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Washington, D.C.

$57+ Cheap flights from St. Louis (STL) to Washington, D.C. (WAS)

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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — WAS
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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The best prices from Lambert-St Louis to Washington, D.C. are usually found in November or August, booked 65 days in advance, depart on a Friday or Thursday and return on a Wednesday

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

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Washington, D.C. (WAS). 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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$115
(Booking.com)

One-way from

$57
(Mytrip)

Popular in

October

Cheapest in

November

Average price

$293

Good round-trip deal

$269 or less

Good one-way deal

$114 or less
Provider with most accurate pricing for Lambert-St Louis-Washington, D.C. (WAS) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Washington, D.C. (WAS) flights.
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From Lambert-St Louis to Washington, D.C. (WAS)
Search Deals
One-way flight from Lambert-St Louis to Washington, D.C. (WAS)
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High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Washington, D.C. (WAS).
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Price to beat on a one-way flight from Lambert-St Louis to Washington, D.C. (WAS).
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Find flight deals from St. Louis to Washington, D.C.

Cheapest flights from St. Louis to Washington, D.C.
Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This Booking.com deal was found by Cheapflights users on 2/19. 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.
Wed 4/24:57 pmSTL - BWI
1 stop21h 00mFrontier
Mon 4/78:25 amBWI - STL
1 stop16h 21mFrontier
Deal found 2/19$115
This FlightHub deal was found by Cheapflights users on 2/20. 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.
Thu 4/246:11 pmSTL - BWI
1 stop5h 45mMultiple Airlines
Sun 4/276:38 pmBWI - STL
1 stop6h 26mMultiple Airlines
Deal found 2/20$139
This FlightHub deal was found by Cheapflights users on 2/20. 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.
Tue 4/156:11 pmSTL - BWI
1 stop22h 17mSpirit Airlines
Wed 4/236:33 pmBWI - STL
1 stop23h 43mSpirit Airlines
Deal found 2/20$157
This Southwest deal was found by Cheapflights users on 2/20. 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 4/1610:30 amSTL - BWI
1 stop3h 55mSouthwest
Mon 4/214:45 pmBWI - STL
1 stop4h 50mSouthwest
Deal found 2/20$192
This Delta deal was found by Cheapflights users on 2/20. 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 3/2510:19 amSTL - BWI
1 stop4h 21mDelta
Wed 3/266:00 amBWI - STL
1 stop7h 00mDelta
Deal found 2/20$197
This Booking.com deal was found by Cheapflights users on 2/19. 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.
Mon 3/37:04 pmSTL - DCA
1 stop25h 55mFrontier
Thu 3/67:00 amDCA - STL
1 stop27h 16mFrontier
Deal found 2/19$210
This Frontier deal was found by Cheapflights users on 2/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1010:36 amSTL - IAD
1 stop5h 37mFrontier
Fri 3/144:10 pmIAD - STL
1 stop8h 39mFrontier
Deal found 2/19$210
This Delta deal was found by Cheapflights users on 2/20. 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.
Fri 3/214:45 pmSTL - DCA
1 stop4h 49mDelta
Tue 3/252:40 pmDCA - STL
1 stop7h 12mDelta
Deal found 2/20$217
This Delta deal was found by Cheapflights users on 2/20. 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 3/84:40 pmSTL - IAD
1 stop6h 42mDelta
Mon 3/107:35 amIAD - STL
1 stop5h 25mDelta
Deal found 2/20$217
This Southwest deal was found by Cheapflights users on 2/19. 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.
Fri 4/48:05 pmSTL - DCA
Nonstop1h 55mSouthwest
Mon 4/74:05 pmDCA - STL
1 stop4h 55mSouthwest
Deal found 2/19$223
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Sat 3/81:51 pmSTL - DCA
1 stop5h 43mAmerican Airlines
Mon 3/108:58 pmDCA - STL
Nonstop2h 24mAmerican Airlines
Deal found 2/20$227
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Mon 3/248:25 amSTL - IAD
Nonstop2h 14mUnited Airlines
Thu 3/278:35 amIAD - STL
Nonstop2h 33mUnited Airlines
Deal found 2/19$229

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

Customize your flight search to find flights from St. Louis to Washington, D.C. 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 February 20, 2025.

Fly from

St. Louis

Fly to

Washington, D.C.

Route

Depart

Return

Price

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 4/2

4:57 pm-2:57 pm

1 stop21h 00m

Baltimore/Washington

Mon 4/7

8:25 am-11:46 pm

1 stop16h 21m

$115

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 4/24

6:11 pm-12:56 am

1 stop5h 45m

Baltimore/Washington

Sun 4/27

6:38 pm-12:04 am

1 stop6h 26m

$139

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Tue 4/15

6:11 pm-5:28 pm

1 stop22h 17m

Baltimore/Washington

Wed 4/23

6:33 pm-5:16 pm

1 stop23h 43m

$157

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 4/16

10:30 am-3:25 pm

1 stop3h 55m

Baltimore/Washington

Mon 4/21

4:45 pm-8:35 pm

1 stop4h 50m

$192

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Tue 3/25

10:19 am-3:40 pm

1 stop4h 21m

Baltimore/Washington

Wed 3/26

6:00 am-12:00 pm

1 stop7h 00m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 3/3

7:04 pm-9:59 pm

1 stop25h 55m

Washington, D.C. Reagan-National

Thu 3/6

7:00 am-9:16 am

1 stop27h 16m

$210

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Mon 3/10

10:36 am-5:13 pm

1 stop5h 37m

Washington, D.C. Dulles Intl

Fri 3/14

4:10 pm-11:49 pm

1 stop8h 39m

$210

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 3/21

4:45 pm-10:34 pm

1 stop4h 49m

Washington, D.C. Reagan-National

Wed 3/26

6:00 am-9:14 am

1 stop4h 14m

$217

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 3/8

4:40 pm-12:22 am

1 stop6h 42m

Washington, D.C. Dulles Intl

Mon 3/10

7:35 am-12:00 pm

1 stop5h 25m

$217

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 4/4

8:05 pm-11:00 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Mon 4/7

4:05 pm-8:00 pm

1 stop4h 55m

$223

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 36 results
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Compare providers for flights from St. Louis to Washington, D.C.

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 St. Louis to Washington, D.C. in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice 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 St. Louis-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Washington, D.C. flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Washington, D.C. 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 St. Louis-Washington, D.C. 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 St. Louis to Washington, D.C.

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Washington, D.C.. Price data was last updated on February 14, 2025.

Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Washington, D.C.. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $309). Flying from St. Louis to Washington, D.C. in June is currently the most expensive (average of $389). 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 STL to WAS?

Find hourly flight availability from St. Louis to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 20, 2025.

It’s typically best to fly out from St. Louis to Washington, D.C. in the evening. Doing so could potentially save you 73% on the flight price compared to flying at noon, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Washington, D.C.. Price data was last updated on February 16, 2025.

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

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

Explore weekly flight availability from St. Louis to Washington, D.C.. 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 February 20, 2025.

The most flights from STL to WAS are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C., 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 35.6 F).

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated February 20, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from St. Louis to Washington, D.C. to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Washington, D.C.. 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 from for flights from St. Louis to Washington, D.C.?

    If you book a flight to Washington, D.C. from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 10 flights from Lambert-St Louis to Washington, D.C. per day from 5 different airlines.

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

    Flying on Frontier is currently your cheapest option to Washington, D.C., with prices starting at $115. Additional round-trip tickets that might be worth considering are offered by Spirit Airlines and Southwest, with the lowest prices starting at $157 and $192, respectively. Frontier is 60% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $57. Users have also found prices from $67 and $99 on Spirit Airlines and Delta, respectively.

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

    The most popular route from St. Louis to Washington, D.C. is Lambert-St Louis - Washington, D.C. Dulles Intl. You may also consider Lambert-St Louis - Baltimore/Washington or Lambert-St Louis - Washington, D.C. Reagan-National.

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

    The top 3 most reliable airlines when flying from St. Louis to Washington, D.C. are Avianca (87%), Copa Airlines (87%) and GoJet (80%).

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

    While on average a flight from St. Louis to Washington, D.C. is generally $645, our data shows the cheapest flight currently is $124. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $171 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Washington, D.C. 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 St. Louis to Washington, D.C.?

    Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $309). Flying from St. Louis to Washington, D.C. in June is currently the most expensive (average of $389). 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
Arlington
Alexandria
Fairfax
Springfield
Rockville
Tysons
Gaithersburg
Silver Spring
Fredericksburg
Linthicum Heights
Laurel
Falls Church
Woodbridge
Easton
Herndon
Bowie
Reston
National Harbor
Oxon Hill
Gettysburg

Browse thousands of different options on Cheapflights for your next trip

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

Discover the top 5 airlines that operate flights from St. Louis to Washington, D.C.. 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$98Average$175FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$129Average$318FlexibilityNo cancel feeOn-time71%
DeltaCheapest$177Average$301FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$200Average$345FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$211Average$375FlexibilityNo cancel feeOn-time69%
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