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 8th, 2026

3 round-trip options

Returning
Fri, Oct 16, 2026•8 Day Trip
$361 USD
Google Flights
Returning
Sun, Oct 18, 2026•10 Day Trip
$532 USD
Google Flights
Returning
Mon, Oct 19, 2026•11 Day Trip
$449 USD
Google Flights