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$96+ 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Ontario are usually found in September or March, booked 88 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 September 15, 2025.

Round-trip from

$164
(Mytrip)

One-way from

$96
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$324
From Philadelphia to Ontario
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One-way flight from Philadelphia to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 15, 2025.

This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:19 amPHL - ONT
1 stop20h 31mFrontier
Sun 11/25:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 9/14$164
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:42 amPHL - ONT
1 stop20h 08mFrontier
Fri 10/316:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 9/13$165
This Frontier deal was found by Cheapflights users on 9/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/46:45 amPHL - ONT
1 stop16h 09mFrontier
Fri 10/108:34 amONT - PHL
1 stop14h 07mFrontier
Deal found 9/13$176
This Gotogate deal was found by Cheapflights users on 9/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:10 amPHL - ONT
1 stop10h 19mFrontier
Thu 10/28:59 pmONT - PHL
1 stop24h 58mFrontier
Deal found 9/14$179
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:10 amPHL - ONT
1 stop10h 19mFrontier
Wed 10/18:59 pmONT - PHL
1 stop24h 58mFrontier
Deal found 9/14$180
This CheapOair deal was found by Cheapflights users on 9/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/146:19 amPHL - ONT
1 stop7h 51mFrontier
Sun 11/166:53 amONT - PHL
1 stop18h 56mFrontier
Deal found 9/14$184
This CheapOair deal was found by Cheapflights users on 9/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:45 amPHL - ONT
1 stop16h 09mFrontier
Sun 10/57:15 pmONT - PHL
1 stop18h 17mFrontier
Deal found 9/13$185
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:10 amPHL - ONT
1 stop10h 19mFrontier
Thu 9/258:59 pmONT - PHL
1 stop24h 58mFrontier
Deal found 9/13$196
This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:45 amPHL - ONT
1 stop16h 09mFrontier
Fri 10/108:34 amONT - PHL
1 stop14h 07mFrontier
Deal found 9/14$198
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/288:10 amPHL - ONT
1 stop10h 14mFrontier
Thu 10/28:59 pmONT - PHL
1 stop24h 58mFrontier
Deal found 9/13$200
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:15 amPHL - ONT
1 stop10h 17mFrontier
Thu 10/307:39 amONT - PHL
2 stops14h 20mFrontier
Deal found 9/14$203

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 September 15, 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

Fri 10/3

6:45 am-7:54 pm

1 stop16h 09m

Ontario

Fri 10/10

8:34 am-1:41 am

1 stop14h 07m

$198

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 10/7

5:02 pm-10:22 pm

1 stop8h 20m

Ontario

Sat 10/11

6:00 am-5:38 pm

1 stop8h 38m

$327

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 12/16

5:30 am-10:40 am

1 stop8h 10m

Ontario

Thu 1/8

10:30 pm-9:27 am

1 stop7h 57m

$334

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 12/13

7:05 am-12:22 pm

1 stop8h 17m

Ontario

Wed 1/7

10:30 pm-9:27 am

1 stop7h 57m

$334

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 12/3

5:30 am-10:40 am

1 stop8h 10m

Ontario

Sat 12/6

11:45 am-9:24 pm

1 stop6h 39m

$334

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 12/6

7:05 am-12:22 pm

1 stop8h 17m

Ontario

Wed 12/10

6:00 am-5:40 pm

1 stop8h 40m

$334

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 10/28

7:02 am-3:17 pm

1 stop11h 15m

Ontario

Tue 11/4

6:00 am-6:12 pm

1 stop9h 12m

$336

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 12/4

6:15 am-5:08 pm

2 stops13h 53m

Ontario

Mon 12/8

10:25 pm-11:31 am

1 stop10h 06m

$356

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 3/1

5:55 am-11:38 am

1 stop8h 43m

Ontario

Tue 3/3

1:00 pm-11:26 pm

1 stop7h 26m

$368

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 11/5

7:02 am-3:17 pm

1 stop11h 15m

Ontario

Sun 11/9

6:00 am-6:12 pm

1 stop9h 12m

$374

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 21 results
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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 September 12, 2025.

The best time to book flights from Philadelphia to Ontario is 87 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 September 15, 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 September 15, 2025.
Read through reviews of airlines operating flights from Philadelphia to Ontario, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • How long is the flight from Philadelphia to Ontario?

    For as low as $327, Frontier can have you in Ontario from Philadelphia in 8h 20m. Airlines will cover a distance of 2349 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying 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 $130 on this airline. Additional options worth looking into are Spirit Airlines and United Airlines, starting at $166 and $305 round-trip. Users have found that Frontier is 67% cheaper than the other options available to this destination.

  • 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

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Alternative routes for Philadelphia to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$264FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$166Average$218FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$305Average$436FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$431FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$313Average$420FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$367Average$466FlexibilityNo cancel feeOn-time63%

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