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Washington, D.C.

$41+ Cheap flights from Missouri 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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — WAS
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
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Find flight deals from Missouri to Washington, D.C.

Cheapest flights from Missouri to Washington, D.C.
Explore the most affordable flight options available from Missouri to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.

This Frontier deal was found by Cheapflights users on 11/5. 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.
Thu 12/412:04 pmSTL - BWI
1 stop11h 20mFrontier
Thu 12/115:55 amBWI - STL
1 stop6h 12mFrontier
Deal found 11/5$110
This Booking.com deal was found by Cheapflights users on 11/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:30 pmSTL - BWI
1 stop15h 12mFrontier
Wed 12/1011:16 amBWI - STL
1 stop12h 17mFrontier
Deal found 11/3$111
This Priceline deal was found by Cheapflights users on 11/5. 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.
Fri 12/59:54 amSTL - BWI
1 stop9h 22mFrontier
Mon 12/85:40 amBWI - STL
1 stop5h 12mFrontier
Deal found 11/5$124
This Frontier deal was found by Cheapflights users on 11/6. 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.
Fri 12/512:13 pmMCI - BWI
1 stop11h 19mFrontier
Mon 12/85:40 amBWI - MCI
1 stop7h 11mFrontier
Deal found 11/6$124
This Mytrip deal was found by Cheapflights users on 11/4. 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.
Wed 11/197:24 pmSTL - BWI
1 stop18h 56mFrontier
Sun 11/234:25 pmBWI - STL
1 stop8h 32mFrontier
Deal found 11/4$127
This Booking.com deal was found by Cheapflights users on 11/4. 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 11/197:24 pmSTL - BWI
1 stop18h 56mFrontier
Mon 11/248:45 pmBWI - STL
1 stop28h 12mFrontier
Deal found 11/4$128
This Flightnetwork deal was found by Cheapflights users on 11/4. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/197:24 pmSTL - BWI
1 stop18h 56mFrontier
Mon 12/18:45 pmBWI - STL
1 stop26h 48mFrontier
Deal found 11/4$136
This Booking.com deal was found by Cheapflights users on 11/5. 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 11/197:24 pmSTL - BWI
1 stop18h 56mFrontier
Sat 11/228:45 pmBWI - STL
1 stop28h 12mFrontier
Deal found 11/5$138
This Booking.com deal was found by Cheapflights users on 11/4. 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.
Fri 12/123:30 pmSTL - BWI
1 stop15h 12mFrontier
Sun 12/148:13 amBWI - STL
1 stop25h 46mFrontier
Deal found 11/4$139
This Booking.com deal was found by Cheapflights users on 11/4. 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.
Sat 12/63:30 pmSTL - BWI
1 stop14h 48mFrontier
Mon 12/88:37 amBWI - STL
1 stop14h 56mFrontier
Deal found 11/4$140
This Booking.com deal was found by Cheapflights users on 11/4. 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.
Fri 11/214:13 pmSTL - BWI
1 stop22h 07mFrontier
Tue 11/259:45 pmBWI - STL
1 stop12h 44mFrontier
Deal found 11/4$142
This Booking.com deal was found by Cheapflights users on 11/4. 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.
Fri 11/214:13 pmSTL - BWI
1 stop26h 37mFrontier
Mon 11/244:25 pmBWI - STL
1 stop8h 32mFrontier
Deal found 11/4$145

Cheap flight deals from Missouri to Washington, D.C.

Keep the following information in mind while searching for Missouri to Washington, D.C. flight deals. Data was last updated November 6, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$110
(Frontier)

One-way from

$41
(Trip.com)

Popular in

March

Cheapest in

August

Average price

$247

Good round-trip deal

$313 or less

Good one-way deal

$165 or less
Provider with most accurate pricing for Lambert-St Louis-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Washington, D.C. (WAS) flights.
Search Deals
From Missouri to Washington, D.C. (WAS)
Search Deals
One-way flight from Missouri to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Missouri to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way flight from Missouri to Washington, D.C. (WAS).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri 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 November 6, 2025.
Use the filters below to find and compare flights from Missouri to Washington, D.C. that are best for you.

Fly from

Missouri

Fly to

Washington, D.C.

Route

Depart

Return

Price

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

Wed 12/24

11:33 am-12:29 am

1 stop11h 56m

Baltimore/Washington

Tue 12/30

11:55 am-10:08 am

1 stop23h 13m

$154

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 11/24

7:04 pm-5:36 pm

1 stop21h 32m

Baltimore/Washington

Tue 12/2

7:30 am-10:33 pm

1 stop16h 03m

$175

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 11/19

7:45 pm-8:51 pm

2 stops24h 06m

Baltimore/Washington

Mon 11/24

4:25 pm-11:57 pm

1 stop8h 32m

$201

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sun 12/7

10:42 am-12:24 am

1 stop12h 42m

Baltimore/Washington

Tue 12/9

8:00 am-10:33 pm

2 stops15h 33m

$212

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 11/14

4:56 pm-12:13 am

1 stop6h 17m

Baltimore/Washington

Mon 12/1

8:45 pm-10:33 pm

1 stop26h 48m

$216

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

Fri 12/5

2:48 pm-7:42 am

2 stops15h 54m

Baltimore/Washington

Mon 12/8

5:40 am-11:51 am

1 stop7h 11m

$217

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

Fri 12/12

3:47 pm-7:42 am

1 stop14h 55m

Baltimore/Washington

Sun 12/14

7:52 pm-11:51 am

2 stops16h 59m

$223

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

Sat 11/22

6:00 am-5:24 pm

1 stop10h 24m

Baltimore/Washington

Mon 11/24

5:40 am-6:36 pm

1 stop13h 56m

$225

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 12/9

8:30 am-11:40 am

Nonstop2h 10m

Washington, D.C. Dulles Intl

Mon 12/15

5:19 pm-11:42 pm

1 stop7h 23m

$227

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sun 12/14

7:05 am-12:46 pm

1 stop4h 41m

Baltimore/Washington

Sat 1/17

11:29 am-2:49 pm

1 stop4h 20m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 60 results
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Best time to book a flight from Missouri to Washington, D.C.

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

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

Currently, December is the cheapest month in which you can book a flight from Missouri to Washington, D.C. (average of $98). Flying from Missouri to Washington, D.C. in June is currently the most expensive (average of $198). 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 MO to WAS?

Find hourly flight availability from Missouri 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 November 6, 2025.

When flying from Missouri to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 48% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Missouri to Washington, D.C.. Price data was last updated on December 16, 2024.

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

Weekly flight availability from Missouri to Washington, D.C.

Explore weekly flight availability from Missouri 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 November 6, 2025.

The most flights from USMO 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 (7 on average).

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

Related info for your journey

Find useful and relevant information for your journey from Missouri 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.

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

    Airlines like Frontier, Spirit Airlines, and United Airlines fly from Missouri to Washington, D.C. in about 2h 10m. The time it takes to get you to your destination can typically vary by up to 9h 46m. Airlines will cover a distance of 694 mi. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from Missouri to Washington, D.C. are Frontier ($55), Spirit Airlines ($93), and Southwest ($109).

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

    When deciding which route to take from Missouri to Washington, D.C. consider Lambert-St Louis - Washington, D.C. Dulles Intl, Lambert-St Louis - Baltimore/Washington or Kansas City - Washington, D.C. Dulles Intl as they are the most popular.

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

    Consider Copa Airlines (83%), Avianca (81%) or GoJet (80%) when booking your flight. These represent the most reliable airlines when flying from Missouri to Washington, D.C..

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

    While on average a flight from Missouri to Washington, D.C. is generally $499, our data shows the cheapest flight currently is $145. 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 Missouri to Washington, D.C. that include hotel bookings?

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

  • How can I find direct flights from Missouri 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 Missouri to Washington, D.C..

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

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

    Currently, December is the cheapest month in which you can book a flight from Missouri to Washington, D.C. (average of $98). Flying from Missouri to Washington, D.C. in June is currently the most expensive (average of $198). 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
Tysons
Woodbridge
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fairfax
Fredericksburg
Falls Church
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Waldorf
Bowie
Largo
McLean

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Missouri to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Missouri to Washington, D.C.

Discover the top 6 airlines that operate flights from Missouri 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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$197FlexibilityNo cancel feeOn-time62%
DeltaCheapest$124Average$329FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$135Average$309FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$149Average$387FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$362FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$238Average$434FlexibilityNo cancel feeOn-time69%

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