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Washington, D.C.

$54+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — WAS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/243:49 pm
STL
-
BWI
1 stop26h 41m
Frontier
Fri 2/276:08 pm
BWI
-
STL
1 stop13h 43m
Frontier
Deal found 1/28$134
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:17 pm
STL
-
BWI
1 stop19h 56m
Multiple Airlines
Wed 3/411:30 am
BWI
-
STL
1 stop11h 57m
Multiple Airlines
Deal found 1/28$135
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
-
BWI
1 stop25h 49m
Frontier
Mon 3/95:31 am
BWI
-
STL
1 stop8h 48m
Frontier
Deal found 1/29$136
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1811:32 am
STL
-
BWI
1 stop12h 09m
Frontier
Mon 3/233:19 pm
BWI
-
STL
1 stop20h 13m
Frontier
Deal found 1/27$144
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2711:00 am
MCI
-
BWI
1 stop12h 31m
Frontier
Sun 3/16:00 am
BWI
-
MCI
1 stop28h 53m
Frontier
Deal found 1/28$152
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/65:08 pm
MCI
-
BWI
1 stop21h 50m
Frontier
Mon 3/95:31 am
BWI
-
MCI
1 stop11h 52m
Frontier
Deal found 1/27$157
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:20 pm
MCI
-
BWI
1 stop19h 04m
Multiple Airlines
Tue 3/244:05 pm
BWI
-
MCI
1 stop19h 18m
Multiple Airlines
Deal found 1/27$159
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2012:16 pm
STL
-
BWI
1 stop11h 25m
Frontier
Mon 3/233:19 pm
BWI
-
STL
1 stop20h 13m
Frontier
Deal found 1/27$161
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1711:26 am
MCI
-
BWI
1 stop11h 33m
Spirit Airlines
Tue 3/244:05 pm
BWI
-
MCI
1 stop19h 18m
Spirit Airlines
Deal found 1/27$163
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2011:00 am
MCI
-
BWI
1 stop12h 31m
Frontier
Sun 2/226:00 am
BWI
-
MCI
1 stop28h 53m
Frontier
Deal found 1/27$171
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Wed 2/254:24 pm
MCI
-
BWI
1 stop17h 53m
Spirit Airlines
Wed 3/46:20 am
BWI
-
MCI
1 stop29h 10m
Spirit Airlines
Deal found 1/27$174
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
-
BWI
1 stop25h 49m
Frontier
Mon 3/163:19 pm
BWI
-
STL
2 stops33h 00m
Frontier
Deal found 1/27$177

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$134
(Kiwi.com)

One-way from

$54
(Trip.com)

Popular in

January

Cheapest in

August

Average price

$382

Good round-trip deal

$300 or less

Good one-way deal

$139 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. 11% potential increase in price ($39 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 January 2026
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 January 29, 2026.
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

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 3/16

8:10 pm-3:28 pm

1 stop18h 18m

Baltimore/Washington

Fri 3/20

5:31 am-1:34 pm

1 stop9h 03m

$177

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Tue 3/17

4:51 pm-11:59 pm

1 stop6h 08m

Baltimore/Washington

Mon 3/23

3:19 pm-10:32 am

1 stop20h 13m

$178

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 3/6

1:09 pm-12:31 am

1 stop10h 22m

Baltimore/Washington

Mon 3/9

9:43 pm-9:49 am

2 stops37h 06m

$179

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 3/9

2:09 pm-12:43 am

1 stop9h 34m

Baltimore/Washington

Thu 3/12

6:05 am-7:22 am

2 stops26h 17m

$183

Kansas CityWashington, D.C.

MCI - DCA

MCIDCA

Kansas City

Wed 2/18

4:39 pm-9:59 pm

1 stop28h 20m

Washington, D.C. Reagan-National

Wed 2/25

2:00 pm-5:59 pm

2 stops28h 59m

$255

ColumbiaWashington, D.C.

COU - IAD

COUIAD

Columbia Regional

Thu 5/28

11:23 am-6:56 pm

1 stop6h 33m

Washington, D.C. Dulles Intl

Sat 6/6

6:15 am-10:48 am

1 stop5h 33m

$258

ColumbiaWashington, D.C.

COU - IAD

COUIAD

Columbia Regional

Sat 3/7

2:41 pm-8:37 pm

1 stop4h 56m

Washington, D.C. Dulles Intl

Sun 3/8

6:15 am-10:33 am

1 stop5h 18m

$258

ColumbiaWashington, D.C.

COU - IAD

COUIAD

Columbia Regional

Fri 3/6

11:15 am-5:30 pm

1 stop5h 15m

Washington, D.C. Dulles Intl

Sun 3/8

6:15 am-10:33 am

1 stop5h 18m

$258

ColumbiaWashington, D.C.

COU - IAD

COUIAD

Columbia Regional

Thu 2/19

11:15 am-5:30 pm

1 stop5h 15m

Washington, D.C. Dulles Intl

Tue 3/10

8:32 am-2:06 pm

1 stop6h 34m

$258

ColumbiaWashington, D.C.

COU - IAD

COUIAD

Columbia Regional

Sat 3/7

2:41 pm-8:37 pm

1 stop4h 56m

Washington, D.C. Dulles Intl

Tue 3/10

8:32 am-2:06 pm

1 stop6h 34m

$258

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

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 January 29, 2026.

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 54% 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 January 24, 2026.

Travelers seeking maximum savings on their Missouri to Washington, D.C. flight should consider departing on Sunday 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.

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 January 29, 2026.

The most flights from USMO to WAS are scheduled on a Monday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 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, United Airlines, and American Airlines fly from Missouri to Washington, D.C. in about 4h 54m. The time it takes to get you to your destination can typically vary by up to 13h 24m. Airlines will cover a distance of 895 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 ($63), American Airlines ($69), and Southwest ($89).

  • 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 Lambert-St Louis - Washington, D.C. Reagan-National as they are the most popular.

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

    Consider Avianca (79%), Copa Airlines (79%) or GoJet (68%) 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 $618, our data shows the cheapest flight currently is $180. 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 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
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Manassas
Largo
Bowie
McLean
Clinton
Upper Marlboro

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.
Los Angeles to Reagan-National flights
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Raleigh to Reagan-National flights

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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$204FlexibilityNo cancel feeOn-time62%
DeltaCheapest$99Average$337FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$107Average$237FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$149Average$386FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$163Average$433FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$189Average$363FlexibilityNo cancel feeOn-time63%

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