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

Delta Air LinesDLDelta Air Lines
Round Trip•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesBOS

Logan International Airport

Boston, United States
$434 USD
-27%$317 USD
Verified 18 days ago
Extremely Rare Availability
2% of dates checked are available within 10% of the lowest price

Saturday, December 19th, 2026

9 round-trip options

Returning
Thu, Dec 24, 2026•5 Day Trip
$483 USD
Google Flights
Returning
Fri, Dec 25, 2026•6 Day Trip
$513 USD
Google Flights
Returning
Sat, Dec 26, 2026•7 Day Trip
$723 USD
Google Flights
Returning
Sun, Dec 27, 2026•8 Day Trip
$643 USD
Google Flights
Returning
Mon, Dec 28, 2026•9 Day Trip
$643 USD
Google Flights
Returning
Tue, Dec 29, 2026•10 Day Trip
$553 USD
Google Flights
Returning
Wed, Dec 30, 2026•11 Day Trip
$553 USD
Google Flights
Returning
Thu, Dec 31, 2026•12 Day Trip
$513 USD
Google Flights
Returning
Fri, Jan 1, 2027•13 Day Trip
$569 USD
Google Flights