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$100+ Cheap flights from Ontario to Philadelphia (ONT - PHL)

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 6/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Jun 21 — Jun 281
Sat 6/21
Sat 6/28
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Philadelphia are usually found in August or September, booked 39 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from Ontario to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Philadelphia (PHL). 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 16, 2025.

Round-trip from

$198
(Cheapflightsfares)

One-way from

$100
(Frontier)

Popular in

January

Cheapest in

August

Average price

$411
From Ontario to Philadelphia
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One-way flight from Ontario to Philadelphia
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Highest demand for flights based on searches. 10% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 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 Ontario to Philadelphia

Cheapest flights from Ontario to Philadelphia
Explore the most affordable flight options available from Ontario to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/16. 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 6/257:36 pmONT - PHL
1 stop7h 13mFrontier
Fri 6/277:19 amPHL - ONT
1 stop7h 33mFrontier
Deal found 6/16$198
This Delta deal was found by Cheapflights users on 6/14. 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.
Thu 9/185:05 pmONT - PHL
1 stop9h 41mDelta
Tue 9/232:40 pmPHL - ONT
1 stop8h 02mDelta
Deal found 6/14$337
This American Airlines deal was found by Cheapflights users on 6/16. 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.
Sat 10/410:20 amONT - PHL
2 stops8h 53mAmerican Airlines
Sun 10/56:38 amPHL - ONT
1 stop8h 18mAmerican Airlines
Deal found 6/16$373
This Orbitz deal was found by Cheapflights users on 6/14. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/27:36 pmONT - PHL
1 stop7h 13mMultiple Airlines
Tue 7/86:45 amPHL - ONT
1 stop11h 01mMultiple Airlines
Deal found 6/14$374
This Southwest deal was found by Cheapflights users on 6/13. 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.
Sun 8/172:05 pmONT - PHL
1 stop7h 25mSouthwest
Thu 8/214:25 pmPHL - ONT
2 stops8h 35mSouthwest
Deal found 6/13$382
This United Airlines deal was found by Cheapflights users on 6/14. 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.
Thu 8/286:38 pmONT - PHL
1 stop7h 57mUnited Airlines
Tue 9/26:30 amPHL - ONT
2 stops9h 02mUnited Airlines
Deal found 6/14$392
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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.
Wed 8/137:30 amONT - PHL
2 stops18h 55mAlaska Airlines
Tue 8/196:45 amPHL - ONT
1 stop11h 01mAlaska Airlines
Deal found 6/16$405

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Philadelphia 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 16, 2025.
Use the filters below to find and compare flights from Ontario to Philadelphia that are best for you.

Fly from

Ontario

Fly to

Philadelphia

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 6/27

7:36 pm-5:49 am

1 stop7h 13m

Philadelphia

Mon 6/30

7:19 am-11:52 am

1 stop7h 33m

$198

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 9/18

5:05 pm-5:46 am

1 stop9h 41m

Philadelphia

Tue 9/23

2:40 pm-7:42 pm

1 stop8h 02m

$337

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 10/4

10:20 am-10:13 pm

2 stops8h 53m

Philadelphia

Sun 10/5

6:38 am-11:56 am

1 stop8h 18m

$373

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 7/2

7:36 pm-5:49 am

1 stop7h 13m

Philadelphia

Tue 7/8

6:45 am-2:46 pm

1 stop11h 01m

$374

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sun 8/17

2:05 pm-12:30 am

1 stop7h 25m

Philadelphia

Thu 8/21

4:25 pm-10:00 pm

2 stops8h 35m

$382

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 8/28

6:38 pm-5:35 am

1 stop7h 57m

Philadelphia

Tue 9/2

6:30 am-12:32 pm

2 stops9h 02m

$392

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 8/13

12:00 pm-5:25 am

1 stop14h 25m

Philadelphia

Tue 8/19

6:45 am-2:46 pm

1 stop11h 01m

$399

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 6/25

7:36 pm-5:49 am

1 stop7h 13m

$100

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 8/13

7:00 am-11:59 pm

1 stop13h 59m

$138

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 8/18

10:00 pm-11:13 am

1 stop10h 13m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 14 results
1
2

Best time to book a flight from Ontario to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Ontario 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 Ontario to Philadelphia

How far ahead should I book a flight from Ontario to Philadelphia?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Philadelphia. Price data was last updated on June 13, 2025.

The best time to book flights from Ontario to Philadelphia is 39 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 Ontario to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $236). Flying from Ontario to Philadelphia in March is currently the most expensive (average of $295). 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 ONT to PHL?

Find hourly flight availability from Ontario to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 16, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 29% on flights from Ontario to Philadelphia by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Ontario to Philadelphia?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Philadelphia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Philadelphia flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Ontario to Philadelphia

Explore weekly flight availability from Ontario to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 16, 2025.

The most flights from ONT to PHL are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Philadelphia by month

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

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

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

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July 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 January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated June 16, 2025.
Read through reviews of airlines operating flights from Ontario to Philadelphia, such as Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
4,283 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
7,963 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
2,501 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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
8,797 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Comfort

7.8

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 Ontario to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Ontario to Philadelphia?

    You will need to book a flight from Ontario to Philadelphia if you want to fly from Ontario to Philadelphia. At least 6 different airlines have flights from Ontario (ONT) to Philadelphia (PHL) on a regular basis. There is 1 flight to Philadelphia from the Ontario airport per day. If you manage to book one that is nonstop, then you can expect the flight time from ONT to PHL to be around 7h 09m.

  • What are the cheapest airlines flying from Ontario to Philadelphia round-trip?

    Cheapflights users have booked flights from Ontario to Philadelphia round-trip from $198. Other airlines that can offer you cheap pricing are Delta, from $337, and American Airlines, from $373. Frontier is 51% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Ontario to Philadelphia one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $100. However, be on the lookout for offers from Delta and Hawaiian Airlines, as they are both options that can get you from Ontario to Philadelphia for a low price.

  • Can I find deals for flights from Ontario to Philadelphia that include hotel bookings?

    Yes. In addition to deals on Ontario to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Philadelphia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Philadelphia.

  • Can I find deals for business class flights from Ontario to Philadelphia?

    Yes. Cheapflights offers flight deals from Ontario to Philadelphia 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 Ontario to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $236). Flying from Ontario to Philadelphia in March is currently the most expensive (average of $295). 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

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Vineland
Wildwood
Pottstown
King of Prussia
Cherry Hill
Exton
Ocean City
Chester
Essington
Reading
Newark
Middletown
Millville
Ephrata
Camden
Dover
Elkton
Willow Grove
Glen Mills
Springfield

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Top 6 airlines flying from Ontario to Philadelphia

Discover the top 6 airlines that operate flights from Ontario to Philadelphia. 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$88Average$218FlexibilityNo cancel feeOn-time65%
FrontierCheapest$140Average$240FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$319Average$457FlexibilityNo cancel feeOn-time71%
DeltaCheapest$319Average$414FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$342Average$472FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$361Average$509FlexibilityNo cancel feeOn-time63%

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