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Washington, D.C.

$59+ Cheap flights from St. Louis (STL) to Washington, D.C. (WAS)

STL — WAS
Nov 6 — Nov 131
Fri 11/6
Fri 11/13
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in October or September, booked 3 days in advance, depart on a Friday or Thursday and return on a Wednesday

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

Cheapest flights from St. Louis to Washington, D.C.

Wed 11/46:44 pm -
1 stop4h 49m
Wed 11/1110:41 am -
1 stop8h 01m
Deal found 10/5$131
Fri 11/66:34 pm -
1 stop4h 59m
Mon 11/96:24 am -
1 stop12h 18m
Deal found 10/5$138
Mon 12/712:02 pm -
1 stop19h 38m
Thu 12/106:50 pm -
1 stop17h 27m
Deal found 10/6$139
Wed 11/186:34 pm -
1 stop13h 28m
Thu 12/36:50 pm -
1 stop17h 27m
Deal found 10/5$140
Wed 11/186:34 pm -
1 stop4h 59m
Tue 12/16:50 pm -
1 stop17h 27m
Deal found 10/5$141
Wed 10/286:44 pm -
1 stop13h 18m
Thu 10/299:12 pm -
1 stop21h 28m
Deal found 10/3$150
Fri 11/66:34 pm -
1 stop4h 59m
Fri 11/136:29 am -
1 stop12h 13m
Deal found 10/5$152
Mon 11/166:34 pm -
1 stop14h 12m
Tue 11/177:05 pm -
2 stops23h 37m
Deal found 10/5$154
Mon 10/266:35 pm -
1 stop20h 39m
Thu 10/299:12 pm -
1 stop21h 28m
Deal found 10/3$158
Fri 11/136:34 pm -
1 stop4h 59m
Mon 11/1610:00 am -
1 stop8h 42m
Deal found 10/6$167
Mon 11/26:44 pm -
1 stop14h 06m
Mon 11/96:24 am -
1 stop12h 18m
Deal found 10/5$170
Mon 11/162:31 pm -
1 stop5h 10m
Tue 11/172:00 pm -
1 stop5h 13m
Deal found 10/6$251

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

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$131
(Frontier)

One-way from

$51
(Trip.com)

Popular in

May

Cheapest in

October

Average price

$295

Good round-trip deal

$343 or less

Good one-way deal

$205 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)
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One-way flight from Lambert-St Louis to Washington, D.C. (WAS)
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Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in October 2026
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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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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisWashington, D.C.

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

STLIAD

Lambert-St Louis

Thu 2/18

6:00 am-1:14 pm

1 stop6h 14m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$110

St. LouisWashington, D.C.

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

STLIAD

Lambert-St Louis

Wed 11/4

6:44 pm-10:21 am

2 stops14h 37m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$112

St. LouisWashington, D.C.

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

STLDCA

Lambert-St Louis

Thu 11/26

12:29 pm-5:37 pm

1 stop4h 08m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$115

St. LouisBaltimore

STL Lambert-St Louis - BWI Baltimore/Washington

STLBWI

Lambert-St Louis

Thu 10/29

5:00 am-10:29 am

1 stop4h 29m

Baltimore/Washington

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$115
Quickest round-trip

St. LouisWashington, D.C.

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

STLDCA

Lambert-St Louis

Thu 11/12

8:20 am-11:15 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$116

St. LouisWashington, D.C.

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

STLDCA

Lambert-St Louis

Tue 11/24

8:10 am-11:05 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$116

St. LouisWashington, D.C.

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

STLDCA

Lambert-St Louis

Sat 11/14

5:01 am-10:14 am

1 stop4h 13m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$126

St. LouisWashington, D.C.

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

STLIAD

Lambert-St Louis

Sat 11/14

12:20 pm-8:10 pm

1 stop6h 50m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$126

St. LouisWashington, D.C.

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

STLIAD

Lambert-St Louis

Thu 2/18

10:45 am-4:30 pm

1 stop4h 45m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$126

St. LouisWashington, D.C.

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

STLDCA

Lambert-St Louis

Thu 12/3

7:15 pm-10:10 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$128

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/5

Showing 1-10 of 57 resultsSorted by cheapest first
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Compare providers for flights from St. Louis to Washington, D.C.

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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

Cheapflights Insights

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

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

Currently, October is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $333). Flying from St. Louis to Washington, D.C. in February is currently the most expensive (average of $432). 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?

It’s typically best to fly out from St. Louis to Washington, D.C. in the evening. Doing so could potentially save you 40% on the flight price compared to flying in the afternoon, which is usually more expensive.

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

The most flights from STL to WAS 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 (2 on average).

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

Airfare is below average for this route at the moment.
St. Louis to Washington, D.C. flights typically cost between $218 and $359 in November.
The cheapest round-trip price found within the last 5 days was $131 on Frontier (Nov 4-Nov 11).

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

Booking 85 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 day to fly from St. Louis to Washington, D.C.?

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

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

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

Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican Airlines from St. Louis to Washington, D.C. by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,214 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Southwest
7.9
Good
4,214 reviews
Southwest
7.9
Good
4,214 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
United Airlines
7.4
Good
10,301 reviews
Southwest
7.9
Good
4,214 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
American Airlines
7.0
Good
12,129 reviews
Southwest
7.9
Good
4,214 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Frontier
5.5
Fair
2,553 reviews
Southwest
7.9
Good
4,214 reviews

Boarding

8.1

Overall

7.9

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

  • 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 9 flights from Lambert-St Louis to Washington, D.C. per day from 6 different airlines.

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

    There are many flights that can get you from St. Louis to Washington, D.C. in 4h 29m. Fly via Delta, Southwest, or United Airlines to get the fastest option. There are 736 mi between St. Louis and Washington, D.C.. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $90. Additional round-trip tickets that might be worth considering are offered by JetBlue and Delta, with the lowest prices starting at $200 and $203, respectively. Frontier is 74% 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 $72. Users have also found prices from $117 and $128 on American 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 - Washington, D.C. Reagan-National or Lambert-St Louis - Baltimore/Washington.

  • 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 Mesa Airlines (100%), Copa Airlines (92%) and United Airlines (85%).

  • 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 $748, our data shows the cheapest flight currently is $185. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $197 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, October is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $333). Flying from St. Louis to Washington, D.C. in February is currently the most expensive (average of $432). 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
Alexandria
Arlington
Woodbridge
Owings Mills
Lanham
Herndon
Tysons
Reston
Hyattsville
Rockville
Springfield
Fredericksburg
Falls Church
Laurel
Oxon Hill
Towson
Clinton
Hunt Valley
Waldorf
Silver Spring

Browse thousands of different options on Cheapflights for your next trip

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

AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$225FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$200Average$434FlexibilityNo cancel feeOn-time62%
DeltaCheapest$203Average$364FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$372FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$252Average$423FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$264Average$469FlexibilityNo cancel feeOn-time69%

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