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, July 31st, 2026

6 round-trip options

Returning
Wed, Aug 5, 2026•5 Day Trip
$642 USD
Google Flights
Returning
Sat, Aug 8, 2026•8 Day Trip
$597 USD
Google Flights
Returning
Mon, Aug 10, 2026•10 Day Trip
$597 USD
Google Flights
Returning
Tue, Aug 11, 2026•11 Day Trip
$597 USD
Google Flights
Returning
Wed, Aug 12, 2026•12 Day Trip
$597 USD
Google Flights
Returning
Fri, Aug 14, 2026•14 Day Trip
$597 USD
Google Flights