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

United AirlinesUAUnited Airlines
Round Trip•Economy
United StatesBOS

Logan International Airport

Boston, United States
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
$417 USD
-27%$303 USD
Verified 1 day ago
Limited Availability
10% of dates checked are available within 10% of the lowest price

Friday, August 28th, 2026

6 round-trip options

Returning
Wed, Sep 2, 2026•5 Day Trip
$332 USD
Google Flights
Returning
Sat, Sep 5, 2026•8 Day Trip
$332 USD
Google Flights
Returning
Mon, Sep 7, 2026•10 Day Trip
$361 USD
Google Flights
Returning
Tue, Sep 8, 2026•11 Day Trip
$332 USD
Google Flights
Returning
Wed, Sep 9, 2026•12 Day Trip
$332 USD
Google Flights
Returning
Fri, Sep 11, 2026•14 Day Trip
$354 USD
Google Flights