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 3 hours ago
Extremely Rare Availability
4% of dates checked are available within 10% of the lowest price

Sunday, December 6th, 2026

7 round-trip options

Returning
Fri, Dec 11, 2026•5 Day Trip
$487 USD
Google Flights
Returning
Sun, Dec 13, 2026•7 Day Trip
$447 USD
Google Flights
Returning
Wed, Dec 16, 2026•10 Day Trip
$447 USD
Google Flights
Returning
Thu, Dec 17, 2026•11 Day Trip
$542 USD
Google Flights
Returning
Fri, Dec 18, 2026•12 Day Trip
$778 USD
Google Flights
Returning
Sat, Dec 19, 2026•13 Day Trip
$778 USD
Google Flights
Returning
Sun, Dec 20, 2026•14 Day Trip
$542 USD
Google Flights