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Dulles Intl

$127+ 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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/3111:15 pmSEA - IAD
Nonstop4h 56mUnited Airlines
Thu 1/85:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/10$318
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/315:02 amSEA - IAD
1 stop8h 37mUnited Airlines
Wed 1/75:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/10$328
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/315:02 amSEA - IAD
1 stop8h 37mUnited Airlines
Fri 1/95:17 pmIAD - SEA
1 stop8h 26mUnited Airlines
Deal found 12/10$333
This Delta deal was found by Cheapflights users on 12/10. 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 12/313:55 pmSEA - IAD
2 stops14h 54mDelta
Wed 1/77:30 amIAD - SEA
Nonstop5h 59mDelta
Deal found 12/10$351
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Thu 12/2511:15 pmSEA - IAD
Nonstop4h 56mUnited Airlines
Thu 1/85:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/10$373
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/3111:15 pmSEA - IAD
Nonstop4h 56mUnited Airlines
Mon 1/55:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/10$382
This United Airlines deal was found by Cheapflights users on 12/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:06 amSEA - IAD
1 stop9h 09mUnited Airlines
Wed 1/75:55 pmIAD - SEA
Nonstop6h 02mUnited Airlines
Deal found 12/11$383
This Delta deal was found by Cheapflights users on 12/10. 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 12/313:55 pmSEA - IAD
2 stops14h 54mDelta
Tue 1/67:30 amIAD - SEA
Nonstop5h 59mDelta
Deal found 12/10$391
This Delta deal was found by Cheapflights users on 12/10. 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.
Mon 12/293:30 pmSEA - IAD
Nonstop4h 57mDelta
Wed 1/77:30 amIAD - SEA
Nonstop5h 59mDelta
Deal found 12/10$392
This United Airlines deal was found by Cheapflights users on 12/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2911:55 pmPDX - IAD
1 stop8h 50mUnited Airlines
Tue 1/66:20 amIAD - PDX
1 stop10h 25mUnited Airlines
Deal found 12/11$437
This Southwest deal was found by Cheapflights users on 12/10. 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.
Mon 12/299:00 pmPDX - IAD
1 stop13h 05mSouthwest
Tue 1/64:30 pmIAD - PDX
1 stop9h 00mSouthwest
Deal found 12/10$442
This American Airlines deal was found by Cheapflights users on 12/11. 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 12/2910:21 pmPDX - IAD
1 stop7h 21mAmerican Airlines
Thu 1/81:08 pmIAD - PDX
1 stop10h 16mAmerican Airlines
Deal found 12/11$457

Find 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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$216
(United Airlines)

One-way from

$127
(Kiwi.com)

Popular in

January

Cheapest in

August

Average price

$457

Good round-trip deal

$337 or less

Good one-way deal

$221 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Washington, D.C. (WAS) flights.
Search Deals
From Washington to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Washington to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($53 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Washington to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Washington to Washington, D.C. Dulles Intl.
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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 December 12, 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

Fri 1/23

11:10 pm-11:49 am

1 stop9h 39m

Washington, D.C. Dulles Intl

Sun 1/25

6:00 am-10:42 am

1 stop7h 42m

$219

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 2/19

9:27 am-5:20 pm

Nonstop4h 53m

Washington, D.C. Dulles Intl

Sun 2/22

7:05 am-10:05 am

Nonstop6h 00m

$238

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 1/8

5:00 am-4:35 pm

1 stop8h 35m

Washington, D.C. Dulles Intl

Thu 1/15

5:17 pm-10:43 pm

1 stop8h 26m

$252

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/16

3:20 pm-11:10 pm

Nonstop4h 50m

Washington, D.C. Dulles Intl

Sat 1/17

5:27 pm-9:49 pm

1 stop7h 22m

$258

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 1/9

1:30 pm-11:06 pm

1 stop6h 36m

Washington, D.C. Dulles Intl

Sat 1/10

5:27 pm-9:49 pm

1 stop7h 22m

$268

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 1/5

11:15 pm-7:11 am

Nonstop4h 56m

Washington, D.C. Dulles Intl

Mon 1/12

5:17 pm-10:43 pm

1 stop8h 26m

$269

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 3/8

3:55 pm-11:48 pm

Nonstop4h 53m

Washington, D.C. Dulles Intl

Fri 3/13

12:12 pm-6:24 pm

1 stop9h 12m

$278

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 1/7

6:10 pm-5:04 pm

1 stop19h 54m

Washington, D.C. Dulles Intl

Wed 1/14

6:04 pm-9:08 pm

Nonstop6h 04m

$282

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 3/11

6:59 pm-5:27 pm

1 stop19h 28m

Washington, D.C. Dulles Intl

Thu 3/19

7:00 am-9:54 am

Nonstop5h 54m

$282

SpokaneWashington, D.C.

GEG - IAD

GEGIAD

Spokane

Thu 1/22

7:49 pm-4:26 pm

1 stop17h 37m

Washington, D.C. Dulles Intl

Wed 1/28

6:04 pm-12:44 pm

1 stop21h 40m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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, March is the cheapest month in which you can book a flight from State of Washington to Washington, D.C. Dulles Intl Airport (average of $143). Flying from State of Washington to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $294). 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 December 12, 2025.

A simple way to save on the total cost of your ticket is to fly from State of Washington to Washington, D.C. Dulles Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 32% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from State of Washington to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Washington to Dulles Intl. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to Washington, D.C. Dulles Intl Airport flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 12, 2025.

The most flights from USWA to IAD are scheduled on a Thursday (21 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 State of Washington to Washington, D.C. Dulles Intl Airport?

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 53m. Airlines will cover a distance of 2299 mi. This flight may include one or multiple stops.

  • 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: Copa Airlines (100%), Avianca (97%), United Airlines( 96%).

  • 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 $1,116, our data shows the cheapest flight currently is $157. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $189 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, March is the cheapest month in which you can book a flight from State of Washington to Washington, D.C. Dulles Intl Airport (average of $143). Flying from State of Washington to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $294). 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
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Fairfax
Linthicum Heights
Manassas
Rockville
Laurel
Towson
National Harbor
Bowie
Largo
McLean
Clinton

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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.
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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$143Average$332FlexibilityNo cancel feeOn-time85%
DeltaCheapest$149Average$406FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$188Average$300FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$257Average$494FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$277Average$514FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$336Average$708FlexibilityNo cancel feeOn-time71%

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