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

Tuesday, December 22nd, 2026

8 round-trip options

Returning
Sun, Dec 27, 2026•5 Day Trip
$581 USD
Google Flights
Returning
Mon, Dec 28, 2026•6 Day Trip
$581 USD
Google Flights
Returning
Tue, Dec 29, 2026•7 Day Trip
$654 USD
Google Flights
Returning
Wed, Dec 30, 2026•8 Day Trip
$579 USD
Google Flights
Returning
Sat, Jan 2, 2027•11 Day Trip
$621 USD
Google Flights
Returning
Sun, Jan 3, 2027•12 Day Trip
$616 USD
Google Flights
Returning
Mon, Jan 4, 2027•13 Day Trip
$581 USD
Google Flights
Returning
Tue, Jan 5, 2027•14 Day Trip
$574 USD
Google Flights