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

Friday, July 31st, 2026

6 round-trip options

Returning
Wed, Aug 5, 2026•5 Day Trip
$627 USD
Google Flights
Returning
Sun, Aug 9, 2026•9 Day Trip
$717 USD
Google Flights
Returning
Mon, Aug 10, 2026•10 Day Trip
$643 USD
Google Flights
Returning
Tue, Aug 11, 2026•11 Day Trip
$587 USD
Google Flights
Returning
Thu, Aug 13, 2026•13 Day Trip
$552 USD
Google Flights
Returning
Fri, Aug 14, 2026•14 Day Trip
$627 USD
Google Flights