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
$451 USD
-43%$255 USD
Verified 2 days ago
Extremely Rare Availability
3% of dates checked are available within 10% of the lowest price

Friday, July 31st, 2026

10 round-trip options

Returning
Wed, Aug 5, 2026•5 Day Trip
$335 USD
Google Flights
Returning
Thu, Aug 6, 2026•6 Day Trip
$426 USD
Google Flights
Returning
Fri, Aug 7, 2026•7 Day Trip
$426 USD
Google Flights
Returning
Sat, Aug 8, 2026•8 Day Trip
$345 USD
Google Flights
Returning
Sun, Aug 9, 2026•9 Day Trip
$380 USD
Google Flights
Returning
Mon, Aug 10, 2026•10 Day Trip
$295 USD
Google Flights
Returning
Tue, Aug 11, 2026•11 Day Trip
$295 USD
Google Flights
Returning
Wed, Aug 12, 2026•12 Day Trip
$295 USD
Google Flights
Returning
Thu, Aug 13, 2026•13 Day Trip
$295 USD
Google Flights
Returning
Fri, Aug 14, 2026•14 Day Trip
$295 USD
Google Flights