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

Saturday, August 29th, 2026

6 round-trip options

Returning
Thu, Sep 3, 2026•5 Day Trip
$352 USD
Google Flights
Returning
Mon, Sep 7, 2026•9 Day Trip
$443 USD
Google Flights
Returning
Tue, Sep 8, 2026•10 Day Trip
$387 USD
Google Flights
Returning
Wed, Sep 9, 2026•11 Day Trip
$387 USD
Google Flights
Returning
Fri, Sep 11, 2026•13 Day Trip
$387 USD
Google Flights
Returning
Sat, Sep 12, 2026•14 Day Trip
$427 USD
Google Flights