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$65+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Find cheap flights from Philadelphia to Ontario with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Philadelphia to Ontario are usually found in March or May, booked 71 days in advance, depart on a Monday or Wednesday and return on a Tuesday

Cheap 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 December 4, 2025.

This CheapOair deal was found by Cheapflights users on 12/3. 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.
Mon 12/156:15 amPHL - ONT
1 stop13h 18mFrontier
Wed 12/176:15 amONT - PHL
1 stop20h 25mFrontier
Deal found 12/3$204
This CheapOair deal was found by Cheapflights users on 12/2. 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.
Sun 12/148:36 pmPHL - ONT
1 stop20h 49mFrontier
Wed 12/176:15 amONT - PHL
1 stop20h 25mFrontier
Deal found 12/2$208
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:32 pmPHL - ONT
2 stops45h 38mFrontier
Wed 12/176:15 amONT - PHL
1 stop20h 25mFrontier
Deal found 12/1$214
This Trip.com deal was found by Cheapflights users on 12/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/148:36 pmPHL - ONT
1 stop20h 49mFrontier
Sun 1/116:00 amONT - PHL
1 stop26h 46mFrontier
Deal found 12/4$226
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/126:15 amPHL - ONT
1 stop13h 18mFrontier
Thu 12/186:17 pmONT - PHL
1 stop8h 23mFrontier
Deal found 12/2$233
This Mytrip deal was found by Cheapflights users on 12/2. 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 12/128:36 pmPHL - ONT
1 stop20h 49mFrontier
Mon 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 12/2$237
This CheapOair deal was found by Cheapflights users on 12/2. 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 12/128:36 pmPHL - ONT
1 stop20h 49mFrontier
Mon 1/198:32 amONT - PHL
1 stop13h 49mFrontier
Deal found 12/2$248
This Mytrip deal was found by Cheapflights users on 12/2. 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.
Sun 12/148:36 pmPHL - ONT
1 stop20h 49mFrontier
Sun 12/216:00 amONT - PHL
1 stop20h 40mFrontier
Deal found 12/2$252
This CheapOair deal was found by Cheapflights users on 12/3. 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.
Mon 12/86:15 amPHL - ONT
1 stop13h 18mFrontier
Mon 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 12/3$255
This Priceline deal was found by Cheapflights users on 12/2. 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.
Mon 12/86:15 amPHL - ONT
1 stop13h 18mFrontier
Thu 12/186:17 pmONT - PHL
1 stop8h 23mFrontier
Deal found 12/2$258

Find 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 December 4, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$166
(CheapOair)

One-way from

$65
(Trip.com)

Popular in

November

Cheapest in

March

Average price

$481
Provider with most accurate pricing for Philadelphia-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Ontario flights.
Search Deals
From Philadelphia to Ontario
Search Deals
One-way flight from Philadelphia to Ontario
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 4, 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

Mon 2/2

6:37 pm-11:58 pm

1 stop8h 21m

Ontario

Mon 2/23

10:20 pm-9:27 am

1 stop8h 07m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 1/13

2:31 pm-9:05 pm

1 stop9h 34m

Ontario

Tue 1/20

12:41 pm-12:21 am

1 stop8h 40m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 1/31

2:30 pm-9:05 pm

1 stop9h 35m

Ontario

Mon 2/23

10:20 pm-9:27 am

1 stop8h 07m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 1/10

5:40 am-11:31 am

1 stop8h 51m

Ontario

Sat 1/17

12:41 pm-12:21 am

1 stop8h 40m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 2/2

6:37 pm-11:58 pm

1 stop8h 21m

Ontario

Thu 2/26

1:10 pm-11:46 pm

1 stop7h 36m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 2/4

5:40 am-11:31 am

1 stop8h 51m

Ontario

Thu 2/26

1:10 pm-11:46 pm

1 stop7h 36m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 1/13

5:40 am-11:31 am

1 stop8h 51m

Ontario

Thu 1/22

10:30 pm-9:23 am

1 stop7h 53m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 1/21

5:40 am-11:31 am

1 stop8h 51m

Ontario

Mon 1/26

5:10 pm-9:50 am

2 stops13h 40m

$262

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 2/6

6:37 pm-11:58 pm

1 stop8h 21m

Ontario

Wed 2/25

1:10 pm-11:46 pm

1 stop7h 36m

$273

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 2/4

6:37 pm-11:58 pm

1 stop8h 21m

Ontario

Fri 2/20

10:20 pm-9:23 am

1 stop8h 03m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 22 results
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Compare providers for flights from Philadelphia to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Ontario in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Philadelphia-Ontario flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Philadelphia-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Ontario flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 November 28, 2025.

The best time to book flights from Philadelphia to Ontario is 71 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, December is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $84). Flying from Philadelphia to Ontario in July is currently the most expensive (average of $141). 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 December 4, 2025.

It’s typically best to fly out from Philadelphia to Ontario in the evening. Doing so could potentially save you 24% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 December 4, 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
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

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
4,250 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

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
7.9
Good
8,011 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

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
9,066 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

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
11,047 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

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
3,091 reviews
Southwest
8.0
Very good
4,250 reviews

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

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 $257, Delta can have you in Ontario from Philadelphia in 8h 21m. Airlines will cover a distance of 2349 mi.

  • 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 Delta, starting at $166 and $208 round-trip. Users have found that Frontier is 68% 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 $72 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $75 and American Airlines from $153 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, December is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $84). Flying from Philadelphia to Ontario in July is currently the most expensive (average of $141). 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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$294FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$166Average$215FlexibilityNo cancel feeOn-time65%
DeltaCheapest$300Average$431FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$305Average$442FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$306Average$435FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$367Average$472FlexibilityNo cancel feeOn-time63%

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