Boston (BOS) to Seattle / Tacoma (SEA) flight deal in economy from $303

United AirlinesUAUnited Airlines
Round Trip•Economy
United StatesBOS

Logan International Airport

Boston, United States
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
$417 USD
-27%$303 USD
Verified 1 day ago
Limited Availability
10% of dates checked are available within 10% of the lowest price

Sunday, October 18th, 2026

5 round-trip options

Returning
Sat, Oct 24, 2026•6 Day Trip
$503 USD
Google Flights
Returning
Mon, Oct 26, 2026•8 Day Trip
$532 USD
Google Flights
Returning
Thu, Oct 29, 2026•11 Day Trip
$538 USD
Google Flights
Returning
Fri, Oct 30, 2026•12 Day Trip
$531 USD
Google Flights
Returning
Sat, Oct 31, 2026•13 Day Trip
$531 USD
Google Flights