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 2 days ago
Limited Availability
10% of dates checked are available within 10% of the lowest price

Thursday, December 3rd, 2026

8 round-trip options

Returning
Tue, Dec 8, 2026•5 Day Trip
$421 USD
Google Flights
Returning
Wed, Dec 9, 2026•6 Day Trip
$421 USD
Google Flights
Returning
Thu, Dec 10, 2026•7 Day Trip
$423 USD
Google Flights
Returning
Fri, Dec 11, 2026•8 Day Trip
$423 USD
Google Flights
Returning
Mon, Dec 14, 2026•11 Day Trip
$431 USD
Google Flights
Returning
Tue, Dec 15, 2026•12 Day Trip
$429 USD
Google Flights
Returning
Wed, Dec 16, 2026•13 Day Trip
$472 USD
Google Flights
Returning
Thu, Dec 17, 2026•14 Day Trip
$575 USD
Google Flights