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$50+ 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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or May, booked 61 days in advance, depart on a Wednesday or Friday and return on a Friday

Cheap 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 July 3, 2025.

Round-trip from

$109
(Priceline)

One-way from

$50
(Priceline)

Popular in

March

Cheapest in

August

Average price

$321

Good round-trip deal

$252 or less

Good one-way deal

$149 or less
From Washington, D.C. (WAS) to Lambert-St Louis
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One-way flight from Washington, D.C. (WAS) to Lambert-St Louis
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Highest demand for flights based on searches. 7% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Lambert-St Louis.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Lambert-St Louis.
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Find 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 July 3, 2025.

This Priceline deal was found by Cheapflights users on 7/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/76:25 amBWI - STL
1 stop9h 39mFrontier
Mon 9/224:00 pmSTL - BWI
1 stop7h 17mFrontier
Deal found 7/2$109
This Priceline deal was found by Cheapflights users on 6/30. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/147:15 amBWI - STL
1 stop7h 19mMultiple Airlines
Mon 8/182:30 pmSTL - BWI
1 stop6h 39mMultiple Airlines
Deal found 6/30$143
This FlightHub deal was found by Cheapflights users on 7/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/162:30 pmBWI - STL
1 stop24h 02mSpirit Airlines
Mon 8/182:30 pmSTL - BWI
1 stop6h 39mSpirit Airlines
Deal found 7/1$150
This American Airlines deal was found by Cheapflights users on 7/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/267:58 amBWI - STL
1 stop6h 53mAmerican Airlines
Wed 8/273:43 pmSTL - BWI
1 stop6h 26mAmerican Airlines
Deal found 7/3$177
This Southwest deal was found by Cheapflights users on 7/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1410:10 pmBWI - STL
Nonstop2h 15mSouthwest
Mon 8/189:05 amSTL - BWI
Nonstop2h 00mSouthwest
Deal found 7/3$197
This Priceline deal was found by Cheapflights users on 7/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/711:04 amIAD - STL
1 stop9h 19mFrontier
Tue 11/255:25 pmSTL - IAD
1 stop5h 28mFrontier
Deal found 7/2$201
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/208:00 amDCA - STL
Nonstop2h 10mSouthwest
Mon 8/259:50 amSTL - DCA
1 stop4h 05mSouthwest
Deal found 7/2$203
This American Airlines deal was found by Cheapflights users on 7/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/297:51 pmDCA - STL
Nonstop2h 11mAmerican Airlines
Sun 8/316:02 amSTL - DCA
Nonstop2h 01mAmerican Airlines
Deal found 7/2$204
This Delta deal was found by Cheapflights users on 7/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/267:22 amIAD - STL
1 stop6h 09mDelta
Wed 8/277:00 amSTL - IAD
1 stop6h 31mDelta
Deal found 7/3$217
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/126:00 pmDCA - STL
1 stop5h 45mUnited Airlines
Tue 8/195:30 pmSTL - DCA
1 stop4h 13mUnited Airlines
Deal found 7/1$217
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:00 amIAD - STL
1 stop5h 52mUnited Airlines
Fri 10/318:25 amSTL - IAD
Nonstop2h 06mUnited Airlines
Deal found 7/2$223
This Delta deal was found by Cheapflights users on 7/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/161:40 pmDCA - STL
1 stop6h 27mDelta
Mon 8/183:40 pmSTL - DCA
1 stop5h 08mDelta
Deal found 7/3$231

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 July 3, 2025.
Use the filters below to find and compare flights from Washington, D.C. to St. Louis that are best for you.

Fly from

Washington, D.C.

Fly to

St. Louis

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sun 9/7

6:25 am-3:04 pm

1 stop9h 39m

Lambert-St Louis

Mon 9/22

4:00 pm-12:17 am

1 stop7h 17m

$109

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 8/14

7:15 am-1:34 pm

1 stop7h 19m

Lambert-St Louis

Mon 8/18

2:30 pm-10:09 pm

1 stop6h 39m

$143

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 8/16

2:30 pm-1:32 pm

1 stop24h 02m

Lambert-St Louis

Mon 8/18

2:30 pm-10:09 pm

1 stop6h 39m

$150

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/26

7:58 am-1:51 pm

1 stop6h 53m

Lambert-St Louis

Wed 8/27

3:43 pm-11:09 pm

1 stop6h 26m

$177

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 8/14

10:10 pm-11:25 pm

Nonstop2h 15m

Lambert-St Louis

Mon 8/18

9:05 am-12:05 pm

Nonstop2h 00m

$197

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 8/7

11:04 am-7:23 pm

1 stop9h 19m

Lambert-St Louis

Tue 11/25

5:25 pm-11:53 pm

1 stop5h 28m

$201

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 8/20

8:00 am-9:10 am

Nonstop2h 10m

Lambert-St Louis

Mon 8/25

9:50 am-2:55 pm

1 stop4h 05m

$203

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 8/29

7:51 pm-9:02 pm

Nonstop2h 11m

Lambert-St Louis

Sun 8/31

6:02 am-9:03 am

Nonstop2h 01m

$204

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 8/26

7:22 am-12:31 pm

1 stop6h 09m

Lambert-St Louis

Wed 8/27

7:00 am-2:31 pm

1 stop6h 31m

$217

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 8/12

6:00 pm-10:45 pm

1 stop5h 45m

Lambert-St Louis

Tue 8/19

5:30 pm-10:43 pm

1 stop4h 13m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 33 results
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The best insider tips for Washington, D.C. to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to St. Louis trip
Airports
DCA

DCA is easily accessible via the Metro, offering a clean and affordable way to reach the airport from D.C. and nearby Maryland.

Read more about DCAby Emily Zemler
IAD

IAD's Aerotrain connects the main terminal to concourses, but pay attention to signage for the correct train direction.

Read more about IADby Ramsey Qubein
STL

STL's MetroLink offers a convenient and economical way to reach downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
Our travel experts
Emily Zemler

Emily Zemler

Expert on DCA

Emily Zemler

Emily Zemler

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

Taryn White

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

Ramsey Qubein

Ramsey Qubein

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to St. Louis. Price data was last updated on June 27, 2025.

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 61 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 month to book a flight from Washington, D.C. to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $356). 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 July 3, 2025.

It’s optimal to fly from Washington, D.C. to St. Louis in the evening. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight in the afternoon.

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 June 29, 2025.

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

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 July 3, 2025.

The most flights from WAS to STL are scheduled on a Thursday (16 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?

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 July 3, 2025.
See what other customers who have flown with Southwest, Delta, and United 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
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,982 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,861 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,086 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 11 inbound flights from Washington, D.C. per day.

  • 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 $109 on this airline. Additional options worth looking into are Spirit Airlines and American Airlines, starting at $149 and $177 round-trip. These flights start at 66% 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 $50. Spirit Airlines flights start at $79 while deals on United Airlines start at $99 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: GoJet (76%), Avianca (76%), Copa Airlines (76%).

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

    The cheapest flight price from Washington, D.C. to St. Louis is $181. On average you can expect to pay $421. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $216.

  • 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, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $356). 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 Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$221FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$158Average$324FlexibilityNo cancel feeOn-time71%
DeltaCheapest$169Average$286FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$198Average$347FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$265Average$477FlexibilityNo cancel feeOn-time69%

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