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Washington, D.C.

$70+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — WAS
abr. 22 — abr. 291
mié. 4/22
mié. 4/29
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 marzo 23, 2026.

This Frontier deal was found by Cheapflights users on 3/23. 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.
mié. 4/158:23 pm
STL
-
BWI
1 stop10h 39m
Frontier
sáb. 4/185:45 pm
BWI
-
STL
1 stop6h 34m
Frontier
Deal found 3/23$140
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/158:23 pm
STL
-
BWI
1 stop10h 39m
Frontier
mar. 4/215:35 pm
BWI
-
STL
1 stop6h 44m
Frontier
Deal found 3/20$160
This Expedia deal was found by Cheapflights users on 3/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 4/104:31 pm
MCI
-
BWI
1 stop7h 13m
Frontier
lun. 4/135:35 am
BWI
-
MCI
1 stop11h 01m
Frontier
Deal found 3/21$160
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
lun. 5/48:23 pm
STL
-
BWI
1 stop10h 20m
Frontier
mié. 5/69:25 pm
BWI
-
STL
1 stop20h 29m
Frontier
Deal found 3/18$169
This Frontier deal was found by Cheapflights users on 3/19. 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.
jue. 4/26:29 pm
STL
-
BWI
1 stop5h 15m
Frontier
dom. 4/56:05 am
BWI
-
STL
1 stop5h 25m
Frontier
Deal found 3/19$180
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/96:29 pm
STL
-
BWI
1 stop5h 15m
Frontier
sáb. 4/115:42 pm
BWI
-
STL
1 stop6h 43m
Frontier
Deal found 3/20$181
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
jue. 4/1611:25 am
STL
-
BWI
1 stop12h 19m
Frontier
mar. 4/2112:17 pm
BWI
-
STL
1 stop19h 33m
Frontier
Deal found 3/18$196
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
jue. 4/212:24 pm
MCI
-
BWI
2 stops11h 20m
Multiple Airlines
lun. 4/65:35 am
BWI
-
MCI
1 stop11h 01m
Multiple Airlines
Deal found 3/18$201
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
vie. 4/178:23 pm
STL
-
BWI
1 stop13h 58m
Frontier
mar. 4/2112:17 pm
BWI
-
STL
1 stop19h 33m
Frontier
Deal found 3/18$202
This Kiwi.com deal was found by Cheapflights users on 3/21. 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.
vie. 4/248:23 pm
STL
-
BWI
1 stop13h 58m
Frontier
dom. 4/268:57 am
BWI
-
STL
1 stop22h 53m
Frontier
Deal found 3/21$203
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/26:29 pm
STL
-
BWI
1 stop5h 15m
Frontier
mar. 4/72:27 pm
BWI
-
STL
1 stop9h 58m
Frontier
Deal found 3/20$205
This Frontier deal was found by Cheapflights users on 3/22. 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.
vie. 4/2411:19 am
MCI
-
BWI
1 stop5h 08m
Frontier
dom. 4/266:05 am
BWI
-
MCI
1 stop5h 53m
Frontier
Deal found 3/22$205

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 marzo 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Frontier)

One-way from

$70
(Frontier)

Popular in

March

Cheapest in

August

Average price

$372

Good round-trip deal

$304 or less

Good one-way deal

$171 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. 12% potential increase in price ($44 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 marzo 23, 2026.
Use the filters below to find and compare flights from Missouri to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

jue. 5/14

7:40 pm-10:40 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

mar. 5/26

2:40 pm-4:00 pm

Nonstop2h 20m

$251

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

lun. 5/4

7:40 pm-10:40 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

mié. 5/6

11:40 am-6:00 pm

2 stops7h 20m

$266

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mié. 5/13

10:25 am-4:15 pm

1 stop4h 50m

Washington, D.C. Reagan-National

vie. 5/15

6:35 pm-11:55 pm

1 stop6h 20m

$274

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

lun. 4/27

5:59 pm-11:03 pm

1 stop4h 04m

Washington, D.C. Dulles Intl

jue. 4/30

6:00 am-9:42 am

1 stop4h 42m

$285

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

jue. 4/16

5:35 pm-9:00 pm

Nonstop2h 25m

Baltimore/Washington

mar. 4/21

7:40 pm-9:30 pm

Nonstop2h 50m

$290

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

sáb. 5/2

5:40 pm-9:14 pm

Nonstop2h 34m

Washington, D.C. Dulles Intl

lun. 5/4

5:15 pm-11:31 pm

1 stop7h 16m

$297

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

mar. 4/14

4:10 pm-7:35 pm

Nonstop2h 25m

Baltimore/Washington

jue. 4/16

11:05 am-4:00 pm

1 stop5h 55m

$300

Kansas CityBaltimore

MCI - BWI

MCIBWI

Kansas City

sáb. 5/16

6:00 am-1:35 pm

1 stop6h 35m

Baltimore/Washington

mié. 5/20

10:05 am-11:50 am

Nonstop2h 45m

$300

Kansas CityWashington, D.C.

MCI - DCA

MCIDCA

Kansas City

vie. 6/5

6:30 pm-9:55 pm

Nonstop2h 25m

Washington, D.C. Reagan-National

mar. 6/9

7:55 pm-11:25 pm

1 stop4h 30m

$301

Kansas CityWashington, D.C.

MCI - DCA

MCIDCA

Kansas City

lun. 4/20

6:35 pm-9:55 pm

Nonstop2h 20m

Washington, D.C. Reagan-National

lun. 4/27

5:00 pm-11:50 pm

2 stops7h 50m

$302

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $201). 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 marzo 23, 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 51% 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 March 23, 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 marzo 23, 2026.

The most flights from USMO to WAS are scheduled on a Monday (14 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (10 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, Southwest, and Delta fly from Missouri to Washington, D.C. in about 2h. The time it takes to get you to your destination can typically vary by up to 5h 13m. Airlines will cover a distance of 717 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 American Airlines ($67), Frontier ($72), 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, Kansas City - Washington, D.C. Dulles Intl or Lambert-St Louis - Baltimore/Washington as they are the most popular.

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

    Consider Avianca (72%), GoJet (71%) or United Airlines (71%) 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 $788, our data shows the cheapest flight currently is $171. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $221 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 $201). 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
Owings Mills
Arlington
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park
Cordova

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
Dallas/Fort Worth to Dulles Intl flights
Los Angeles to Dulles Intl flights
Boston to Dulles Intl flights
O'Hare Intl to Dulles Intl flights
O'Hare Intl to Reagan-National flights
San Francisco to Reagan-National flights
Seattle to Reagan-National flights
Atlanta to Dulles Intl flights
Seattle to Dulles Intl flights
San Francisco to Dulles Intl flights
Atlanta to Reagan-National flights
Boston to Reagan-National flights
Denver to Dulles Intl flights
Dallas/Fort Worth to Reagan-National flights
Orlando to Dulles Intl flights
Minneapolis to Dulles Intl flights
Hobby to Reagan-National flights
Hobby to Dulles Intl flights
Minneapolis to Reagan-National flights
Tampa to Dulles Intl flights
Orlando to Reagan-National flights
Detroit to Reagan-National flights
Miami to Reagan-National flights
George Bush Intcntl to Dulles Intl flights
Detroit to Dulles Intl flights
Denver to Reagan-National flights
Miami to Dulles Intl flights
LaGuardia to Reagan-National flights
George Bush Intcntl to Reagan-National flights
Sky Harbor Intl to Dulles Intl flights
Tampa to Reagan-National flights
Austin to Dulles Intl flights
San Diego to Dulles Intl flights
Fort Lauderdale to Dulles Intl flights
San Diego to Reagan-National flights
John F Kennedy Intl to Dulles Intl flights
Fort Lauderdale to Reagan-National flights
Ontario to Dulles Intl flights
Midway to Dulles Intl flights
Austin to Reagan-National flights
Sky Harbor Intl to Reagan-National flights
Ontario to Reagan-National flights
Portland to Dulles Intl flights
Providence to Dulles Intl flights
John F Kennedy Intl to Reagan-National flights
Newark to Dulles Intl flights
Salt Lake City to Dulles Intl flights
Nashville to Dulles Intl flights
Sacramento to Dulles Intl 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 marzo 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$80Average$201FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$96Average$263FlexibilityNo cancel feeOn-time65%
DeltaCheapest$99Average$351FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$150Average$412FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$163Average$436FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$197Average$371FlexibilityNo cancel feeOn-time63%

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