BOS to SEA from $303 in economy – flightdeals.net

Home Premium Fare Deals About

United Airlines

UAUnited Airlines

Round Trip•Economy

Logan International Airport

Boston, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$417 USD

-27%$303 USD

Verified 1 day ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$332 1$303 2$303 3$354 4$332 5$303 6$325 7$354 8$303 9$303 10$332 11$325 12$303 13$332 14$362 15$303 16$303 17$332 18$332 19$303 20$332 21$332 22$303 23$303 24$332 25$332 26$303 27$417 28$332 29$303 30$303 1$332 2$332 3$303 4$418

Limited Availability

10% of dates checked are available within 10% of the lowest price

Monday, September 14th, 2026

5 round-trip options

Returning

Sun, Sep 20, 2026•6 Day Trip

$391 USD

Returning

Tue, Sep 22, 2026•8 Day Trip

$362 USD

Returning

Fri, Sep 25, 2026•11 Day Trip

$391 USD

Returning

Sat, Sep 26, 2026•12 Day Trip

$362 USD

Returning

Sun, Sep 27, 2026•13 Day Trip

$391 USD