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$72+ 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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Feb 6 — Feb 131
Fri 2/6
Fri 2/13
1 adult, Economy
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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 January 7, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$144
(Frontier)

One-way from

$72
(Frontier)

Popular in

December

Cheapest in

May

Average price

$446
Provider with most accurate pricing for Philadelphia-Ontario flight deals.
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Provider most trusted by Cheapflights users for Philadelphia-Ontario flights.
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From Philadelphia to Ontario
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One-way flight from Philadelphia to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($53 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 7, 2026.

This Frontier deal was found by Cheapflights users on 1/6. 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.
Mon 2/98:30 amPHL - ONT
1 stop8h 57mFrontier
Thu 2/266:05 amONT - PHL
1 stop7h 32mFrontier
Deal found 1/6$144
This CheapOair deal was found by Cheapflights users on 1/7. 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.
Thu 2/195:42 pmPHL - ONT
1 stop9h 17mFrontier
Thu 2/262:08 pmONT - PHL
1 stop24h 47mFrontier
Deal found 1/7$145
This Frontier deal was found by Cheapflights users on 1/6. 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.
Sun 2/88:20 amPHL - ONT
1 stop11h 06mFrontier
Thu 2/266:05 amONT - PHL
1 stop7h 32mFrontier
Deal found 1/6$177
This Frontier deal was found by Cheapflights users on 1/5. 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.
Mon 2/236:00 amPHL - ONT
1 stop11h 30mFrontier
Thu 2/266:05 amONT - PHL
1 stop7h 32mFrontier
Deal found 1/5$180
This Frontier deal was found by Cheapflights users on 1/5. 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.
Mon 2/98:30 amPHL - ONT
1 stop8h 57mFrontier
Thu 2/196:05 amONT - PHL
1 stop7h 32mFrontier
Deal found 1/5$201
This CheapOair deal was found by Cheapflights users on 1/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/266:00 amPHL - ONT
1 stop11h 29mFrontier
Mon 3/26:10 amONT - PHL
1 stop7h 27mFrontier
Deal found 1/4$202
This Frontier deal was found by Cheapflights users on 1/6. 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.
Sun 2/88:20 amPHL - ONT
1 stop11h 06mFrontier
Fri 2/276:00 amONT - PHL
1 stop8h 55mFrontier
Deal found 1/6$210
This Frontier deal was found by Cheapflights users on 1/6. 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.
Sun 2/88:20 amPHL - ONT
1 stop11h 06mFrontier
Thu 2/126:05 amONT - PHL
1 stop7h 32mFrontier
Deal found 1/6$215
This CheapOair deal was found by Cheapflights users on 1/6. 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 2/88:20 amPHL - ONT
1 stop11h 06mFrontier
Wed 2/118:10 amONT - PHL
1 stop29h 27mFrontier
Deal found 1/6$216
This Kiwi.com deal was found by Cheapflights users on 1/6. 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.
Mon 2/28:30 amPHL - ONT
1 stop8h 57mFrontier
Thu 2/56:20 amONT - PHL
2 stops34h 39mFrontier
Deal found 1/6$222
This Frontier deal was found by Cheapflights users on 1/5. 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.
Mon 2/98:30 amPHL - ONT
1 stop8h 57mFrontier
Mon 2/162:06 pmONT - PHL
1 stop7h 56mFrontier
Deal found 1/5$230
This CheapOair deal was found by Cheapflights users on 1/6. 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.
Thu 4/28:36 pmPHL - ONT
1 stop30h 23mFrontier
Thu 4/96:00 amONT - PHL
1 stop20h 31mFrontier
Deal found 1/6$231

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 January 7, 2026.
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

Wed 2/11

2:30 pm-9:05 pm

1 stop9h 35m

Ontario

Tue 2/24

1:10 pm-11:46 pm

1 stop7h 36m

$257

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 2/7

7:00 am-12:16 pm

1 stop8h 16m

Ontario

Wed 2/25

1:15 pm-12:24 am

1 stop8h 09m

$297

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 3/31

7:00 am-12:23 pm

1 stop8h 23m

Ontario

Wed 4/8

12:50 pm-12:57 am

1 stop9h 07m

$307

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 4/1

7:00 am-12:23 pm

1 stop8h 23m

Ontario

Wed 4/8

12:50 pm-12:57 am

1 stop9h 07m

$307

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 2/2

6:37 pm-11:58 pm

1 stop8h 21m

Ontario

Thu 2/5

12:41 pm-12:21 am

1 stop8h 40m

$307

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 2/25

12:16 pm-11:49 pm

2 stops14h 33m

Ontario

Sat 2/28

10:20 pm-9:32 am

1 stop8h 12m

$317

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 3/8

3:36 pm-9:04 pm

1 stop8h 28m

Ontario

Wed 3/18

5:09 pm-5:41 am

1 stop9h 32m

$343

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 3/10

6:22 pm-10:44 pm

1 stop31h 22m

Ontario

Wed 3/18

6:00 am-6:05 am

1 stop21h 05m

$345

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 1/29

7:06 pm-11:56 pm

1 stop31h 50m

Ontario

Sat 1/31

4:03 pm-6:03 pm

1 stop23h 00m

$345

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 1/27

5:40 am-11:31 am

1 stop8h 51m

Ontario

Mon 2/2

10:30 pm-9:24 am

1 stop7h 54m

$356

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 22 results
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2
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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 January.
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 January 2, 2026.

The best time to book flights from Philadelphia to Ontario is 30 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.

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 January 7, 2026.
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

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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
7.9
Good
8,025 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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
9,139 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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
11,095 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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
5.7
Fair
3,062 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Overall

8.0

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 $257, Delta can have you in Ontario from Philadelphia in 9h 35m. 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 Delta and United Airlines, starting at $208 and $305 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 American Airlines from $153 and Delta from $165 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 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 January 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$304FlexibilityNo cancel feeOn-time62%
DeltaCheapest$300Average$431FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$305Average$482FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$306Average$438FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$367Average$482FlexibilityNo cancel feeOn-time63%

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