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$55+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
mar. 2 — mar. 91
dom. 3/2
dom. 3/9
1 adult, Economy
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The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or October, booked 89 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 febrero 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$138
(Mytrip)

One-way from

$55
(Cheapflightsfares)

Popular in

March

Cheapest in

August

Average price

$369

Good round-trip deal

$277 or less

Good one-way deal

$109 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Lambert-St Louis flights.
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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
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
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 February 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 febrero 25, 2025.

This Mytrip deal was found by Cheapflights users on 2/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/116:50 amBWI - STL
1 stop10h 52mSpirit Airlines
jue. 3/135:38 pmSTL - BWI
1 stop6h 19mSpirit Airlines
Deal found 2/25$163
This CheapOair deal was found by Cheapflights users on 2/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/139:00 amBWI - STL
1 stop10h 32mMultiple Airlines
jue. 5/155:47 pmSTL - BWI
1 stop23h 49mMultiple Airlines
Deal found 2/25$189
This American Airlines deal was found by Cheapflights users on 2/25. 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.
mar. 3/115:00 amBWI - STL
1 stop4h 09mAmerican Airlines
mar. 3/111:51 pmSTL - BWI
1 stop4h 34mAmerican Airlines
Deal found 2/25$197
This United Airlines deal was found by Cheapflights users on 2/24. 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.
jue. 3/278:35 amIAD - STL
Nonstop2h 33mUnited Airlines
lun. 3/318:25 amSTL - IAD
Nonstop2h 09mUnited Airlines
Deal found 2/24$229
This American Airlines deal was found by Cheapflights users on 2/24. 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.
mar. 4/159:05 pmDCA - STL
Nonstop2h 20mAmerican Airlines
sáb. 4/1910:48 amSTL - DCA
Nonstop2h 02mAmerican Airlines
Deal found 2/24$229
This Delta deal was found by Cheapflights users on 2/25. 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.
dom. 4/206:00 amIAD - STL
1 stop6h 45mDelta
jue. 4/246:00 amSTL - IAD
1 stop4h 23mDelta
Deal found 2/25$233
This Delta deal was found by Cheapflights users on 2/25. 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.
jue. 5/298:59 amDCA - STL
1 stop6h 36mDelta
lun. 6/23:40 pmSTL - DCA
1 stop7h 03mDelta
Deal found 2/25$233
This Southwest deal was found by Cheapflights users on 2/24. 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.
mar. 4/221:10 pmDCA - STL
2 stops6h 45mSouthwest
lun. 4/285:20 pmSTL - DCA
1 stop4h 35mSouthwest
Deal found 2/24$234
This Mytrip deal was found by Cheapflights users on 2/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 3/155:54 pmIAD - STL
1 stop6h 55mFrontier
lun. 3/175:24 pmSTL - IAD
1 stop22h 30mFrontier
Deal found 2/24$252
This Booking.com deal was found by Cheapflights users on 2/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 4/259:12 pmBWI - STL
1 stop27h 52mFrontier
lun. 4/285:41 pmSTL - BWI
1 stop20h 26mFrontier
Deal found 2/24$254
This United Airlines deal was found by Cheapflights users on 2/24. 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.
lun. 4/77:25 amDCA - STL
1 stop5h 55mUnited Airlines
lun. 4/145:35 pmSTL - DCA
1 stop4h 00mUnited Airlines
Deal found 2/24$262
This Southwest deal was found by Cheapflights users on 2/25. 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.
jue. 3/206:05 amBWI - STL
Nonstop2h 25mSouthwest
lun. 3/244:55 pmSTL - BWI
1 stop3h 50mSouthwest
Deal found 2/25$276

Find flights from Washington, D.C. to St. Louis within your budget

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 febrero 25, 2025.

Fly from

Washington, D.C.

Fly to

St. Louis

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

mar. 3/11

6:50 am-4:42 pm

1 stop10h 52m

Lambert-St Louis

jue. 3/13

5:38 pm-12:57 am

1 stop6h 19m

$163

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

mar. 5/13

9:00 am-6:32 pm

1 stop10h 32m

Lambert-St Louis

jue. 5/15

5:47 pm-6:36 pm

1 stop23h 49m

$189

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

mar. 3/11

5:00 am-8:09 am

1 stop4h 09m

Lambert-St Louis

mar. 3/11

1:51 pm-7:25 pm

1 stop4h 34m

$197

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

jue. 3/27

8:35 am-10:08 am

Nonstop2h 33m

Lambert-St Louis

lun. 3/31

8:25 am-11:34 am

Nonstop2h 09m

$229

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 4/15

9:05 pm-10:25 pm

Nonstop2h 20m

Lambert-St Louis

sáb. 4/19

10:48 am-1:50 pm

Nonstop2h 02m

$229

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

dom. 4/20

6:00 am-11:45 am

1 stop6h 45m

Lambert-St Louis

jue. 4/24

6:00 am-11:23 am

1 stop4h 23m

$233

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 4/10

8:00 am-9:10 am

Nonstop2h 10m

Lambert-St Louis

jue. 4/10

1:55 pm-10:10 pm

1 stop7h 15m

$233

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

lun. 4/14

7:35 pm-11:36 pm

1 stop5h 01m

Lambert-St Louis

mar. 4/22

6:08 am-12:40 pm

1 stop5h 32m

$249

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

sáb. 3/15

5:54 pm-11:49 pm

1 stop6h 55m

Lambert-St Louis

lun. 3/17

5:24 pm-4:54 pm

1 stop22h 30m

$252

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

vie. 4/25

9:12 pm-12:04 am

1 stop27h 52m

Lambert-St Louis

lun. 4/28

5:41 pm-3:07 pm

1 stop20h 26m

$254

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/25

Showing 1-10 of 35 results
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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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*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.

Travel insights for flights from Washington, D.C. to St. Louis

Get recent, data-driven insights about flights from Washington, D.C. to St. Louis including ideal travel times, pricing trends, and more.

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 February 14, 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 89 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 febrero 25, 2025.

It’s optimal to fly from Washington, D.C. to St. Louis at noon. By choosing this option you can save up to 23% on the cost of your flight, compared to a flight in the morning.

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 February 23, 2025.

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. Saturday afternoons 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 febrero 25, 2025.

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 (8 on average).

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

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.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

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).

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 febrero 25, 2025.
To help decide which airline to fly from Washington, D.C. to St. Louis, see what other customers have to say about Southwest, Delta and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,374 reviews

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest
8.1
Very good
4,374 reviews
Southwest
8.1
Very good
4,374 reviews

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Delta
8.0
Very good
8,165 reviews
Southwest
8.1
Very good
4,374 reviews

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

United Airlines
7.4
Good
8,733 reviews
Southwest
8.1
Very good
4,374 reviews

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,374 reviews

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Sun Country Air
7.0
Good
371 reviews
Southwest
8.1
Very good
4,374 reviews

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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. 6 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 Spirit Airlines. Our recent data shows that you can find tickets from as low as $138 on this airline. Additional options worth looking into are Frontier and American Airlines, starting at $140 and $197 round-trip. These flights start at 57% 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 Spirit Airlines, which is currently one of the cheapest options available, starting at $55. Delta flights start at $99 while deals on Southwest start at $100 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: GoJet (77%), Avianca (77%), Copa Airlines (77%).

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

    The cheapest flight price from Washington, D.C. to St. Louis is $137. On average you can expect to pay $365. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $234.

  • 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
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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Top 6 airlines flying from Washington, D.C. to St. Louis

Discover the top 6 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 febrero 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$172FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$133Average$231FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$158Average$398FlexibilityNo cancel feeOn-time69%
DeltaCheapest$175Average$319FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$183Average$358FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$220Average$363FlexibilityNo cancel feeOn-time63%
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