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

United AirlinesUAUnited Airlines
Round Trip•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesBOS

Logan International Airport

Boston, United States
$421 USD
-28%$303 USD
Verified 1 day ago
Limited Availability
10% of dates checked are available within 10% of the lowest price

Saturday, November 21st, 2026

3 round-trip options

Returning
Thu, Nov 26, 2026•5 Day Trip
$386 USD
Google Flights
Returning
Sat, Nov 28, 2026•7 Day Trip
$741 USD
Google Flights
Returning
Wed, Dec 2, 2026•11 Day Trip
$432 USD
Google Flights