Ontario

$66+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
May 22 — May 291
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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 April 22, 2026.

This Frontier deal was found by Cheapflights users on 4/17. 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 5/238:35 pm
PHL
-
ONT
1 stop16h 30m
Frontier
Sat 5/306:00 am
ONT
-
PHL
1 stop20h 37m
Frontier
Deal found 4/17$226
This Frontier deal was found by Cheapflights users on 4/21. 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.
Fri 6/1911:06 am
PHL
-
ONT
1 stop11h 45m
Frontier
Wed 6/243:34 pm
ONT
-
PHL
1 stop11h 53m
Frontier
Deal found 4/21$290
This Booking.com deal was found by Cheapflights users on 4/21. 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.
Mon 5/48:41 pm
PHL
-
ONT
1 stop16h 24m
Frontier
Mon 5/116:00 am
ONT
-
PHL
1 stop20h 37m
Frontier
Deal found 4/21$294
This Trip.com deal was found by Cheapflights users on 4/20. 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.
Thu 4/306:43 am
PHL
-
ONT
1 stop16h 42m
Frontier
Wed 5/1310:50 am
ONT
-
PHL
1 stop15h 47m
Frontier
Deal found 4/20$296
This CheapOair deal was found by Cheapflights users on 4/21. 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.
Wed 5/1312:17 pm
PHL
-
ONT
1 stop9h 54m
Frontier
Sun 5/176:00 am
ONT
-
PHL
1 stop20h 37m
Frontier
Deal found 4/21$297
This Frontier deal was found by Cheapflights users on 4/21. 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.
Fri 4/243:22 pm
PHL
-
ONT
1 stop11h 36m
Frontier
Thu 5/283:30 pm
ONT
-
PHL
1 stop11h 51m
Frontier
Deal found 4/21$300
This CheapOair deal was found by Cheapflights users on 4/21. 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 5/178:35 pm
PHL
-
ONT
1 stop16h 30m
Frontier
Wed 5/2010:50 am
ONT
-
PHL
1 stop15h 47m
Frontier
Deal found 4/21$301
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1911:50 am
PHL
-
ONT
2 stops9h 34m
American Airlines
Sat 5/2312:41 pm
ONT
-
PHL
1 stop8h 55m
American Airlines
Deal found 4/17$303
This Booking.com deal was found by Cheapflights users on 4/19. 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.
Tue 5/128:35 pm
PHL
-
ONT
1 stop30h 14m
Frontier
Fri 8/215:43 pm
ONT
-
PHL
1 stop18h 24m
Frontier
Deal found 4/19$304
This Frontier deal was found by Cheapflights users on 4/20. 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.
Fri 4/243:22 pm
PHL
-
ONT
1 stop11h 36m
Frontier
Sun 4/265:12 pm
ONT
-
PHL
1 stop9h 22m
Frontier
Deal found 4/20$305
This Delta deal was found by Cheapflights users on 4/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/75:09 pm
PHL
-
ONT
1 stop7h 35m
Delta
Tue 8/115:55 pm
ONT
-
PHL
1 stop9h 10m
Delta
Deal found 4/20$306
This American Airlines deal was found by Cheapflights users on 4/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:00 am
PHL
-
ONT
2 stops9h 34m
American Airlines
Tue 5/1912:19 pm
ONT
-
PHL
2 stops8h 40m
American Airlines
Deal found 4/20$307

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 April 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$290
(Frontier)

One-way from

$66
(Trip.com)

Popular in

March

Cheapest in

May

Average price

$415
Provider with most accurate pricing for Philadelphia-Ontario flight deals.
Provider most trusted by Cheapflights users for Philadelphia-Ontario flights.
From Philadelphia to Ontario
One-way flight from Philadelphia to Ontario
Highest demand for flights based on searches. 1% potential increase in price ($6 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Average for round-trip flights in April 2026

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 April 22, 2026.
Use the filters below to find and compare flights from Philadelphia to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 8/7

6:55 pm-11:44 pm

1 stop7h 49m

Ontario

Thu 8/13

12:00 pm-10:20 pm

1 stop7h 20m

$334

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 8/23

7:00 am-12:29 pm

1 stop8h 29m

Ontario

Sun 8/30

12:00 pm-10:20 pm

1 stop7h 20m

$349

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 8/7

6:55 pm-11:44 pm

1 stop7h 49m

Ontario

Wed 8/12

12:00 pm-10:20 pm

1 stop7h 20m

$377

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 7/8

5:15 am-11:30 am

2 stops9h 15m

Ontario

Mon 7/27

12:45 pm-12:40 am

2 stops8h 55m

$380

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 8/16

7:00 am-12:29 pm

1 stop8h 29m

Ontario

Thu 8/20

5:05 pm-5:43 am

1 stop9h 38m

$380

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 5/29

10:32 am-8:42 pm

2 stops13h 10m

Ontario

Mon 6/1

6:30 pm-9:45 am

2 stops12h 15m

$384

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 7/2

5:16 am-10:40 am

1 stop8h 24m

Ontario

Thu 7/2

5:59 pm-5:45 am

1 stop8h 46m

$391
Quickest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 6/11

5:00 am-9:05 am

1 stop7h 05m

Ontario

Mon 6/15

2:30 pm-12:40 am

1 stop7h 10m

$399

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 8/2

7:30 am-12:08 pm

1 stop7h 38m

Ontario

Sun 8/9

10:00 pm-11:01 am

1 stop10h 01m

$423

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 5/22

5:17 am-10:57 am

1 stop8h 40m

Ontario

Wed 5/27

5:50 pm-5:37 am

1 stop8h 47m

$428

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/19

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 April 17, 2026.

The best time to book flights from Philadelphia to Ontario is 73 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, May is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $355). Flying from Philadelphia to Ontario in March is currently the most expensive (average of $492). 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.

How much does it cost to fly round-trip from Philadelphia to Ontario?

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 April 22, 2026.
Read through reviews of airlines operating flights from Philadelphia to Ontario, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 $334, Delta can have you in Ontario from Philadelphia in 7h 49m. 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 $155 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $208 and $305 round-trip. Users have found that Frontier is 63% 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 American Airlines from $139 and Southwest from $148 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, May is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $355). Flying from Philadelphia to Ontario in March is currently the most expensive (average of $492). 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.

Top 5 airlines flying from Philadelphia to Ontario

Discover the top 5 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 April 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$155Average$322FlexibilityNo cancel feeOn-time62%
DeltaCheapest$208Average$478FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$305Average$486FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$305Average$461FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$374Average$496FlexibilityNo cancel feeOn-time63%

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