SEA to PHL from $273 in economy

UAUnited Airlines

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

PHL

Philadelphia International Airport

Philadelphia, United States

$399 USD

-32%$273 USD

Verified 16 days ago

July 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29 30 1 2 3 4 5$508 6$439 7$768 8$374 9$434 10$437 11$374 12$437 13$439 14$374 15$374 16$433 17$470 18$467 19$519 20$488 21$391 22$397 23$444 24$395 25$439 26$488 27$444 28$307 29$322 30$397 31$343 1$415 2$470

Extremely Rare Availability

3% of dates checked are available within 10% of the lowest price

Thursday, July 16th, 2026

7 round-trip options

Returning

Wed, Jul 22, 2026•6 Day Trip

$433 USD

Google Flights

Returning

Thu, Jul 23, 2026•7 Day Trip

$584 USD

Google Flights

Returning

Fri, Jul 24, 2026•8 Day Trip

$520 USD

Google Flights

Returning

Sun, Jul 26, 2026•10 Day Trip

$568 USD

Google Flights

Returning

Mon, Jul 27, 2026•11 Day Trip

$466 USD

Google Flights

Returning

Tue, Jul 28, 2026•12 Day Trip

$521 USD

Google Flights

Returning

Thu, Jul 30, 2026•14 Day Trip

$573 USD

Google Flights

Seattle / Tacoma (SEA) to Philadelphia (PHL) flight deal in economy from $273

Seattle–Tacoma International Airport

Philadelphia International Airport

July 2026

Thursday, July 16th, 2026