Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $255

Alaska Airlines, Inc.ASAlaska Airlines, Inc.
Round Trip•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesIAD

Washington Dulles International Airport

Washington, United States
$458 USD
-44%$255 USD
Verified about 1 hour ago
Extremely Rare Availability
4% of dates checked are available within 10% of the lowest price

Sunday, August 16th, 2026

9 round-trip options

Returning
Fri, Aug 21, 2026•5 Day Trip
$466 USD
Google Flights
Returning
Sat, Aug 22, 2026•6 Day Trip
$426 USD
Google Flights
Returning
Sun, Aug 23, 2026•7 Day Trip
$386 USD
Google Flights
Returning
Mon, Aug 24, 2026•8 Day Trip
$386 USD
Google Flights
Returning
Tue, Aug 25, 2026•9 Day Trip
$386 USD
Google Flights
Returning
Wed, Aug 26, 2026•10 Day Trip
$386 USD
Google Flights
Returning
Fri, Aug 28, 2026•12 Day Trip
$471 USD
Google Flights
Returning
Sat, Aug 29, 2026•13 Day Trip
$386 USD
Google Flights
Returning
Sun, Aug 30, 2026•14 Day Trip
$386 USD
Google Flights