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

Wednesday, October 21st, 2026

3 round-trip options

Returning
Thu, Oct 29, 2026•8 Day Trip
$332 USD
Google Flights
Returning
Sat, Oct 31, 2026•10 Day Trip
$330 USD
Google Flights
Returning
Sun, Nov 1, 2026•11 Day Trip
$368 USD
Google Flights