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$84+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Apr 27 — May 41
Sun 4/27
Sun 5/4
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 September or April, booked 53 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 April 22, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$176
(Cheapflightsfares)

One-way from

$84
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$298
Provider with most accurate pricing for Philadelphia-Ontario flight deals.
Search Deals
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. 14% potential increase in price ($61 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 22, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/287:10 amPHL - ONT
1 stop7h 33mFrontier
Tue 6/36:42 pmONT - PHL
1 stop7h 28mFrontier
Deal found 4/22$176
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/26:38 amPHL - ONT
1 stop7h 19mDelta
Sat 8/307:00 amONT - PHL
1 stop7h 17mDelta
Deal found 4/21$307
This United Airlines deal was found by Cheapflights users on 4/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/78:31 amPHL - ONT
2 stops12h 08mUnited Airlines
Sat 6/146:34 pmONT - PHL
1 stop7h 48mUnited Airlines
Deal found 4/22$352
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/157:05 amPHL - ONT
1 stop10h 01mAlaska Airlines
Thu 9/183:00 pmONT - PHL
1 stop11h 45mAlaska Airlines
Deal found 4/22$356
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/125:00 amPHL - ONT
1 stop8h 04mAmerican Airlines
Mon 6/167:02 pmONT - PHL
1 stop7h 48mAmerican Airlines
Deal found 4/21$398
This Southwest deal was found by Cheapflights users on 4/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/94:45 pmPHL - ONT
2 stops8h 55mSouthwest
Fri 7/1812:55 pmONT - PHL
2 stops8h 20mSouthwest
Deal found 4/22$400
This Hawaiian Airlines deal was found by Cheapflights users on 4/22. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:25 amPHL - ONT
1 stop10h 47mHawaiian Airlines
Thu 11/134:05 pmONT - PHL
1 stop10h 56mHawaiian Airlines
Deal found 4/22$416

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, 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 5/24

7:10 am-4:20 pm

1 stop12h 10m

Ontario

Sat 5/31

5:21 pm-5:07 am

1 stop8h 46m

$178

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 7/2

6:38 am-10:57 am

1 stop7h 19m

Ontario

Sat 8/30

7:00 am-5:17 pm

1 stop7h 17m

$307

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 6/7

8:00 am-12:31 pm

1 stop7h 31m

Ontario

Wed 6/11

6:32 pm-9:39 am

2 stops12h 07m

$352

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 9/15

7:05 am-2:06 pm

1 stop10h 01m

Ontario

Thu 9/18

3:00 pm-5:45 am

1 stop11h 45m

$356

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 6/12

5:00 am-10:04 am

1 stop8h 04m

Ontario

Mon 6/16

7:02 pm-5:50 am

1 stop7h 48m

$398

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 6/12

7:10 pm-11:55 pm

1 stop7h 45m

Ontario

Mon 6/16

11:15 am-12:15 am

2 stops10h 00m

$403

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 4/29

6:45 pm-9:53 am

1 stop18h 08m

$84

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 6/17

6:20 pm-9:51 pm

1 stop30h 31m

$134

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 7/22

2:01 pm-6:08 pm

1 stop7h 07m

$174

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 6/5

4:20 pm-11:10 pm

2 stops9h 50m

$195

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/21

Showing 1-10 of 14 results
1
2

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*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars

*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 Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Philadelphia-Ontario flight deals on Cheapflights vs. Mytrip >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 Mytrip the most. Mytrip 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 18, 2025.

The best time to book flights from Philadelphia to Ontario is 53 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 April 22, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Philadelphia to Ontario to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,906 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,906 reviews
Alaska Airlines
8.0
Very good
9,906 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,286 reviews
Alaska Airlines
8.0
Very good
9,906 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,920 reviews
Alaska Airlines
8.0
Very good
9,906 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Hawaiian Airlines
7.9
Good
2,392 reviews
Alaska Airlines
8.0
Very good
9,906 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,683 reviews
Alaska Airlines
8.0
Very good
9,906 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 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 $176 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at $306 and $307 round-trip. Users have found that Frontier is 52% 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 $84 on Frontier. Other airlines that offer cheap prices include Southwest from $195 and United Airlines from $209 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

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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 April 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$131Average$264FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$152Average$193FlexibilityNo cancel feeOn-time65%
DeltaCheapest$280Average$406FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$280Average$399FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$338Average$457FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$357Average$409FlexibilityNo cancel feeOn-time69%

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