
Popular airlines from Washington Dulles Intl. Airport (IAD) to Seattle-Tacoma International Airport (SEA)
- American Airlines
American Airlines
- Delta
Delta
- United
United
- Plan, book, fly with confidence
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Cheap flights from Washington to Seattle (IAD-SEA)
Prices were available within the past 7 days and start at €145 for one-way flights and €237 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, 23 Aug - Sat, 30 Aug
IAD
Washington
SEA
Seattle
€237 Return, found 11 hours ago
€237
Return
found 11 hours ago

Sat, 11 Oct - Tue, 14 Oct
IAD
Washington
SEA
Seattle
€264 Return, found 1 day ago
€264
Return
found 1 day ago

Mon, 18 Aug - Mon, 25 Aug
IAD
Washington
SEA
Seattle
€266 Return, found 2 days ago
€266
Return
found 2 days ago

Mon, 18 Aug - Mon, 25 Aug
IAD
Washington
SEA
Seattle
€291 Return, found 2 days ago
€291
Return
found 2 days ago

Fri, 10 Oct - Tue, 14 Oct
IAD
Washington
SEA
Seattle
€317 Return, found 1 day ago
€317
Return
found 1 day ago

Fri, 10 Oct - Tue, 14 Oct
IAD
Washington
SEA
Seattle
€324 Return, found 1 day ago
€324
Return
found 1 day ago

Sat, 11 Oct - Tue, 14 Oct
IAD
Washington
SEA
Seattle
€325 Return, found 1 day ago
€325
Return
found 1 day ago

Sat, 23 Aug - Sat, 30 Aug
IAD
Washington
SEA
Seattle
€331 Return, found 11 hours ago
€331
Return
found 11 hours ago

Sat, 23 Aug - Sat, 30 Aug
IAD
Washington
SEA
Seattle
€339 Return, found 11 hours ago
€339
Return
found 11 hours ago

Sat, 23 Aug - Sat, 30 Aug
IAD
Washington
SEA
Seattle
€339 Return, found 11 hours ago
€339
Return
found 11 hours ago
Find the cheapest month to fly from Washington (IAD) to Seattle (SEA)
September is typically the cheapest month to fly
From €158 - €255 per traveller.
Graph displaying average flight prices per month
Origin airport | Washington Dulles Intl. |
Destination airport | Seattle - Tacoma Intl. |
Airlines serving | American Airlines, Delta, United |
Return price | €237 |
Distance | 3679 km |
Average flight time | 2 hours 48 mins |
Perfect flights from Washington to Seattle
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Our flexible Washington Dulles Intl. to Seattle - Tacoma Intl. ticket options cater to your travel preferences, with incredible one-way fares from €145 and roundtrip prices from €237. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
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