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Dulles Intl

$144+ Cheap flights from Washington 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 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Washington to Dulles Intl

Keep the following information in mind while searching for Washington to Dulles Intl flight deals. Data was last updated September 16, 2025.

Round-trip from

$257
(Alaska Airlines)

One-way from

$144
(KAYAK)

Popular in

December

Cheapest in

August

Average price

$417

Good round-trip deal

$297 or less

Good one-way deal

$186 or less
From Washington to Washington, D.C. Dulles Intl
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One-way flight from Washington to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 9% potential increase in price ($44 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Washington to Washington, D.C. Dulles Intl.
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Find flight deals from Washington to Dulles Intl

Cheapest flights from Washington to Dulles Intl
Explore the most affordable flight options available from Washington to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Delta deal was found by Cheapflights users on 9/15. 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.
Fri 10/104:48 pmSEA - IAD
Nonstop4h 52mDelta
Sun 11/97:15 amIAD - SEA
Nonstop6h 04mDelta
Deal found 9/15$257
This Expedia deal was found by Cheapflights users on 9/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/114:48 pmSEA - IAD
Nonstop4h 52mDelta
Sat 10/187:35 amIAD - SEA
Nonstop5h 53mDelta
Deal found 9/12$258
This CheapOair deal was found by Cheapflights users on 9/15. 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.
Sat 11/112:58 pmSEA - IAD
2 stops33h 13mFrontier
Mon 11/36:18 pmIAD - SEA
2 stops44h 55mFrontier
Deal found 9/15$265
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/128:00 amSEA - IAD
Nonstop5h 07mUnited Airlines
Wed 11/192:25 pmIAD - SEA
1 stop9h 48mUnited Airlines
Deal found 9/15$267
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Fri 10/315:20 pmSEA - IAD
1 stop9h 07mUnited Airlines
Sat 11/16:30 amIAD - SEA
1 stop8h 15mUnited Airlines
Deal found 9/14$271
This CheapOair deal was found by Cheapflights users on 9/13. 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.
Fri 10/36:12 amSEA - IAD
2 stops14h 27mFrontier
Sat 10/117:15 amIAD - SEA
2 stops52h 33mFrontier
Deal found 9/13$273
This Frontier deal was found by Cheapflights users on 9/13. 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.
Wed 9/247:00 amSEA - IAD
2 stops23h 17mFrontier
Mon 9/291:55 pmIAD - SEA
2 stops13h 35mFrontier
Deal found 9/13$274
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/307:13 pmSEA - IAD
1 stop7h 03mUnited Airlines
Sun 11/25:30 amIAD - SEA
1 stop10h 08mUnited Airlines
Deal found 9/15$277
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Fri 10/178:43 pmSEA - IAD
2 stops23h 46mFrontier
Mon 10/206:15 amIAD - SEA
2 stops32h 52mFrontier
Deal found 9/14$280
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Fri 11/72:22 pmSEA - IAD
2 stops30h 33mFrontier
Mon 11/106:00 amIAD - SEA
2 stops33h 13mFrontier
Deal found 9/14$282
This CheapOair deal was found by Cheapflights users on 9/13. 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.
Mon 10/1310:16 amSEA - IAD
2 stops30h 30mFrontier
Mon 10/206:15 amIAD - SEA
2 stops32h 52mFrontier
Deal found 9/13$283
This United Airlines deal was found by Cheapflights users on 9/15. 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 10/157:02 amPDX - IAD
1 stop9h 01mUnited Airlines
Wed 10/225:45 pmIAD - PDX
Nonstop5h 35mUnited Airlines
Deal found 9/15$283

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 September 16, 2025.
Use the filters below to find and compare flights from Washington to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Washington

Fly to

Dulles Intl

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 11/5

4:48 pm-12:40 am

Nonstop4h 52m

Washington, D.C. Dulles Intl

Wed 11/12

7:15 am-10:19 am

Nonstop6h 04m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 1/5

10:14 pm-6:13 am

Nonstop4h 59m

Washington, D.C. Dulles Intl

Sat 1/24

6:55 pm-9:40 pm

Nonstop5h 45m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 11/6

4:48 pm-12:40 am

Nonstop4h 52m

Washington, D.C. Dulles Intl

Wed 11/12

7:15 am-10:19 am

Nonstop6h 04m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 11/8

10:29 pm-6:23 am

Nonstop4h 54m

Washington, D.C. Dulles Intl

Mon 11/10

7:43 am-10:35 am

Nonstop5h 52m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 10/14

4:48 pm-12:40 am

Nonstop4h 52m

Washington, D.C. Dulles Intl

Tue 10/21

7:35 am-10:28 am

Nonstop5h 53m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 1/7

9:55 am-5:55 pm

Nonstop5h 00m

Washington, D.C. Dulles Intl

Tue 1/20

6:55 pm-9:40 pm

Nonstop5h 45m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 10/23

4:48 pm-12:40 am

Nonstop4h 52m

Washington, D.C. Dulles Intl

Sun 11/9

7:15 am-10:19 am

Nonstop6h 04m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 1/6

10:14 pm-6:13 am

Nonstop4h 59m

Washington, D.C. Dulles Intl

Sun 1/18

6:55 pm-9:40 pm

Nonstop5h 45m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 11/7

4:48 pm-12:40 am

Nonstop4h 52m

Washington, D.C. Dulles Intl

Wed 11/12

7:15 am-10:19 am

Nonstop6h 04m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 1/10

9:55 am-5:55 pm

Nonstop5h 00m

Washington, D.C. Dulles Intl

Sun 1/18

6:55 pm-9:40 pm

Nonstop5h 45m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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Best time to book a flight from Washington to Dulles Intl

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

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

Currently, August is the cheapest month in which you can book a flight from State of Washington to Washington, D.C. Dulles Intl Airport (average of $292). Flying from State of Washington 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 WA to IAD?

Find hourly flight availability from Washington 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 September 16, 2025.

When flying from State of Washington to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Explore weekly flight availability from Washington 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 September 16, 2025.

The most flights from USWA to IAD are scheduled on a Thursday (26 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (14 on average).

Related info for your journey

Find useful and relevant information for your journey from Washington to Dulles Intl. 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 State of Washington to Washington, D.C. Dulles Intl Airport?

    Departing from State of Washington to Washington, D.C. Dulles Intl Airport will take you 4h 52m. Airlines will cover a distance of 2299 mi. All flights are typically nonstop.

  • What are the cheapest airlines to fly from State of Washington to Washington, D.C. Dulles Intl Airport one-way?

    One-way options have recently been found by users for as low as $158 on Hawaiian Airlines. Other airlines that offer cheap prices include American Airlines from $159 and United Airlines from $159 one-way.

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

    Most travelers choose Seattle/Tacoma Intl - Washington, D.C. Dulles Intl, Portland - Washington, D.C. Dulles Intl or Spokane - Washington, D.C. Dulles Intl when deciding on the best route from State of Washington to Washington, D.C. Dulles Intl Airport.

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

    Before booking your flight to Washington, D.C. Dulles Intl Airport from State of Washington, check out the most reliable airlines to get you to your destination on time: Austrian Airlines (87%), Brussels Airlines (87%), Lufthansa( 83%).

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

    While on average a flight from State of Washington to Washington, D.C. Dulles Intl Airport is generally $844, our data shows the cheapest flight currently is $152. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $241 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from State of Washington to Washington, D.C. Dulles Intl Airport (average of $292). Flying from State of Washington 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
Springfield
Gaithersburg
Fredericksburg
Linthicum Heights
Fairfax
Falls Church
Owings Mills
Manassas
Rockville
Hanover
Oxon Hill
Laurel
Towson
National Harbor
Dundalk

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Dulles Intl flights
Boston to Baltimore flights
Dallas/Fort Worth to Baltimore flights
Los Angeles to Reagan-National flights
Dallas/Fort Worth to Reagan-National flights
Boston to Reagan-National flights
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Seattle to Dulles Intl flights
O'Hare Intl to Reagan-National flights
O'Hare Intl to Baltimore flights
Seattle to Reagan-National flights
San Francisco to Reagan-National flights
O'Hare Intl to Dulles Intl flights
Boston to Dulles Intl flights
San Francisco to Baltimore flights
Los Angeles to Baltimore flights
Seattle to Baltimore flights
San Francisco to Dulles Intl flights
Hobby to Reagan-National flights
Atlanta to Dulles Intl flights
Minneapolis to Dulles Intl flights
Hobby to Baltimore flights
Austin to Dulles Intl flights
Atlanta to Reagan-National flights
Detroit to Dulles Intl flights
Midway to Baltimore flights
Atlanta to Baltimore flights
Minneapolis to Reagan-National flights
John F Kennedy Intl to Dulles Intl flights
Detroit to Reagan-National flights
Charlotte to Dulles Intl flights
San Diego to Dulles Intl flights
Hobby to Dulles Intl flights
Orlando to Dulles Intl flights
Tampa to Dulles Intl flights
Midway to Dulles Intl flights
Miami to Reagan-National flights
Fort Lauderdale to Baltimore flights
George Bush Intcntl to Dulles Intl flights
Orlando to Reagan-National flights
Austin to Baltimore flights
Orlando to Baltimore flights
George Bush Intcntl to Reagan-National flights
Tampa to Reagan-National flights
Salt Lake City to Reagan-National flights
San Diego to Reagan-National flights
Austin to Reagan-National flights
Burbank to Baltimore flights
Denver to Baltimore flights
George Bush Intcntl to Baltimore flights

Top 6 airlines flying from Washington to Dulles Intl

Discover the top 6 airlines that operate flights from Washington 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$143Average$332FlexibilityNo cancel feeOn-time85%
DeltaCheapest$149Average$416FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$188Average$217FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$256Average$486FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$261Average$452FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$268Average$457FlexibilityNo cancel feeOn-time75%

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