$154 Cheap American Airlines flights Philadelphia (PHL) to Ontario (ONT)

Use the “Price (lowest to highest)” filter on Expedia to search for cheap American Airlines return flights from $268 from PHL to ONT. Affordable one-way options from $154 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

American Airlines flights to Ontario are usually more affordable in the off-peak months of January and April. Whether you need a one-way or a return ticket, you could land a better deal then.

Search for cheap American Airlines flights from Philadelphia Intl. Airport (PHL) to Los Angeles - Ontario Intl. Airport (ONT) one to three months ahead of your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and itinerary, the best day to book a domestic flight is generally Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Simply enter your dates, hit search and select the “Nonstop” filter on Expedia to find any direct flights from PHL to ONT with American Airlines or other airlines.

Find American Airlines’s earliest flights from PHL to ONT by checking the “Early Morning” and “Morning” filters. Not only will you arrive sooner, early departures also have a 20% less chance of being canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Los Angeles - Ontario Intl. Airport (ONT) is the main Ontario hub for American Airlines flights from Philadelphia Intl. Airport (PHL).

Depending on the ticket type you purchased, a fee generally applies if you cancel or reschedule your booking more than 24 hours after it’s been confirmed. To find tickets with more flexibility, select our “Changes included” and “No cancel fee” boxes when looking for flights. For more information on changing or canceling your reservation, visit “Trips,” select your flight and tick “Manage Booking.”