Boston (BOS) to Seattle / Tacoma (SEA) flight deal in economy from $317

Delta Air LinesDLDelta Air Lines
Round Trip•Economy
United StatesBOS

Logan International Airport

Boston, United States
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
$447 USD
-29%$317 USD
Verified 16 days ago
Extremely Rare Availability
3% of dates checked are available within 10% of the lowest price

Monday, October 5th, 2026

5 round-trip options

Returning
Sat, Oct 10, 2026•5 Day Trip
$352 USD
Google Flights
Returning
Sun, Oct 11, 2026•6 Day Trip
$462 USD
Google Flights
Returning
Mon, Oct 12, 2026•7 Day Trip
$387 USD
Google Flights
Returning
Tue, Oct 13, 2026•8 Day Trip
$352 USD
Google Flights
Returning
Sat, Oct 17, 2026•12 Day Trip
$352 USD
Google Flights