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 29th, 2026

8 round-trip options

Returning
Sun, Jan 3, 2027•5 Day Trip
$590 USD
Google Flights
Returning
Mon, Jan 4, 2027•6 Day Trip
$555 USD
Google Flights
Returning
Tue, Jan 5, 2027•7 Day Trip
$548 USD
Google Flights
Returning
Wed, Jan 6, 2027•8 Day Trip
$548 USD
Google Flights
Returning
Sat, Jan 9, 2027•11 Day Trip
$548 USD
Google Flights
Returning
Sun, Jan 10, 2027•12 Day Trip
$550 USD
Google Flights
Returning
Mon, Jan 11, 2027•13 Day Trip
$550 USD
Google Flights
Returning
Tue, Jan 12, 2027•14 Day Trip
$595 USD
Google Flights