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

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$824 1$647 2$401 3$354 4$387 5$354 6$354 7$354 8$354 9$354 10$354 11$354 12$391 13$436 14$354 15$387 16$438 17$516 18$710 19$586 20$387 21$516 22$632 23$781 24$391 25$492 26$803 27$803 28$716 29$672 30$507 31$494 1$440 2$586 3$620

Good Availability

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

Thursday, December 17th, 2026

7 round-trip options

Returning

Wed, Dec 23, 2026•6 Day Trip

$516 USD

Google Flights

Returning

Thu, Dec 24, 2026•7 Day Trip

$516 USD

Google Flights

Returning

Fri, Dec 25, 2026•8 Day Trip

$516 USD

Google Flights

Returning

Sun, Dec 27, 2026•10 Day Trip

$597 USD

Google Flights

Returning

Tue, Dec 29, 2026•12 Day Trip

$597 USD

Google Flights

Returning

Wed, Dec 30, 2026•13 Day Trip

$516 USD

Google Flights

Returning

Thu, Dec 31, 2026•14 Day Trip

$516 USD

Google Flights

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

Philadelphia International Airport

Ontario International Airport

December 2026

Thursday, December 17th, 2026