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£134 Cheap Flights from Philadelphia (PHL) to Ontario Intl. Airport (ONT)

View £134 flight on Fri, 14 Aug 2026Opens in a new window

Popular airlines from Philadelphia International Airport (PHL) to Ontario Intl. Airport (ONT)

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Cheap Flights from Philadelphia (PHL) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at £134 for one-way flights and £284 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, 12 Aug - Fri, 28 Aug
PHL
Philadelphia
ONT
Ontario
£284 Return, found 5 days ago
£284
Return
found 5 days ago
Select Alaska Airlines flight, departing Wed, 12 Aug from Philadelphia to Ontario, returning Fri, 28 Aug, priced at £284 found 5 days ago
Delta
Fri, 21 Aug - Wed, 2 Sept
PHL
Philadelphia
ONT
Ontario
£299 Return, found 5 days ago
£299
Return
found 5 days ago
Select Delta flight, departing Fri, 21 Aug from Philadelphia to Ontario, returning Wed, 2 Sept, priced at £299 found 5 days ago
Alaska Airlines
Tue, 11 Aug - Fri, 28 Aug
PHL
Philadelphia
ONT
Ontario
£300 Return, found 5 days ago
£300
Return
found 5 days ago
Select Alaska Airlines flight, departing Tue, 11 Aug from Philadelphia to Ontario, returning Fri, 28 Aug, priced at £300 found 5 days ago
Delta
Fri, 14 Aug - Mon, 17 Aug
PHL
Philadelphia
ONT
Ontario
£306 Return, found 4 days ago
£306
Return
found 4 days ago
Select Delta flight, departing Fri, 14 Aug from Philadelphia to Ontario, returning Mon, 17 Aug, priced at £306 found 4 days ago
American Airlines
Fri, 14 Aug - Mon, 17 Aug
PHL
Philadelphia
ONT
Ontario
£320 Return, found 4 days ago
£320
Return
found 4 days ago
Select American Airlines flight, departing Fri, 14 Aug from Philadelphia to Ontario, returning Mon, 17 Aug, priced at £320 found 4 days ago
Alaska Airlines
Wed, 12 Aug - Wed, 2 Sept
PHL
Philadelphia
ONT
Ontario
£327 Return, found 5 days ago
£327
Return
found 5 days ago
Select Alaska Airlines flight, departing Wed, 12 Aug from Philadelphia to Ontario, returning Wed, 2 Sept, priced at £327 found 5 days ago
Delta
Wed, 12 Aug - Sat, 29 Aug
PHL
Philadelphia
ONT
Ontario
£328 Return, found 5 days ago
£328
Return
found 5 days ago
Select Delta flight, departing Wed, 12 Aug from Philadelphia to Ontario, returning Sat, 29 Aug, priced at £328 found 5 days ago
United
Tue, 11 Aug - Fri, 14 Aug
PHL
Philadelphia
ONT
Ontario
£329 Return, found 5 days ago
£329
Return
found 5 days ago
Select United flight, departing Tue, 11 Aug from Philadelphia to Ontario, returning Fri, 14 Aug, priced at £329 found 5 days ago
Delta
Fri, 14 Aug - Mon, 17 Aug
PHL
Philadelphia
ONT
Ontario
£335 Return, found 4 days ago
£335
Return
found 4 days ago
Select Delta flight, departing Fri, 14 Aug from Philadelphia to Ontario, returning Mon, 17 Aug, priced at £335 found 4 days ago
JetBlue Airways
Mon, 17 Aug - Mon, 24 Aug
PHL
Philadelphia
ONT
Ontario
£440 Return, found 6 days ago
£440
Return
found 6 days ago
Select JetBlue Airways flight, departing Mon, 17 Aug from Philadelphia to Ontario, returning Mon, 24 Aug, priced at £440 found 6 days ago

Find the cheapest month to fly from Philadelphia (PHL) to Ontario (ONT)

April is typically the cheapest month to fly

From £121 - £385 per traveller.

Frequently asked questions

How much does a flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) cost?
You can find one-way and return flights from PHL to ONT with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when PHL to ONT ticket fares go up or down.
What is the cheapest month to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT)?
The cheapest months to fly from PHL to ONT are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT)?
Enter PHL to ONT and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT)?
JetBlue Airways is one of the cheapest airlines offering connecting return flights from Philadelphia Intl. (PHL) to Ontario Intl. Airport (ONT), with prices starting from around £269 for flights that can be booked for departure within the next year. These flights typically include a layover in Logan Intl. (BOS). Prices are per adult, for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Philadelphia, PA (PHL) to Ontario Intl. Airport (ONT)?
To find a cheap flight from Philadelphia, PA (PHL) to Ontario Intl. Airport (ONT), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT)?
The earliest flight from Philadelphia International Airport (PHL) to Ontario International Airport (ONT) typically departs around 5:00 AM local time. This flight is operated by American Airlines. This is a seasonal service, active in January. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT)?
There are no nonstop flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT). The shortest flights typically involve one stop, taking around 7 hours 48 minutes. If you opt for flights with two or more stops, your travel time will increase to approximately 10 hours 48 minutes. The distance covered on this route is about 3,782 kilometers. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some flexibility in your travel plans.
Can you fly business or first class from Philadelphia, PA (PHL) to Ontario Intl. Airport (ONT)?
Select the "Business class" and "First class" filters when looking for Philadelphia, PA (PHL) to Ontario Intl. Airport (ONT) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) flight with Expedia?
It's easy to earn miles on a Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Ontario Intl. Airport (ONT) from Philadelphia, PA (PHL)?
If you're planning to travel to Ontario from Philadelphia Intl. (PHL), you can fly directly into Los Angeles - Ontario Intl. (ONT) which offers international flights and connections. Some flights may connect through major hubs like O'Hare Intl. (ORD), Seattle - Tacoma Intl. (SEA), or Midway Intl. (MDW) before reaching Ontario. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) at the last minute?
Typically, booking a last minute flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) flight and hotel package?
Securing a Philadelphia, PA (PHL-Philadelphia Intl.) to Ontario Intl. Airport (ONT) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Philadelphia, PA (PHL) to Ontario Intl. Airport (ONT)?
If you booked your Philadelphia, PA (PHL) to Ontario Intl. Airport (ONT) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Ontario Intl. Airport
Return price
£283
Distance
3759 km
Average flight time
9 hours 12 mins

Book with confidence

Compare flights from Philadelphia to Ontario Intl. Airport easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Philadelphia to Ontario Intl. Airport. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Ontario Intl. Airport in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Philadelphia Intl. to Ontario Intl. Airport.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Philadelphia Intl. (PHL) to Ontario Intl. Airport (ONT)

The easiest way to view the best deals on flights from Philadelphia to Ontario Intl. Airport today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Philadelphia Intl. to Ontario Intl. Airport start at just £284 and range up to £440.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Philadelphia and Ontario Intl. Airport
  • booking your flight during August, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Philadelphia to Ontario Intl. Airport flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Philadelphia Intl. to Ontario Intl. Airport for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Philadelphia to Ontario Intl. Airport easily and book with confidence

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*Available to Expedia members.