deal found 9/15

$241

Tue 11/108:23 am -

1 stop4h 47m

Sat 11/141:00 pm -

Nonstop2h 09m

Deal found 9/13

$265

Thu 10/86:05 am -

1 stop4h 44m

Mon 10/127:20 pm -

1 stop4h 22m

Deal found 9/15

$321

Wed 10/141:00 pm -

1 stop5h 40m

Wed 10/2110:20 am -

1 stop3h 10m

Deal found 9/16

$246

Wed 10/216:05 pm -

Nonstop2h 15m

Mon 10/267:50 pm -

1 stop4h 00m

Deal found 9/13

$256

Sat 10/318:20 am -

Nonstop2h 25m

Mon 11/210:30 am -

1 stop3h 45m

Deal found 9/16

$257

Sat 10/318:40 am -

Nonstop2h 32m

Mon 11/210:53 am -

1 stop5h 31m

Deal found 9/16

$333

Thu 10/296:05 am -

1 stop4h 44m

Sun 11/16:47 am -

1 stop3h 47m

Deal found 9/15

$341

Mon 11/212:00 pm -

Nonstop2h 25m

Wed 11/41:40 pm -

2 stops7h 15m

Deal found 9/12

$270

Wed 10/148:20 am -

Nonstop2h 21m

Sat 10/175:36 pm -

1 stop4h 16m

Deal found 9/16

$352

Tue 12/16:15 am -

Nonstop2h 25m

Tue 12/110:15 am -

1 stop5h 50m

Deal found 9/16

$273

Wed 10/146:45 am -

1 stop5h 37m

Wed 10/218:30 am -

Nonstop2h 16m

Deal found 9/12

$375

Tue 10/1311:40 am -

1 stop4h 20m

Tue 10/203:20 pm -

Nonstop1h 55m

Deal found 9/15

$283

Thu 10/13:15 pm -

1 stop5h 43m

Mon 10/55:59 pm -

1 stop4h 10m

Deal found 9/14

$436

Sat 10/176:15 am -

2 stops7h 20m

Tue 10/2010:20 am -

1 stop3h 10m

Deal found 9/14

$283

Thu 11/1212:00 pm -

2 stops8h 10m

Mon 11/161:40 pm -

2 stops7h 15m

Deal found 9/16

$295

Sat 10/310:30 am -

1 stop4h 46m

Mon 10/511:35 am -

1 stop5h 58m

Deal found 9/14

$457

Tue 10/66:30 am -

Nonstop2h 10m

Tue 10/611:25 am -

Nonstop2h 00m

Deal found 9/15

$298

Thu 10/15:20 pm -

1 stop6h 39m

Mon 10/58:30 am -

Nonstop2h 16m

Deal found 9/14

$467

Mon 11/26:40 am -

Nonstop2h 30m

Wed 11/46:15 pm -

Nonstop2h 05m

Deal found 9/16

$301

Sat 10/105:55 pm -

Nonstop2h 26m

Sun 10/118:30 am -

Nonstop2h 16m

Deal found 9/12

$467

Sat 12/52:30 pm -

2 stops6h 35m

Tue 12/810:55 am -

2 stops5h 30m

Deal found 9/16

$310

Wed 10/147:30 am -

1 stop3h 50m

Wed 10/216:30 pm -

Nonstop2h 05m

Deal found 9/12

$317

Sat 9/2610:30 am -

1 stop4h 46m

Sat 9/265:36 pm -

1 stop4h 16m

Deal found 9/16

$519

Sat 10/246:15 am -

1 stop4h 00m

Sun 10/2510:15 am -

1 stop3h 10m

Deal found 9/15

$329

Thu 11/126:00 pm -

1 stop4h 00m

Sun 11/154:40 pm -

1 stop3h 55m

Deal found 9/14

$331

Thu 10/2212:00 pm -

Nonstop2h 25m

Sun 10/255:00 am -

1 stop6h 20m

Deal found 9/14

$331

Thu 11/127:40 pm -

Nonstop2h 20m

Mon 11/166:15 pm -

Nonstop2h 05m

Deal found 9/16

$334

Fri 10/98:00 am -

Nonstop2h 25m

Sun 10/118:20 am -

Nonstop2h 00m

Deal found 9/14

$367

Last-minute flights from Washington, D.C. to St. Louis
Discover last-minute flight deals from Washington, D.C. to St. Louis. Data last updated September 17, 2026 and is based on user searches.

Mon 10/127:50 am -

1 stop10h 50m

Mon 10/196:35 pm -

1 stop4h 46m

Deal found 9/14

$237

Wed 10/1410:22 am -

1 stop8h 18m

Wed 10/216:35 pm -

1 stop4h 59m

Deal found 9/12

$115

Wed 10/1410:22 am -

1 stop8h 18m

Mon 10/196:35 pm -

1 stop13h 52m

Deal found 9/16

$141

Wed 10/1410:22 am -

1 stop8h 18m

Fri 10/236:35 pm -

1 stop13h 52m

Deal found 9/16

$148

Thu 10/159:12 pm -

1 stop21h 28m

Mon 10/196:35 pm -

1 stop21h 12m

Deal found 9/13

$128

Thu 10/159:12 pm -

1 stop21h 28m

Wed 10/216:35 pm -

1 stop13h 52m

Deal found 9/16

$168

Thu 10/156:00 am -

1 stop31h 35m

Thu 10/224:30 pm -

1 stop16h 47m

Deal found 9/16

$239

Sat 10/176:40 pm -

Nonstop2h 30m

Tue 10/2010:20 am -

1 stop3h 10m

Deal found 9/14

$237

Sat 10/175:55 pm -

Nonstop2h 26m

Tue 10/207:01 pm -

1 stop4h 57m

Deal found 9/16

$241

Mon 10/1910:22 am -

1 stop8h 18m

Wed 10/216:35 pm -

1 stop13h 52m

Deal found 9/16

$162

Wed 10/2110:22 am -

1 stop8h 18m

Mon 10/266:35 pm -

1 stop14h 15m

Deal found 9/13

$132

Wed 10/285:40 am -

1 stop13h 00m

Fri 10/306:44 pm -

1 stop4h 49m

Deal found 9/12

$142

One-way flights from Washington, D.C. to St. Louis
Search for one-way flight options from Washington, D.C. to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.

Wed 11/1110:45 am -

1 stop7h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/12

$58

Wed 10/1410:22 am -

1 stop8h 18m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/13

$63

Wed 10/76:38 am -

1 stop7h 32m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$67

Tue 11/109:12 pm -

1 stop21h 28m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/13

$71

Tue 10/139:12 pm -

1 stop21h 28m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$72

Tue 10/610:22 am -

1 stop27h 48m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/14

$82

Tue 11/177:05 pm -

2 stops23h 35m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/16

$92

Sat 10/105:01 am -

1 stop4h 36m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/15

$126

Tue 10/135:35 pm -

1 stop4h 16m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/15

$126

Sun 10/2511:12 am -

2 stops31h 28m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/15

$128

Thu 11/122:40 pm -

Nonstop2h 25m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/15

$128

Thu 10/291:00 pm -

2 stops29h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 9/16

$129

Find flight deals from Washington, D.C. to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$103 (Kiwi.com)
One-way from	$58 (Priceline)
Popular in	July
Cheapest in	October
Average price	$349
Good round-trip deal	$296 or less
Good one-way deal	$173 or less

Provider with most accurate pricing for Washington, D.C. (WAS)-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Lambert-St Louis flights.

Search Deals

From Washington, D.C. (WAS) to Lambert-St Louis

Search Deals

One-way flight from Washington, D.C. (WAS) to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($17 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Price to beat on a round-trip flight from Washington, D.C. (WAS) to Lambert-St Louis.

Search Deals

Price to beat on a one-way flight from Washington, D.C. (WAS) to Lambert-St Louis.

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Tue 10/13

5:35 pm-8:51 pm

1 stop4h 16m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$126

Washington, D.C.St. Louis

IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis

IADSTL

Washington, D.C. Dulles Intl

Mon 11/23

8:40 am-10:12 am

Nonstop2h 32m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$128

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Tue 12/15

8:50 pm-10:10 pm

Nonstop2h 20m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$135

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Thu 1/14

11:00 am-4:50 pm

1 stop6h 50m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Sat 11/14

2:00 pm-8:09 pm

1 stop7h 09m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Mon 11/16

6:30 pm-11:56 pm

1 stop6h 26m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Sat 11/14

12:26 pm-4:23 pm

1 stop4h 57m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Wed 10/14

6:10 am-11:47 am

1 stop6h 37m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Sat 12/12

3:00 pm-7:35 pm

2 stops5h 35m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$143

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Thu 11/12

12:00 pm-7:10 pm

2 stops8h 10m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 58 resultsSorted by cheapest first

...

Compare providers for flights from Washington, D.C. to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to St. Louis in September.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Washington, D.C.-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C.-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Washington, D.C. to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington, D.C. with our price prediction graph.

WAS-STL

BWI-STL

IAD-STL

DCA-STL

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to St. Louis

WAS-STL

BWI-STL

IAD-STL

DCA-STL

What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $346). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $448). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WAS to STL?

It’s optimal to fly from Washington, D.C. to St. Louis at noon. By choosing this option you can save up to 11% on the cost of your flight, compared to a flight in the afternoon.

Weekly flight availability from Washington, D.C. to St. Louis

The most flights from WAS to STL are scheduled on a Monday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

How much does it cost to fly round-trip from Washington, D.C. to St. Louis?

Airfare is below average for this route at the moment.

Washington, D.C. to St. Louis flights typically cost between $291 and $499 in November.
The cheapest round-trip price found within the last 5 days was $103 on Frontier (Nov 10-Nov 16).

How far ahead should I book a flight from Washington, D.C. to St. Louis?

To ensure you get the cheapest price possible for a flight from Washington, D.C. to St. Louis, you should look to book at least 47 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest day to fly from Washington, D.C. to St. Louis?

Travelers seeking maximum savings on their Washington, D.C. to St. Louis flight should consider departing on Sunday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Washington, D.C. to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to St. Louis trip

Our travel experts

Emily Zemler

Expert on DCA

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Taryn White

Expert on STL

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Ramsey Qubein

Expert on IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

See what other customers who have flown with Southwest,Delta, andUnited Airlines from Washington, D.C. to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,188 reviews

Reviews

1 / 20

10.0

Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.

Southwest

8.0

Very good

4,188 reviews

Southwest

8.0

Very good

4,188 reviews

Reviews

1 / 20

10.0

Excellent

Courtney,Sep 2026

DEN - STL

Delta

7.8

Good

8,579 reviews

Southwest

8.0

Very good

4,188 reviews

Reviews

1 / 20

10.0

Excellent

Courtney,Sep 2026

DEN - STL

United Airlines

7.4

Good

10,213 reviews

Southwest

8.0

Very good

4,188 reviews

Reviews

1 / 20

10.0

Excellent

Courtney,Sep 2026

DEN - STL

American Airlines

7.1

Good

12,075 reviews

Southwest

8.0

Very good

4,188 reviews

Reviews

1 / 20

10.0

Excellent

Courtney,Sep 2026

DEN - STL

Frontier

5.6

Fair

2,600 reviews

Southwest

8.0

Very good

4,188 reviews

Reviews

1 / 20

10.0

Excellent

Courtney,Sep 2026

DEN - STL

Related info for your journey

What airport do you fly into for flights to St. Louis from Washington, D.C.?
Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to St. Louis. 5 airlines have flights to Lambert-St Louis from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Lambert-St Louis should not be difficult; the airport handles an average of 13 inbound flights from Washington, D.C. per day.
How long is the flight from Washington, D.C. to St. Louis?
A quick flight from Washington, D.C. to St. Louis can take about 4h 20m. Southwest provides one of the quickest options available for as low as $241. There are 717 mi between Washington, D.C. and St. Louis. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?
Our cheapest airline available from Washington, D.C. to St. Louis is Frontier. Our recent data shows that you can find tickets from as low as $78 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $124 and $204 round-trip. These flights start at 78% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?
To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $60. United Airlines flights start at $100 while deals on American Airlines start at $118 one-way.
What are the most popular routes from Washington, D.C. to St. Louis?
When deciding which route to take from Washington, D.C. to St. Louis consider Washington, D.C. Dulles Intl - Lambert-St Louis, Baltimore/Washington - Lambert-St Louis or Washington, D.C. Reagan-National - Lambert-St Louis as they are the most popular.
What are the most reliable airlines from Washington, D.C. to St. Louis?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. to St. Louis on time: Avianca (73%), Copa Airlines (73%), Brussels Airlines (63%).
What are the cheapest flights from Washington, D.C. to St. Louis?
The cheapest flight price from Washington, D.C. to St. Louis is $207. On average you can expect to pay $730. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $163.
Can I find deals for flights from Washington, D.C. to St. Louis that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to St. Louis.
Can I find deals for business class flights from Washington, D.C. to St. Louis?
Yes. Cheapflights offers flight deals from Washington, D.C. to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. to St. Louis?
Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $346). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $448). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 5 airlines flying from Washington, D.C. to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$78	Average$201	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$124	Average$334	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$204	Average$371	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$235	Average$433	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$278	Average$567	FlexibilityNo cancel fee	On-time69%

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$58+ Cheap flights from Washington, D.C. (WAS) to St. Louis (STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/11. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to St. Louis with Cheapflights

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Cheap flight deals from Washington, D.C. to St. Louis

Cheapest flights from Washington, D.C. to St. LouisExplore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.

Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.

Best flights from Washington, D.C. to St. LouisDiscover carefully curated flight deals from Washington, D.C. to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.

Discover carefully curated flight deals from Washington, D.C. to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.

Last-minute flights from Washington, D.C. to St. LouisDiscover last-minute flight deals from Washington, D.C. to St. Louis. Data last updated September 17, 2026 and is based on user searches.

Discover last-minute flight deals from Washington, D.C. to St. Louis. Data last updated September 17, 2026 and is based on user searches.

One-way flights from Washington, D.C. to St. LouisSearch for one-way flight options from Washington, D.C. to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.

Search for one-way flight options from Washington, D.C. to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.

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

Compare providers for flights from Washington, D.C. to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to St. Louis in September.

Best time to book a flight from Washington, D.C. to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington, D.C. with our price prediction graph.

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What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

What is the cheapest time of day to fly from WAS to STL?

Find hourly flight availability from Washington, D.C. to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2026.

It’s optimal to fly from Washington, D.C. to St. Louis at noon. By choosing this option you can save up to 11% on the cost of your flight, compared to a flight in the afternoon.

Weekly flight availability from Washington, D.C. to St. Louis

The most flights from WAS to STL are scheduled on a Monday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

How much does it cost to fly round-trip from Washington, D.C. to St. Louis?

Airfare is below average for this route at the moment.

Washington, D.C. to St. Louis flights typically cost between $291 and $499 in November.The cheapest round-trip price found within the last 5 days was $103 on Frontier (Nov 10-Nov 16).

How far ahead should I book a flight from Washington, D.C. to St. Louis?

To ensure you get the cheapest price possible for a flight from Washington, D.C. to St. Louis, you should look to book at least 47 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest day to fly from Washington, D.C. to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to St. Louis. Price data was last updated on September 12, 2026.

Travelers seeking maximum savings on their Washington, D.C. to St. Louis flight should consider departing on Sunday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Washington, D.C. to St. Louis flights

AI-powered summary based on content written by travel experts. AI can make mistakes.

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to St. Louis trip

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Reviews of airlines servicing St. Louis

See what other customers who have flown with Southwest,Delta, andUnited Airlines from Washington, D.C. to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly into for flights to St. Louis from Washington, D.C.?

How long is the flight from Washington, D.C. to St. Louis?

What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?

What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?

What are the most popular routes from Washington, D.C. to St. Louis?

What are the most reliable airlines from Washington, D.C. to St. Louis?

What are the cheapest flights from Washington, D.C. to St. Louis?

Can I find deals for flights from Washington, D.C. to St. Louis that include hotel bookings?

How can I find direct flights from Washington, D.C. to St. Louis?

Can I find deals for business class flights from Washington, D.C. to St. Louis?

What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

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Washington, D.C. and St. Louis flights

Browse other Washington, D.C. and St. Louis flight options. Last updated on September 17, 2026.

Other flights from Washington, D.C.

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Cheapest flights from Washington, D.C. to St. Louis
Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.

Best flights from Washington, D.C. to St. Louis
Discover carefully curated flight deals from Washington, D.C. to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.

Last-minute flights from Washington, D.C. to St. Louis
Discover last-minute flight deals from Washington, D.C. to St. Louis. Data last updated September 17, 2026 and is based on user searches.

One-way flights from Washington, D.C. to St. Louis
Search for one-way flight options from Washington, D.C. to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.

Washington, D.C. to St. Louis flights typically cost between $291 and $499 in November.
The cheapest round-trip price found within the last 5 days was $103 on Frontier (Nov 10-Nov 16).