Dulles Intl

$99+ Cheap flights from Missouri to Dulles Intl (IAD)

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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IAD
Aug 4 — Aug 111
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Cheap flight deals from Missouri to Dulles Intl

Keep the following information in mind while searching for Missouri to Dulles Intl flight deals. Data was last updated July 30, 2025.

Round-trip from

$198
(Frontier)

One-way from

$99
(Frontier)

Popular in

March

Cheapest in

August

Average price

$360

Good round-trip deal

$693 or less

Good one-way deal

$267 or less
From Missouri to Washington, D.C. Dulles Intl
One-way flight from Missouri to Washington, D.C. Dulles Intl
Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).
Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Missouri to Washington, D.C. Dulles Intl.
Price to beat on a one-way flight from Missouri to Washington, D.C. Dulles Intl.

Find flight deals from Missouri to Dulles Intl

Cheapest flights from Missouri to Dulles Intl
Explore the most affordable flight options available from Missouri to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This Frontier deal was found by Cheapflights users on 7/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/162:52 pmSTL - IAD
1 stop7h 34mFrontier
Sat 8/236:10 amIAD - STL
1 stop8h 23mFrontier
Deal found 7/28$198
This Frontier deal was found by Cheapflights users on 7/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1511:20 amMCI - IAD
1 stop11h 59mFrontier
Mon 8/186:10 amIAD - MCI
1 stop5h 11mFrontier
Deal found 7/28$216
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Wed 10/155:47 pmMCI - IAD
Nonstop2h 38mUnited Airlines
Sat 10/181:00 pmIAD - MCI
Nonstop2h 48mUnited Airlines
Deal found 7/30$217
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/115:20 pmSTL - IAD
1 stop4h 58mDelta
Tue 10/145:10 pmIAD - STL
1 stop4h 13mDelta
Deal found 7/28$237
This Delta deal was found by Cheapflights users on 7/30. 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.
Wed 8/205:50 amMCI - IAD
1 stop7h 41mDelta
Wed 9/312:13 pmIAD - MCI
1 stop7h 38mDelta
Deal found 7/30$237
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 9/27:04 pmSTL - IAD
1 stop4h 28mUnited Airlines
Thu 9/48:40 amIAD - STL
Nonstop2h 22mUnited Airlines
Deal found 7/30$244
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/212:24 pmSGF - IAD
1 stop7h 20mAmerican Airlines
Mon 8/254:36 pmIAD - SGF
1 stop5h 04mAmerican Airlines
Deal found 7/29$249
This Southwest deal was found by Cheapflights users on 7/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/86:20 amMCI - IAD
1 stop8h 25mSouthwest
Wed 9/105:45 amIAD - MCI
1 stop6h 00mSouthwest
Deal found 7/29$252
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:00 amMCI - IAD
1 stop8h 11mAmerican Airlines
Tue 11/116:04 amIAD - MCI
1 stop9h 02mAmerican Airlines
Deal found 7/29$267
This American Airlines deal was found by Cheapflights users on 7/30. 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 9/136:29 amSTL - IAD
1 stop6h 20mAmerican Airlines
Sat 9/207:17 pmIAD - STL
1 stop4h 50mAmerican Airlines
Deal found 7/30$271
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Fri 9/55:15 amMCI - IAD
2 stops9h 38mMultiple Airlines
Mon 9/810:49 amIAD - MCI
2 stops13h 18mMultiple Airlines
Deal found 7/30$274
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/128:05 amJLN - IAD
1 stop4h 44mUnited Airlines
Sat 8/165:13 pmIAD - JLN
1 stop7h 27mUnited Airlines
Deal found 7/28$284

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri to Dulles Intl 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 July 30, 2025.
Use the filters below to find and compare flights from Missouri to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Missouri

Fly to

Dulles Intl

Route

Depart

Return

Price

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 8/16

2:52 pm-11:26 pm

1 stop7h 34m

Washington, D.C. Dulles Intl

Sat 8/23

6:10 am-1:33 pm

1 stop8h 23m

$198

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Fri 8/15

11:20 am-12:19 am

1 stop11h 59m

Washington, D.C. Dulles Intl

Mon 8/18

6:10 am-10:21 am

1 stop5h 11m

$216

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Wed 10/15

5:47 pm-9:25 pm

Nonstop2h 38m

Washington, D.C. Dulles Intl

Sat 10/18

1:00 pm-2:48 pm

Nonstop2h 48m

$217

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 10/11

5:20 pm-11:18 pm

1 stop4h 58m

Washington, D.C. Dulles Intl

Tue 10/14

5:10 pm-8:23 pm

1 stop4h 13m

$237

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Wed 8/20

5:50 am-2:31 pm

1 stop7h 41m

Washington, D.C. Dulles Intl

Wed 9/3

12:13 pm-6:51 pm

1 stop7h 38m

$237

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 9/2

7:04 pm-12:32 am

1 stop4h 28m

Washington, D.C. Dulles Intl

Thu 9/4

8:40 am-10:02 am

Nonstop2h 22m

$244

SpringfieldWashington, D.C.

SGF - IAD

SGFIAD

Springfield-Branson

Thu 8/21

2:24 pm-10:44 pm

1 stop7h 20m

Washington, D.C. Dulles Intl

Mon 8/25

4:36 pm-8:40 pm

1 stop5h 04m

$249

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Mon 9/8

6:20 am-3:45 pm

1 stop8h 25m

Washington, D.C. Dulles Intl

Wed 9/10

5:45 am-10:45 am

1 stop6h 00m

$252

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Thu 8/21

2:57 pm-10:44 pm

1 stop6h 47m

Washington, D.C. Dulles Intl

Thu 8/28

6:34 am-10:17 am

1 stop4h 43m

$267

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 9/13

6:29 am-1:49 pm

1 stop6h 20m

Washington, D.C. Dulles Intl

Sat 9/20

7:17 pm-11:07 pm

1 stop4h 50m

$271

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 35 results
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Best time to book a flight from Missouri to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl 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. Dulles Intl Airport

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

Currently, July is the cheapest month in which you can book a flight from Missouri to Washington, D.C. Dulles Intl Airport (average of $306). Flying from Missouri to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 IAD?

Find hourly flight availability from Missouri to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Missouri to Washington, D.C. Dulles Intl Airport as you normally would.

Weekly flight availability from Missouri to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Missouri to Dulles Intl. 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 July 30, 2025.

The most flights from USMO to IAD are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (6 on average).

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

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated July 30, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Missouri to Washington, D.C. Dulles Intl Airport. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
8.0
Very good

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from Missouri to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What are the cheapest airlines to fly from Missouri to Washington, D.C. Dulles Intl Airport one-way?

    The cheapest airlines for a one-way flight from Missouri to Washington, D.C. Dulles Intl Airport are Frontier ($99), United Airlines ($109), and Delta ($119).

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

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Missouri to Washington, D.C. Dulles Intl Airport on time: Avianca (73%), Copa Airlines (73%), GoJet (72%).

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

    On average you can expect to pay $1,094 for a flight from Missouri to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $219 while the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl) is currently priced at $225.

  • Can I find deals for flights from Missouri to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Missouri to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Missouri to Dulles Intl.

  • Can I find deals for business class flights from Missouri to Dulles Intl?

    Yes. Cheapflights offers flight deals from Missouri to Dulles Intl 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. Dulles Intl Airport?

    Currently, July is the cheapest month in which you can book a flight from Missouri to Washington, D.C. Dulles Intl Airport (average of $306). Flying from Missouri to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Woodbridge
Arlington
Alexandria
Tysons
Silver Spring
Fredericksburg
Gaithersburg
Towson
Linthicum Heights
Easton
Fairfax
Manassas
Falls Church
Waldorf
Laurel
Rockville
Oxon Hill
National Harbor
Dundalk
Bowie

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Alternative routes for Missouri to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Missouri to Dulles Intl

Discover the top 3 airlines that operate flights from Missouri to Dulles Intl. 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$129Average$393FlexibilityNo cancel feeOn-time71%
DeltaCheapest$168Average$280FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$209Average$432FlexibilityNo cancel feeOn-time69%

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