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

Monday, November 2nd, 2026

3 round-trip options

Returning
Sat, Nov 7, 2026•5 Day Trip
$354 USD
Google Flights
Returning
Mon, Nov 9, 2026•7 Day Trip
$356 USD
Google Flights
Returning
Fri, Nov 13, 2026•11 Day Trip
$356 USD
Google Flights