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 17 days ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$417 1$369 2$349 3$349 4$349 5$349 6$349 7$349 8$349 9$349 10$349 11$390 12$369 13$369 14$369 15$390 16$420 17$557 18$577 19$499 20$520 21$455 22$502 23$478 24$349 25$349 26$462 27$349 28$349 29$349 30$349 31$349 1$349 2$448 3$349

Extremely Rare Availability

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

Monday, December 14th, 2026

8 round-trip options

Returning

Sat, Dec 19, 2026•5 Day Trip

$400 USD

Google Flights

Returning

Sun, Dec 20, 2026•6 Day Trip

$369 USD

Google Flights

Returning

Mon, Dec 21, 2026•7 Day Trip

$453 USD

Google Flights

Returning

Thu, Dec 24, 2026•10 Day Trip

$400 USD

Google Flights

Returning

Fri, Dec 25, 2026•11 Day Trip

$453 USD

Google Flights

Returning

Sat, Dec 26, 2026•12 Day Trip

$655 USD

Google Flights

Returning

Sun, Dec 27, 2026•13 Day Trip

$828 USD

Google Flights

Returning

Mon, Dec 28, 2026•14 Day Trip

$453 USD

Google Flights

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

Seattle–Tacoma International Airport

Philadelphia International Airport

December 2026

Monday, December 14th, 2026