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

Monday, December 21st, 2026

7 round-trip options

Returning
Sat, Dec 26, 2026•5 Day Trip
$697 USD
Google Flights
Returning
Mon, Dec 28, 2026•7 Day Trip
$637 USD
Google Flights
Returning
Thu, Dec 31, 2026•10 Day Trip
$592 USD
Google Flights
Returning
Fri, Jan 1, 2027•11 Day Trip
$637 USD
Google Flights
Returning
Sat, Jan 2, 2027•12 Day Trip
$637 USD
Google Flights
Returning
Sun, Jan 3, 2027•13 Day Trip
$637 USD
Google Flights
Returning
Mon, Jan 4, 2027•14 Day Trip
$552 USD
Google Flights