PHL to SEA from $337 in economy – flightdeals.net

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United Airlines

UAUnited Airlines

Round Trip•Economy

Philadelphia International Airport

Philadelphia, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$417 USD

-19%$337 USD

Verified 1 day ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$899 1$420 2$415 3$538 4$538 5$467 6$480 7$581 8$446 9$358 10$391 11$374 12$358 13$514 14$459 15$376 16$337 17$423 18$439 19$337 20$504 21$392 22$337 23$337 24$337 25$369 26$337 27$399 28$337 29$337 30$337 1$353 2$369 3$337 4$368

Good Availability

57% of dates checked are available within 10% of the lowest price

Friday, September 18th, 2026

1 round-trip options

Returning

Fri, Sep 25, 2026•7 Day Trip

$439 USD