Dulles Intl

$79+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IAD
Jun 17 — Jun 241
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Missouri to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 12, 2025.

Round-trip from

$208
(Delta)

One-way from

$79
(United Airlines)

Popular in

March

Cheapest in

November

Average price

$365

Good round-trip deal

$602 or less

Good one-way deal

$219 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. 1% potential price decrease ($4 potential savings vs. average RT price).
Average for round-trip flights in June 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 June 12, 2025.

This Delta deal was found by Cheapflights users on 6/10. 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 11/57:20 amSTL - IAD
1 stop5h 37mDelta
Sat 11/86:10 amIAD - STL
1 stop4h 25mDelta
Deal found 6/10$208
This United Airlines deal was found by Cheapflights users on 6/12. 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 9/249:17 amSTL - IAD
1 stop5h 35mUnited Airlines
Fri 9/266:30 amIAD - STL
1 stop5h 19mUnited Airlines
Deal found 6/12$213
This Frontier deal was found by Cheapflights users on 6/11. 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 7/122:52 pmSTL - IAD
1 stop7h 27mFrontier
Sat 7/196:10 amIAD - STL
1 stop8h 49mFrontier
Deal found 6/11$226
This Delta deal was found by Cheapflights users on 6/10. 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.
Tue 8/55:45 amMCI - IAD
1 stop5h 05mDelta
Sat 8/96:00 amIAD - MCI
1 stop4h 43mDelta
Deal found 6/10$234
This United Airlines deal was found by Cheapflights users on 6/10. 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 9/27:30 amMCI - IAD
1 stop7h 22mUnited Airlines
Thu 9/41:00 pmIAD - MCI
Nonstop2h 48mUnited Airlines
Deal found 6/10$237
This Delta deal was found by Cheapflights users on 6/11. 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 7/93:57 pmSGF - IAD
1 stop6h 19mDelta
Wed 7/1612:45 pmIAD - SGF
1 stop6h 26mDelta
Deal found 6/11$249
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Mon 9/16:33 pmMCI - IAD
1 stop4h 19mAmerican Airlines
Wed 9/311:18 amIAD - MCI
2 stops12h 49mAmerican Airlines
Deal found 6/11$256
This Southwest deal was found by Cheapflights users on 6/10. 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.
Sun 8/177:20 amSTL - IAD
1 stop7h 00mSouthwest
Wed 8/205:45 amIAD - STL
1 stop6h 45mSouthwest
Deal found 6/10$257
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Sun 8/175:27 amSTL - IAD
1 stop6h 21mAmerican Airlines
Wed 8/204:36 pmIAD - STL
1 stop7h 29mAmerican Airlines
Deal found 6/11$271
This Southwest deal was found by Cheapflights users on 6/11. 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.
Thu 7/316:50 amMCI - IAD
1 stop9h 05mSouthwest
Mon 8/186:50 pmIAD - MCI
1 stop6h 15mSouthwest
Deal found 6/11$273
This Mytrip deal was found by Cheapflights users on 6/10. 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.
Sun 8/178:37 amSGF - IAD
2 stops28h 46mAllegiant Air
Thu 8/217:10 pmIAD - SGF
1 stop15h 41mAllegiant Air
Deal found 6/10$276
This Mytrip deal was found by Cheapflights users on 6/11. 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 7/26:05 amMCI - IAD
2 stops28h 03mMultiple Airlines
Sun 7/611:58 amIAD - MCI
1 stop23h 02mMultiple Airlines
Deal found 6/11$291

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 June 12, 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

Wed 11/5

7:20 am-1:57 pm

1 stop5h 37m

Washington, D.C. Dulles Intl

Sat 11/8

6:10 am-9:35 am

1 stop4h 25m

$208

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Wed 9/24

9:17 am-3:52 pm

1 stop5h 35m

Washington, D.C. Dulles Intl

Fri 9/26

6:30 am-10:49 am

1 stop5h 19m

$213

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 7/12

2:52 pm-11:19 pm

1 stop7h 27m

Washington, D.C. Dulles Intl

Sat 7/19

6:10 am-1:59 pm

1 stop8h 49m

$226

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Tue 8/5

5:45 am-11:50 am

1 stop5h 05m

Washington, D.C. Dulles Intl

Sat 8/9

6:00 am-9:43 am

1 stop4h 43m

$234

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Tue 9/2

7:30 am-3:52 pm

1 stop7h 22m

Washington, D.C. Dulles Intl

Thu 9/4

1:00 pm-2:48 pm

Nonstop2h 48m

$237

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Fri 8/22

3:20 pm-10:50 pm

1 stop6h 30m

Washington, D.C. Dulles Intl

Mon 8/25

6:50 pm-12:05 am

1 stop6h 15m

$248

SpringfieldWashington, D.C.

SGF - IAD

SGFIAD

Springfield-Branson

Wed 7/9

3:57 pm-11:16 pm

1 stop6h 19m

Washington, D.C. Dulles Intl

Wed 7/16

12:45 pm-6:11 pm

1 stop6h 26m

$249

Kansas CityWashington, D.C.

MCI - IAD

MCIIAD

Kansas City

Mon 9/1

6:33 pm-11:52 pm

1 stop4h 19m

Washington, D.C. Dulles Intl

Wed 9/3

11:18 am-11:07 pm

2 stops12h 49m

$256

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sun 8/17

7:20 am-3:20 pm

1 stop7h 00m

Washington, D.C. Dulles Intl

Wed 8/20

5:45 am-11:30 am

1 stop6h 45m

$257

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sun 8/17

5:27 am-12:48 pm

1 stop6h 21m

Washington, D.C. Dulles Intl

Wed 8/20

4:36 pm-11:05 pm

1 stop7h 29m

$271

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 39 results
1
2
3
4

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, August is the cheapest month in which you can book a flight from Missouri to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Missouri to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $349). 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 June 12, 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 June 12, 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).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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 June 12, 2025.
Get a feel of what it's like to fly with Southwest, Delta and United Airlines from Missouri to Washington, D.C. by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.2

Comfort

8.0

Food

7.1

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Boarding

8.2

Comfort

8.0

Food

7.1

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
8.0
Very good

Boarding

8.2

Comfort

8.0

Food

7.1

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Boarding

8.2

Comfort

8.0

Food

7.1

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Boarding

8.2

Comfort

8.0

Food

7.1

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Boarding

8.2

Comfort

8.0

Food

7.1

Overall

8.0

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 United Airlines ($79), Southwest ($89), and Delta ($109).

  • 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 (90%), Copa Airlines (90%), GoJet (81%).

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

    On average you can expect to pay $1,880 for a flight from Missouri to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $149 while the most popular route, (Kansas City - Washington, D.C. Dulles Intl) is currently priced at $187.

  • 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, August is the cheapest month in which you can book a flight from Missouri to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Missouri to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $349). 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 Missouri?

Book flights to Missouri if you plan to visit one of these locations
Arlington
Alexandria
Woodbridge
Tysons
Silver Spring
Linthicum Heights
Fredericksburg
Gaithersburg
Fairfax
Falls Church
Easton
Herndon
Towson
Sterling
Bowie
Rockville
Reston
National Harbor
Springfield
Manassas

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$129Average$386FlexibilityNo cancel feeOn-time71%
DeltaCheapest$191Average$276FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$209Average$430FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.