Cheap Flights from Washington (IAD) to Seattle (SEA)
Photo by Port of Seattle
Open Photo by Port of Seattle
Popular airlines from Washington Dulles Intl. Airport (IAD) to Seattle-Tacoma International Airport (SEA)
Alaska AirlinesAlaska Airlines
DeltaDelta
American AirlinesAmerican Airlines
UnitedUnited
Frontier AirlinesFrontier Airlines
Sun Country AirlinesSun Country Airlines
Be in the knowGet alerts if flight prices drop or rise*
Book smarterSave on select hotels after you book a flight*
Find the right fitWe search billions of combinations of flights to help you find your next adventure
Travel information
Origin airport | Washington Dulles Intl. Airport |
|---|---|
Destination airport | Seattle-Tacoma International Airport |
Distance | 3,701 km away |
Airlines serving | Alaska Airlines, Delta, American Airlines, United, Frontier Airlines, Sun Country Airlines |
Popular airline | Alaska Airlines |
Average flight time | 6 hours 39 mins |
*Available to One Key members.