
Popular airlines from Washington Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA)
- American Airlines
American Airlines
- Alaska Airlines
Alaska Airlines
- Delta
Delta
- Hawaiian Airlines
Hawaiian Airlines
- United
United
- Plan, book, fly with confidence
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Cheap flights from Washington (IAD) to Seattle (SEA)
Prices were available within the past 7 days and start at CA $190 for one-way flights and CA $352 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.










Find the cheapest month to fly from Washington (IAD) to Seattle (SEA)
September is typically the cheapest month to fly
Graph displaying average flight prices per month
Origin airport | Washington Dulles Intl. |
Destination airport | Seattle - Tacoma Intl. |
Airlines serving | Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United |
Roundtrip price | CA $352 |
Distance | 3679 km |
Average flight time | 2 hours 48 mins |
Chantilly to Seattle Flights
The easy way to book your flights from Washington to Seattle
With Expedia, it’s simple to find and book flights to Seattle from Washington whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are American Airlines, Qatar Airways, JAL, Austrian, China Eastern Airlines, Delta Air Lines, Copa Airlines, United Airlines, Ethiopian Airlines, Alaska Airlines, Avianca, Finnair, Iberia, Hawaiian Airlines, Korean Air, Air Tahiti Nui, Brussels Airlines, Lufthansa nonstop flights to Seattle - Tacoma Intl., too.
Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Washington to Seattle today, tomorrow, or this week.
Save dollars with cheap flights from Washington Dulles Intl., IAD to Seattle - Tacoma Intl., SEA
Sort your search results by price to find great deals on your flight from Washington to Seattle—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Seattle from Washington currently is just CA $352 rising to CA $503.
Here are more money-saving tips:
- Fly in August when flight prices are normally at their lowest
- Book about a month to 6 weeks before you travel for the best prices to Seattle
- Avoid peak season and weekends when flights can cost more
- Early morning and late-night flights are sometimes cheaper, so try varying your travel times
- One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!
Reasons to choose Expedia for your flight to Seattle from Washington
Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Seattle with Expedia today.
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