PHL to ONT from $354 in economy

UAUnited Airlines

Round Trip•Economy

PHL

Philadelphia International Airport

Philadelphia, United States

ONT

Ontario International Airport

Ontario, United States

$463 USD

-24%$354 USD

Verified 13 days ago

September 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$354 1$359 2$354 3$354 4$354 5$359 6$359 7$432 8$397 9$359 10$354 11$354 12$359 13$354 14$354 15$359 16$364 17$354 18$354 19$359 20$354 21$354 22$359 23$359 24$354 25$354 26$388 27$354 28$354 29$359 30$359 1$354 2$354 3$359 4$354

Good Availability

45% of dates checked are available within 10% of the lowest price

Monday, September 21st, 2026

6 round-trip options

Returning

Sun, Sep 27, 2026•6 Day Trip

$432 USD

Google Flights

Returning

Mon, Sep 28, 2026•7 Day Trip

$383 USD

Google Flights

Returning

Thu, Oct 1, 2026•10 Day Trip

$354 USD

Google Flights

Returning

Fri, Oct 2, 2026•11 Day Trip

$354 USD

Google Flights

Returning

Sat, Oct 3, 2026•12 Day Trip

$354 USD

Google Flights

Returning

Sun, Oct 4, 2026•13 Day Trip

$387 USD

Google Flights

Philadelphia (PHL) to Ontario (ONT) flight deal in economy from $354

Philadelphia International Airport

Ontario International Airport

September 2026

Monday, September 21st, 2026