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

Thursday, October 15th, 2026

3 round-trip options

Returning
Fri, Oct 23, 2026•8 Day Trip
$482 USD
Google Flights
Returning
Sun, Oct 25, 2026•10 Day Trip
$650 USD
Google Flights
Returning
Mon, Oct 26, 2026•11 Day Trip
$518 USD
Google Flights