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Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from C$ 195

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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
28 May — 4 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl are usually found in February or October, booked 77 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap flight deals from Seattle to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Dulles Intl
Explore the most affordable flight options available from Seattle to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Thu 4/64:05 p.m.
SEA
-
IAD
Nonstop5h 08m
Delta
Tue 9/67:00 a.m.
IAD
-
SEA
Nonstop5h 45m
Delta
Deal found 23/4C$ 334
Thu 4/64:05 p.m.
SEA
-
IAD
Nonstop5h 08m
Delta
Wed 10/67:00 a.m.
IAD
-
SEA
Nonstop5h 45m
Delta
Deal found 25/4C$ 335
Thu 4/68:20 p.m.
SEA
-
IAD
1 stop8h 52m
Frontier
Tue 9/69:55 a.m.
IAD
-
SEA
1 stop27h 40m
Frontier
Deal found 26/4C$ 337
Fri 4/96:00 p.m.
SEA
-
IAD
1 stop8h 25m
United Airlines
Mon 7/912:35 p.m.
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 27/4C$ 348
Thu 4/63:53 p.m.
SEA
-
IAD
Nonstop5h 06m
Multiple Airlines
Mon 8/69:12 a.m.
IAD
-
SEA
1 stop28h 23m
Multiple Airlines
Deal found 26/4C$ 359
Thu 13/82:26 p.m.
SEA
-
IAD
1 stop7h 14m
United Airlines
Wed 19/86:30 a.m.
IAD
-
SEA
1 stop8h 04m
United Airlines
Deal found 23/4C$ 361
Thu 10/98:10 a.m.
SEA
-
IAD
Nonstop5h 05m
United Airlines
Sun 13/912:35 p.m.
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 27/4C$ 368
Thu 4/68:20 p.m.
SEA
-
IAD
1 stop8h 52m
Multiple Airlines
Tue 9/66:00 a.m.
IAD
-
SEA
Nonstop5h 46m
Multiple Airlines
Deal found 26/4C$ 380
Fri 10/711:20 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Mon 13/75:38 p.m.
IAD
-
SEA
1 stop9h 36m
United Airlines
Deal found 25/4C$ 382
Fri 14/811:10 p.m.
SEA
-
IAD
Nonstop5h 02m
United Airlines
Wed 19/812:35 p.m.
IAD
-
SEA
Nonstop5h 45m
United Airlines
Deal found 26/4C$ 386
Thu 24/99:32 p.m.
SEA
-
IAD
Nonstop5h 08m
Alaska Airlines
Mon 28/95:54 p.m.
IAD
-
SEA
Nonstop5h 50m
Alaska Airlines
Deal found 28/4C$ 389
Thu 11/67:40 a.m.
SEA
-
IAD
Nonstop5h 09m
United Airlines
Tue 16/65:38 p.m.
IAD
-
SEA
1 stop9h 21m
United Airlines
Deal found 23/4C$ 390

Find flight deals from Seattle to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 28 April 2026.

Round-trip from

C$ 334

One-way from

C$ 195

Popular in

January

Cheapest in

February

Average price

C$ 484

Good round-trip deal

C$ 1,902 or less
United Airlines
  • United Airlines
  • 3/9-6/9
  • Nonstop
  • 10h 47m total
  • Seattle to Washington, D.C.
Search Deals
United Airlines
  • United Airlines
  • 18/9
  • Nonstop
  • 5h 02m total
  • Seattle to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 91 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle 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 629,999 searches. Data last updated 28 April 2026.
Use the filters below to find and compare flights from Seattle to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 10/7

4:00 p.m.-12:03 a.m.

Nonstop5h 03m

Washington, D.C. Dulles Intl

Sun 12/7

7:00 a.m.-9:45 a.m.

Nonstop5h 45m

C$ 398

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 21/8

2:26 p.m.-12:40 a.m.

1 stop7h 14m

Washington, D.C. Dulles Intl

Sun 30/8

5:41 p.m.-11:11 p.m.

1 stop8h 30m

C$ 443

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 4/6

3:53 p.m.-11:59 p.m.

Nonstop5h 06m

Washington, D.C. Dulles Intl

Tue 9/6

5:35 p.m.-8:29 p.m.

Nonstop5h 54m

C$ 455

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 2/7

2:33 p.m.-12:45 a.m.

1 stop7h 12m

Washington, D.C. Dulles Intl

Tue 7/7

5:55 p.m.-8:46 p.m.

Nonstop5h 51m

C$ 459

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 26/5

8:22 a.m.-4:35 p.m.

Nonstop5h 13m

Washington, D.C. Dulles Intl

Sat 30/5

9:00 a.m.-11:45 a.m.

Nonstop5h 45m

C$ 459

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 14/8

2:26 p.m.-12:40 a.m.

1 stop7h 14m

Washington, D.C. Dulles Intl

Wed 19/8

5:41 p.m.-11:11 p.m.

1 stop8h 30m

C$ 461

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 18/6

4:20 p.m.-12:25 a.m.

Nonstop5h 05m

Washington, D.C. Dulles Intl

Mon 22/6

7:00 a.m.-9:45 a.m.

Nonstop5h 45m

C$ 465

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 3/9

3:55 p.m.-11:55 p.m.

Nonstop5h 00m

Washington, D.C. Dulles Intl

Sun 6/9

7:10 a.m.-10:03 a.m.

Nonstop5h 53m

C$ 465

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 25/5

11:30 p.m.-7:34 a.m.

Nonstop5h 04m

Washington, D.C. Dulles Intl

Mon 1/6

9:00 a.m.-11:45 a.m.

Nonstop5h 45m

C$ 521
Cheapest one-way

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 10/6

4:01 p.m.-11:59 p.m.

Nonstop4h 58m

C$ 195

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/4

Showing 1-10 of 21 resultsSorted by cheapest first
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2
3

Best time to book a flight from Seattle to Dulles Intl

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

How far ahead should I book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

Booking 64 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Dulles Intl Airport (average of C$ 413). Flying from Seattle to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of C$ 893). 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 SEA to IAD?

Find hourly flight availability from Seattle 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 28 April 2026.

A simple way to save on the total cost of your ticket is to fly from Seattle 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 78% on your trip compared to booking a flight at noon.

How much does it cost to fly round-trip from Seattle 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 28 April 2026.
Read reviews from past customers who have flown Hawaiian Airlines from Seattle to Washington, D.C. Dulles Intl Airport. 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.
Hawaiian Airlines
7.8
Good
2,837 reviews
Check prices

Crew

8.5

Comfort

7.7

Entertainment

7.1

Boarding

8.0

Overall

7.8

Food

6.9

Reviews

1 / 20
6.0
Good

Patrick,Feb 2026

SEA - PHX

Was not able to check in online, had to go to multiple lines at airport to get boarding pass and was not able to get a seat without going to the gate, wound up in middle in the back.
Hawaiian Airlines
7.8
Good
2,837 reviews
Hawaiian Airlines
7.8
Good
2,837 reviews
Check prices

Crew

8.5

Comfort

7.7

Entertainment

7.1

Boarding

8.0

Overall

7.8

Food

6.9

Reviews

1 / 20
6.0
Good

Patrick,Feb 2026

SEA - PHX

Was not able to check in online, had to go to multiple lines at airport to get boarding pass and was not able to get a seat without going to the gate, wound up in middle in the back.

Related info for your journey

Find useful and relevant information for your journey from Seattle 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 airport do you fly from for flights from Seattle to Washington, D.C. Dulles Intl?

    If you book a flight to Washington, D.C. Dulles Intl from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 18.4 km from the centre of Seattle. There are 13 flights from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl per day from 1 airline.

  • How long is the flight from Seattle to Washington, D.C. Dulles Intl Airport?

    United Airlines and Alaska Airlines can get you from Seattle to Washington, D.C. Dulles Intl Airport in just under 5h 06m. Your travel time can differ by up to 2h 08m. Seattle and Washington, D.C. Dulles Intl Airport are separated by a distance of 3700 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Seattle to Washington, D.C. Dulles Intl Airport round-trip?

    Our cheapest airline available from Seattle to Washington, D.C. Dulles Intl Airport is Hawaiian Airlines. Our recent data shows that you can find tickets from as low as C$ 358 on this airline. Hawaiian Airlines is 38% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most reliable airlines from Seattle 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 Seattle to Washington, D.C. Dulles Intl Airport on time: Iberia (100%), ITA Airways (100%), Lufthansa (100%).

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

    While on average a flight from Seattle to Washington, D.C. Dulles Intl Airport is generally C$ 2,010, our data shows the cheapest flight currently is C$ 1,902. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay C$ 346 for that flight.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Dulles Intl Airport (average of C$ 413). Flying from Seattle to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of C$ 893). 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

Travelling 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
Silver Spring
Warrenton
Winchester
Hanover
Fairfax
Reston
Ellicott City
Oxon Hill
Gaithersburg
Arlington
Herndon
Manassas
Fredericksburg
Alexandria
Rockville

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Reagan-National flights

Top airline flying from Seattle to Dulles Intl

Discover the top airline that operate flights from Seattle 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 629,999 searches. Data last updated 28 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapestC$ 358AverageC$ 358FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Dulles Intl?

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Dulles Intl?

Cheapflights helps you find that perfect flight to Dulles Intl from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Seattle to Dulles Intl with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Seattle to Dulles Intl, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Seattle to Dulles Intl become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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