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$130+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Ontario are usually found in September or March, booked 87 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 July 30, 2025.

Round-trip from

$256
(Gotogate)

One-way from

$130
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$411
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. 6% potential increase in price ($28 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 July 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 July 30, 2025.

This Gotogate deal was found by Cheapflights users on 7/30. 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.
Sat 8/308:00 amPHL - ONT
1 stop26h 33mFrontier
Sat 9/68:59 pmONT - PHL
1 stop24h 58mFrontier
Deal found 7/30$256
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 11/47:02 amPHL - ONT
1 stop11h 15mAlaska Airlines
Tue 11/184:11 pmONT - PHL
1 stop10h 31mAlaska Airlines
Deal found 7/28$324
This Delta deal was found by Cheapflights users on 7/28. 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 12/246:00 amPHL - ONT
1 stop7h 38mDelta
Wed 1/77:00 amONT - PHL
1 stop7h 11mDelta
Deal found 7/28$325
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Wed 8/276:00 amPHL - ONT
2 stops8h 32mAmerican Airlines
Wed 9/31:10 pmONT - PHL
2 stops9h 00mAmerican Airlines
Deal found 7/29$335
This Southwest deal was found by Cheapflights users on 7/29. 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.
Thu 12/44:55 pmPHL - ONT
1 stop8h 10mSouthwest
Tue 12/95:45 amONT - PHL
2 stops8h 30mSouthwest
Deal found 7/29$336

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 July 30, 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 8/30

8:00 am-7:33 am

1 stop26h 33m

Ontario

Sat 9/6

8:59 pm-12:57 am

1 stop24h 58m

$256

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 11/4

7:02 am-3:17 pm

1 stop11h 15m

Ontario

Tue 11/18

4:11 pm-5:42 am

1 stop10h 31m

$324

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 12/24

6:00 am-10:38 am

1 stop7h 38m

Ontario

Wed 1/7

7:00 am-5:11 pm

1 stop7h 11m

$325

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 8/27

6:00 am-11:32 am

2 stops8h 32m

Ontario

Wed 9/3

1:10 pm-1:10 am

2 stops9h 00m

$335

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 12/4

4:55 pm-10:05 pm

1 stop8h 10m

Ontario

Tue 12/9

5:45 am-5:15 pm

2 stops8h 30m

$336

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 12/5

7:25 am-3:12 pm

1 stop10h 47m

Ontario

Tue 12/9

4:05 pm-6:01 am

1 stop10h 56m

$350

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 10/11

6:19 am-11:50 pm

1 stop20h 31m

$130

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 9/16

7:22 am-2:12 pm

1 stop9h 50m

$162

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 8/19

7:00 am-12:14 pm

1 stop8h 14m

$163

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 1/20

10:45 am-5:53 pm

2 stops10h 08m

$179

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 13 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 July 25, 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 July 30, 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.

What’s the top layover airport for flights from Philadelphia to Ontario?

Share of 1-stop round-trip flights from Philadelphia to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.

Dallas (DFW) – chosen by Cheapflights users on 50% of 1-stop itineraries from Philadelphia to Ontario on Cheapflights.

What’s the cheapest layover airport for flights from Philadelphia to Ontario?

Average round-trip fare for 1-stop flights from Philadelphia to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Dallas (DFW) is the most affordable 1-stop option, with an average round-trip price of $128.

What’s the fastest layover option from Philadelphia to Ontario?

Shortest average travel time for 1-stop one-way flights from Philadelphia to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Dallas (DFW) have the shortest average one-way travel time for 1-stop routes: 12h 07m.

Which airport typically offers the quickest layover for flights from Philadelphia to Ontario?

Average layover duration for 1-stop one-way flights from Philadelphia to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Dallas (DFW) offer the fastest connection on this route, with an average layover time of 4h 21m.

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 July 30, 2025.
Read through reviews of airlines operating flights from Philadelphia to Ontario, such as Alaska Airlines, Southwest, and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 $256 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at $324 and $325 round-trip. Users have found that Frontier is 34% 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 $130 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $162 and Delta from $163 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$264FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$152Average$193FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$305Average$436FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$426FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$326Average$415FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$338Average$452FlexibilityNo cancel feeOn-time63%

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