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$67+ Cheap flights from Washington, D.C. (WAS) to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Sep 11 — Sep 181
Fri 9/11
Fri 9/18
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in October or September, booked 49 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 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 August 12, 2026.

This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/79:25 pm -
1 stop13h 15m
Mon 10/1210:35 am -
1 stop21h 22m
Deal found 8/7$134
This Kiwi.com deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:29 pm -
1 stop15h 11m
Mon 10/1910:35 am -
1 stop13h 09m
Deal found 8/10$139
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:00 am -
1 stop8h 10m
Mon 9/142:29 pm -
1 stop17h 56m
Deal found 8/7$140
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/179:25 pm -
1 stop16h 45m
Mon 9/212:29 pm -
1 stop17h 56m
Deal found 8/11$141
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:29 pm -
1 stop13h 11m
Mon 10/2610:35 am -
1 stop20h 54m
Deal found 8/11$143
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:00 am -
1 stop8h 10m
Fri 9/182:29 pm -
1 stop7h 35m
Deal found 8/7$145
This Kiwi.com deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:29 pm -
1 stop13h 11m
Mon 10/1910:35 am -
1 stop13h 09m
Deal found 8/10$148
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:29 pm -
1 stop15h 11m
Sun 10/1810:35 am -
1 stop13h 09m
Deal found 8/11$150
This Kiwi.com deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:38 am -
1 stop7h 32m
Mon 9/282:29 pm -
1 stop17h 56m
Deal found 8/9$151
This Kiwi.com deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/279:20 pm -
1 stop13h 20m
Thu 10/2910:35 am -
1 stop7h 01m
Deal found 8/10$152
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:45 am -
1 stop11h 37m
Wed 9/92:29 pm -
1 stop6h 29m
Deal found 8/11$153
This Kiwi.com deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:50 am -
1 stop6h 20m
Sun 10/1110:35 am -
2 stops25h 08m
Deal found 8/8$245

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

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$134
(Kiwi.com)

One-way from

$67
(Kiwi.com)

Popular in

July

Cheapest in

October

Average price

$339

Good round-trip deal

$313 or less

Good one-way deal

$180 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 August 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

 
Customize your flight search to find flights from Washington, D.C. 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, Cheapflights users made 2,558,603 searches. Data last updated August 12, 2026.
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

Sat 9/5

8:15 am-9:35 am

Nonstop2h 20m

Lambert-St Louis

Tue 9/8

7:10 pm-10:10 pm

Nonstop2h 00m

$258

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Thu 10/8

3:00 pm-7:00 pm

1 stop5h 00m

Lambert-St Louis

Mon 10/12

7:50 pm-10:50 pm

Nonstop2h 00m

$276

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Fri 9/11

8:30 pm-9:45 pm

Nonstop2h 15m

Lambert-St Louis

Mon 9/14

4:55 pm-11:20 pm

1 stop5h 25m

$277

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Sat 9/5

6:00 am-12:35 pm

2 stops7h 35m

Lambert-St Louis

Wed 9/16

10:45 am-3:45 pm

1 stop4h 00m

$277

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Tue 9/8

10:21 am-2:08 pm

1 stop4h 47m

Lambert-St Louis

Tue 9/15

12:00 pm-7:23 pm

1 stop6h 23m

$278

BaltimoreSt. Louis

BWI Baltimore/Washington - STL Lambert-St Louis

BWISTL

Baltimore/Washington

Wed 9/23

6:35 am-7:45 am

Nonstop2h 10m

Lambert-St Louis

Sat 9/26

1:40 pm-6:55 pm

1 stop4h 15m

$279

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Thu 9/24

12:15 pm-1:25 pm

Nonstop2h 10m

Lambert-St Louis

Mon 9/28

10:10 am-6:00 pm

1 stop6h 50m

$289

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Sat 9/26

6:10 am-9:29 am

1 stop4h 19m

Lambert-St Louis

Fri 10/2

2:30 pm-9:43 pm

1 stop6h 13m

$291

Washington, D.C.St. Louis

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

IADSTL

Washington, D.C. Dulles Intl

Fri 9/4

6:16 am-11:17 am

1 stop6h 01m

Lambert-St Louis

Sun 9/6

8:40 am-11:54 am

Nonstop2h 14m

$292

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Fri 9/11

6:50 pm-8:00 pm

Nonstop2h 10m

Lambert-St Louis

Sun 9/13

7:50 pm-10:50 pm

Nonstop2h 00m

$294

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 60 resultsSorted by cheapest first
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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 August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice 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.
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

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 $339). 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?

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 August 12, 2026.

It’s optimal to fly from Washington, D.C. to St. Louis at noon. By choosing this option you can save up to 17% on the cost of your flight, compared to a flight in the afternoon.

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

Explore weekly flight availability from Washington, D.C. to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 12, 2026.

The most flights from WAS to STL are scheduled on a Tuesday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 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 $287 and $454 in October.
The cheapest round-trip price found within the last 5 days was $134 on Frontier (Oct 7-Oct 12).

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 August 8, 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
Our travel experts
Emily Zemler

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.

Read more
Taryn White

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.

Read more
Ramsey Qubein

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.

Read more

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated August 12, 2026.
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
4,220 reviews

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
Southwest
8.0
Very good
4,220 reviews
Southwest
8.0
Very good
4,220 reviews

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
Delta
7.8
Good
8,505 reviews
Southwest
8.0
Very good
4,220 reviews

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
United Airlines
7.4
Good
10,111 reviews
Southwest
8.0
Very good
4,220 reviews

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
American Airlines
7.1
Good
11,911 reviews
Southwest
8.0
Very good
4,220 reviews

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
Frontier
5.6
Fair
2,701 reviews
Southwest
8.0
Very good
4,220 reviews

Boarding

8.1

Overall

8.0

Food

7.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 12 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 2h 20m. Southwest provides one of the quickest options available for as low as $258. 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. American Airlines flights start at $118 while deals on Southwest 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, Washington, D.C. Reagan-National - Lambert-St Louis or Baltimore/Washington - 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: Lufthansa (86%), GoJet (85%), United Airlines (85%).

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

    The cheapest flight price from Washington, D.C. to St. Louis is $256. On average you can expect to pay $610. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $184.

  • 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 $339). 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.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington

Browse thousands of different options on Cheapflights for your next trip

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

Discover the top 5 airlines that operate flights from Washington, D.C. to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$201FlexibilityNo cancel feeOn-time62%
DeltaCheapest$124Average$356FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$204Average$374FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$232Average$421FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$278Average$558FlexibilityNo cancel feeOn-time69%

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