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$135+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Ontario are usually found in September or March, booked 25 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 June 12, 2025.

Round-trip from

$236
(Cheapflightsfares)

One-way from

$135
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$425
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. 12% potential increase in price ($52 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 June 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 June 12, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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.
Mon 8/117:19 amPHL - ONT
1 stop7h 34mFrontier
Fri 8/157:22 pmONT - PHL
1 stop7h 27mFrontier
Deal found 6/11$236
This Delta deal was found by Cheapflights users on 6/12. 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.
Mon 8/46:55 pmPHL - ONT
1 stop7h 47mDelta
Tue 8/1211:45 amONT - PHL
1 stop7h 35mDelta
Deal found 6/12$297
This Alaska Airlines deal was found by Cheapflights users on 6/11. 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 11/47:00 amPHL - ONT
1 stop11h 14mAlaska Airlines
Fri 11/144:09 pmONT - PHL
1 stop10h 31mAlaska Airlines
Deal found 6/11$332
This Southwest deal was found by Cheapflights users on 6/11. 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.
Tue 7/14:45 pmPHL - ONT
1 stop8h 30mSouthwest
Tue 7/89:35 pmONT - PHL
2 stops8h 40mSouthwest
Deal found 6/11$368
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Mon 9/295:06 pmPHL - ONT
1 stop8h 24mUnited Airlines
Tue 9/306:36 pmONT - PHL
1 stop7h 50mUnited Airlines
Deal found 6/10$392

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 June 12, 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 8/11

7:19 am-11:53 am

1 stop7h 34m

Ontario

Fri 8/15

7:22 pm-5:49 am

1 stop7h 27m

$236

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 8/4

6:55 pm-11:42 pm

1 stop7h 47m

Ontario

Tue 8/12

11:45 am-10:20 pm

1 stop7h 35m

$297

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 11/4

7:00 am-3:14 pm

1 stop11h 14m

Ontario

Fri 11/14

4:09 pm-5:40 am

1 stop10h 31m

$332

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 7/1

4:45 pm-10:15 pm

1 stop8h 30m

Ontario

Tue 7/8

9:35 pm-9:15 am

2 stops8h 40m

$368

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 9/29

5:06 pm-10:30 pm

1 stop8h 24m

Ontario

Tue 9/30

6:36 pm-5:26 am

1 stop7h 50m

$392

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 8/29

7:15 am-11:49 am

1 stop7h 34m

$135

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 8/4

6:22 pm-4:20 pm

1 stop24h 58m

$138

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 9/30

7:20 am-2:09 pm

1 stop9h 49m

$148

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 8/4

6:55 pm-11:42 pm

1 stop7h 47m

$149

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 7/8

6:45 am-1:27 pm

1 stop9h 42m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 June 9, 2025.

The best time to book flights from Philadelphia to Ontario is 25 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 June 12, 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 June 12, 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
10,000 reviews

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

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

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

Overall

8.0

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 $236 on this airline. Additional options worth looking into are Delta and Alaska Airlines, starting at $297 and $332 round-trip. Users have found that Frontier is 37% 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 $135 on Frontier. Other airlines that offer cheap prices include Hawaiian Airlines from $148 and Delta from $149 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$131Average$264FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$152Average$193FlexibilityNo cancel feeOn-time65%
DeltaCheapest$280Average$423FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$280Average$393FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$338Average$456FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$371Average$436FlexibilityNo cancel feeOn-time69%

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