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

September 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$304 1$273 2$273 3$320 4$304 5$338 6$341 7$401 8$357 9$273 10$304 11$304 12$273 13$304 14$304 15$273 16$273 17$309 18$304 19$273 20$304 21$304 22$273 23$273 24$304 25$304 26$273 27$304 28$304 29$273 30$273 1$304 2$304 3$273 4$304

Extremely Rare Availability

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

Monday, September 21st, 2026

6 round-trip options

Returning

Sat, Sep 26, 2026•5 Day Trip

$304 USD

Google Flights

Returning

Sun, Sep 27, 2026•6 Day Trip

$352 USD

Google Flights

Returning

Mon, Sep 28, 2026•7 Day Trip

$335 USD

Google Flights

Returning

Wed, Sep 30, 2026•9 Day Trip

$304 USD

Google Flights

Returning

Fri, Oct 2, 2026•11 Day Trip

$335 USD

Google Flights

Returning

Sun, Oct 4, 2026•13 Day Trip

$335 USD

Google Flights

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

Seattle–Tacoma International Airport

Philadelphia International Airport

September 2026

Monday, September 21st, 2026