HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$110+ Cheap flights from Philadelphia to Ontario (PHL - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Philadelphia to Ontario are usually found in September or March, booked 25 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap flight deals from Philadelphia to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 1, 2025.

Round-trip from

$165
(Priceline)

One-way from

$110
(Priceline)

Popular in

December

Cheapest in

September

Average price

$374
From Philadelphia to Ontario
Search Deals
One-way flight from Philadelphia to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Philadelphia to Ontario

Cheapest flights from Philadelphia to Ontario
Explore the most affordable flight options available from Philadelphia to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

This Priceline deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/127:19 amPHL - ONT
1 stop12h 01mFrontier
Sat 7/195:13 pmONT - PHL
1 stop9h 36mFrontier
Deal found 6/30$165

Cheapflights Fare Finder

Customize your flight search to find flights from Philadelphia to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 1, 2025.
Use the filters below to find and compare flights from Philadelphia to Ontario that are best for you.

Fly from

Philadelphia

Fly to

Ontario

Route

Depart

Return

Price

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 7/12

7:19 am-4:20 pm

1 stop12h 01m

Ontario

Sat 7/19

5:13 pm-5:49 am

1 stop9h 36m

$165

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 7/12

7:19 am-4:20 pm

1 stop12h 01m

$110

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 8/19

9:00 am-4:18 pm

1 stop10h 18m

$149

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 9/23

7:22 am-2:12 pm

1 stop9h 50m

$171

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 8/20

12:18 pm-7:11 pm

1 stop9h 53m

$172

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 8/12

6:00 am-11:32 am

2 stops8h 32m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Best time to book a flight from Philadelphia to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Philadelphia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Ontario

How far ahead should I book a flight from Philadelphia to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Ontario. Price data was last updated on June 27, 2025.

The best time to book flights from Philadelphia to Ontario is 25 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Philadelphia to Ontario?

Currently, August is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $246). Flying from Philadelphia to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PHL to ONT?

Find hourly flight availability from Philadelphia to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 1, 2025.

It’s typically best to fly out from Philadelphia to Ontario in the evening. Doing so could potentially save you 25% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from Philadelphia to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Philadelphia to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Philadelphia to Ontario flight should consider departing on Sunday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 1, 2025.
Read through reviews of airlines operating flights from Philadelphia to Ontario, such as Delta, Hawaiian Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,973 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Hawaiian Airlines
7.8
Good
2,539 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Frontier
5.9
Fair
3,291 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Philadelphia to Ontario round-trip?

    Our cheapest airline available from Philadelphia to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $165 on this airline. Users have found that Frontier is 56% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Philadelphia to Ontario one-way?

    One-way options have recently been found by users for as low as $110 on Frontier. Other airlines that offer cheap prices include Hawaiian Airlines from $171 and Delta from $172 one-way.

  • Can I find deals for flights from Philadelphia to Ontario that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Ontario.

  • Can I find deals for business class flights from Philadelphia to Ontario?

    Yes. Cheapflights offers flight deals from Philadelphia to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Philadelphia to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $246). Flying from Philadelphia to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Newark to Los Angeles flights
John F Kennedy Intl to San Francisco flights
Newark to San Francisco flights
Newark to Las Vegas flights
Dulles Intl to Los Angeles flights
LaGuardia to Los Angeles flights
Reagan-National to Los Angeles flights
Dulles Intl to Las Vegas flights
LaGuardia to Las Vegas flights
LaGuardia to San Francisco flights
John F Kennedy Intl to San Diego flights
John F Kennedy Intl to Ontario flights
Philadelphia to Las Vegas flights
Dulles Intl to San Francisco flights
Newark to Burbank flights
Newark to San Diego flights
Reagan-National to San Francisco flights
Newark to Santa Ana flights
Reagan-National to Las Vegas flights
Newark to Ontario flights
LaGuardia to Burbank flights
Philadelphia to Los Angeles flights
Newark to San Jose flights
Newark to Oakland flights
Philadelphia to San Francisco flights
LaGuardia to Santa Ana flights
Dulles Intl to San Diego flights
Dulles Intl to Ontario flights
LaGuardia to Ontario flights
Reagan-National to San Diego flights
LaGuardia to San Diego flights
John F Kennedy Intl to Santa Ana flights
John F Kennedy Intl to San Jose flights
Philadelphia to San Diego flights
LaGuardia to Oakland flights
Pittsburgh to Las Vegas flights
Reagan-National to Ontario flights
Dulles Intl to Sacramento flights
LaGuardia to San Jose flights
Reagan-National to Santa Ana flights
Newark to Sacramento flights
John F Kennedy Intl to Burbank flights
John F Kennedy Intl to Oakland flights
John F Kennedy Intl to Reno flights
Dulles Intl to Santa Ana flights
Pittsburgh to San Francisco flights
Dulles Intl to San Jose flights

Top 6 airlines flying from Philadelphia to Ontario

Discover the top 6 airlines that operate flights from Philadelphia to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$266FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$152Average$193FlexibilityNo cancel feeOn-time65%
DeltaCheapest$280Average$431FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$293Average$409FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$305Average$436FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$338Average$452FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.