$69 Cheap Flights from Ontario (ONT) to Philadelphia (PHL)

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Cheap flights from Ontario (ONT) to Philadelphia (PHL)

Prices were available within the past 7 days and start at $69 for one-way flights and $133 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Dec 10 - Wed, Dec 11
ONT
Ontario
PHL
Philadelphia
$133 Roundtrip, found 1 day ago
$133
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Dec 10 from Ontario to Philadelphia, returning Wed, Dec 11, priced at $133 found 1 day ago
Frontier Airlines
Thu, Oct 31 - Wed, Nov 13
ONT
Ontario
PHL
Philadelphia
$138 Roundtrip, just found
$138
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 31 from Ontario to Philadelphia, returning Wed, Nov 13, priced at $138 just found
Frontier Airlines
Wed, Dec 11 - Thu, Dec 12
ONT
Ontario
PHL
Philadelphia
$153 Roundtrip, found 22 hours ago
$153
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Wed, Dec 11 from Ontario to Philadelphia, returning Thu, Dec 12, priced at $153 found 22 hours ago
Frontier Airlines
Fri, Dec 13 - Mon, Dec 16
ONT
Ontario
PHL
Philadelphia
$158 Roundtrip, just found
$158
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Dec 13 from Ontario to Philadelphia, returning Mon, Dec 16, priced at $158 just found
Frontier Airlines
Sat, Sep 21 - Wed, Oct 9
ONT
Ontario
PHL
Philadelphia
$164 Roundtrip, found 3 hours ago
$164
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Sep 21 from Ontario to Philadelphia, returning Wed, Oct 9, priced at $164 found 3 hours ago
Frontier Airlines
Mon, Dec 2 - Sat, Dec 7
ONT
Ontario
PHL
Philadelphia
$168 Roundtrip, found 5 hours ago
$168
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Mon, Dec 2 from Ontario to Philadelphia, returning Sat, Dec 7, priced at $168 found 5 hours ago
Frontier Airlines
Fri, Dec 13 - Mon, Dec 16
ONT
Ontario
PHL
Philadelphia
$178 Roundtrip, just found
$178
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Dec 13 from Ontario to Philadelphia, returning Mon, Dec 16, priced at $178 just found
Frontier Airlines
Mon, Dec 2 - Fri, Dec 13
ONT
Ontario
PHL
Philadelphia
$188 Roundtrip, found 5 hours ago
$188
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Mon, Dec 2 from Ontario to Philadelphia, returning Fri, Dec 13, priced at $188 found 5 hours ago
Frontier Airlines
Sat, Sep 21 - Sat, Sep 28
ONT
Ontario
PHL
Philadelphia
$190 Roundtrip, found 4 hours ago
$190
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, Sep 21 from Ontario to Philadelphia, returning Sat, Sep 28, priced at $190 found 4 hours ago
Frontier Airlines
Fri, Nov 8 - Sun, Nov 10
ONT
Ontario
PHL
Philadelphia
$198 Roundtrip, just found
$198
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Nov 8 from Ontario to Philadelphia, returning Sun, Nov 10, priced at $198 just found
Flight from Ontario to Philadelphia (ONT - PHL) route information
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Philadelphia Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, United
Roundtrip price
$132
Distance
2349 mi

Ontario to Philadelphia Flights

The cheapest times to fly from Ontario to Philadelphia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Philadelphia are during the month of December. You can find some of the cheapest flights from Ontario to Philadelphia with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Ontario to Philadelphia

Sunday is one of the best days to book for cheap flights from Ontario to Philadelphia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Ontario to Philadelphia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Philadelphia in 2024. You can also book with separate airlines for your outbound and return journeys, from $69 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Philadelphia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Philadelphia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much is a one-way flight from Ontario Airport to PHL?
You can nab one-way Ontario flights to Philadelphia starting from $69. This data is based on the lowest price located on Expedia for this journey with a departure date in the next three months and was updated on September 18 2024 and has not changed since. This fare is for an Frontier Airlines flight, leaving Los Angeles - Ontario Intl. Airport (ONT) on October 1 2024 and touching down at PHL.
How long does it take to fly from ONT to PHL?
Purchase a ticket with United Airlines and you can expect to be airborne for approximately 5 hours and 5 minutes. This sought-after airline has a direct flight that takes off at 9:00AM from ONT and reaches Philadelphia Airport at 5:05PM. Expedia has some great flight deals, so take a peek at what’s available on this route today.
Is it cheaper to buy a plane ticket from Ontario Airport to Philadelphia Intl. Airport (PHL) last minute?
Being a spontaneous soul is a fantastic way to discover the world, but it isn’t always the wisest way to score a bargain airfare. Consider booking your Los Angeles - Ontario Intl. Airport (ONT) to Philadelphia Intl. Airport (PHL) trip ahead of time instead of leaving it till the last minute. Based on flight pricing and demand studies in 2022, we have found that the best time to book domestic flights is between 28 – 35 days ahead of the departure date, and international flights three to four months in advance. Leave your spontaneity for when you get to Philadelphia Intl. Airport (PHL)!
What is the cheapest airline flying from Ontario Airport to Philadelphia Intl. Airport (PHL) in the next 90 days?
The cheapest airline traveling from Ontario to Philadelphia found on Expedia is Frontier Airlines, with fares starting at $69. This price is based on airfares found on Expedia with a departure date within the next 90 days. The flight leaves Los Angeles - Ontario Intl. Airport (ONT) on October 1 2024 and arrives at Philadelphia Intl. Airport (PHL). Pricing information was updated on September 18 2024 and has not changed since.
What's the cheapest price for a flight from Los Angeles - Ontario Intl. Airport (ONT) to Philadelphia Airport next month?
The cheapest ticket for a one-way flight from Ontario to Philadelphia within the next month is $69. If you’re planning to travel soon, lock in this fare before it’s gone. This price was found after looking at all available flights on Expedia with a departure date within the next 30 days. This airfare is for a one-way Frontier Airlines flight departing ONT on October 1 2024 and getting into PHL. The price was last updated on September 18 2024 and has not changed since.
What airports do you fly into for Philadelphia from Los Angeles?
From Los Angeles, you can get to Philadelphia via Philadelphia Intl. Airport (PHL), Atlantic City Intl. Airport (ACY) and Lehigh Valley Intl. Airport (ABE). It’s wise to check which terminal is the most convenient for you before making your decision. If you opt for Philadelphia Intl. Airport (PHL), it’s roughly 7 mi southwest of downtown. Use the dough you save when booking your fare with Expedia to visit the city’s awesome attractions, such as Liberty Bell Center and Independence Hall.
What are the most popular departure times for flights from Ontario Airport to Philadelphia Airport?
Between 9:00 AM - 10:00 AM is when you’ll find the largest number of United Airlines flights making their way from Los Angeles - Ontario Intl. Airport (ONT) to PHL. Our recommendation? Book a flight that departs earlier in the day. With air traffic yet to build up around airports, your chances of catching a delay-free flight are higher.
Can I change the date of my flight from Ontario Airport to PHL?
You can make changes to your Ontario Airport to Philadelphia Intl. Airport (PHL) flight through the Expedia Trips portal. But before you make any adjustments, review the conditions and rules in your itinerary to learn what the airline will allow you to do and if charges apply. Some airlines charge a change fee per person, on top of any difference in ticket prices. However, if you booked in the last 24 hours, you may be able to cancel for free and book new flights. You can also take a look at our Customer Service portal for more useful advice and to connect with our Virtual Agent.
Philadelphia nearby Airports

Atlantic City

Ontario to Atlantic City Intl.
$341.57
Ontario nearby Airports

Los Angeles

Los Angeles Intl. to Philadelphia
$69.00

Burbank

Hollywood Burbank to Philadelphia
$112.96

Orange County

John Wayne to Philadelphia
$137.95

Long Beach

Long Beach Municipal to Philadelphia
$295.36
*Available to One Key members.