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$82+ 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 11/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Philadelphia are usually found in September or May, booked 56 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 agosto 14, 2025.

Round-trip from

$164
(CheapOair)

One-way from

$82
(CheapOair)

Popular in

January

Cheapest in

September

Average price

$371
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 ($46 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 August 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 agosto 14, 2025.

This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/312:59 amONT - PHL
1 stop20h 58mFrontier
sáb. 9/66:45 amPHL - ONT
1 stop27h 38mFrontier
Deal found 8/14$164
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/312:59 amONT - PHL
1 stop20h 58mFrontier
sáb. 9/136:45 amPHL - ONT
1 stop16h 09mFrontier
Deal found 8/14$165
This Booking.com deal was found by Cheapflights users on 8/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/312:59 amONT - PHL
1 stop20h 58mFrontier
dom. 9/78:10 amPHL - ONT
1 stop13h 05mFrontier
Deal found 8/13$166
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/286:00 amONT - PHL
1 stop20h 45mFrontier
lun. 9/86:45 amPHL - ONT
1 stop16h 09mFrontier
Deal found 8/14$172
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/18:59 pmONT - PHL
1 stop24h 58mFrontier
mié. 10/88:15 amPHL - ONT
1 stop26h 14mFrontier
Deal found 8/14$185
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/212:59 amONT - PHL
1 stop24h 55mFrontier
lun. 9/86:45 amPHL - ONT
1 stop16h 09mFrontier
Deal found 8/14$186
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/77:15 pmONT - PHL
1 stop18h 17mFrontier
jue. 9/118:10 amPHL - ONT
1 stop10h 19mFrontier
Deal found 8/14$188
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/212:59 amONT - PHL
1 stop24h 55mFrontier
sáb. 9/66:45 amPHL - ONT
1 stop27h 38mFrontier
Deal found 8/14$192
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/258:59 pmONT - PHL
1 stop24h 58mFrontier
lun. 10/276:42 amPHL - ONT
1 stop20h 08mFrontier
Deal found 8/14$195
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/258:24 amONT - PHL
1 stop29h 17mFrontier
dom. 11/24:43 pmPHL - ONT
1 stop19h 36mFrontier
Deal found 8/14$199
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/66:53 amONT - PHL
2 stops15h 01mFrontier
lun. 11/106:19 amPHL - ONT
1 stop7h 51mFrontier
Deal found 8/14$200

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 agosto 14, 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

mié. 9/3

12:59 am-12:57 am

1 stop20h 58m

Philadelphia

sáb. 9/6

6:45 am-7:23 am

1 stop27h 38m

$164

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 11/6

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

lun. 11/10

6:19 am-11:50 pm

1 stop20h 31m

$164

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 9/18

8:59 pm-12:57 am

1 stop24h 58m

Philadelphia

jue. 9/25

6:45 am-7:54 pm

1 stop16h 09m

$164

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 9/4

8:59 pm-12:57 am

1 stop24h 58m

Philadelphia

lun. 9/8

6:45 am-7:54 pm

1 stop16h 09m

$164

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 9/4

8:59 pm-12:57 am

1 stop24h 58m

Philadelphia

jue. 9/11

8:10 am-3:29 pm

1 stop10h 19m

$165

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 9/4

8:59 pm-12:57 am

1 stop24h 58m

Philadelphia

sáb. 9/13

6:45 am-7:54 pm

1 stop16h 09m

$165

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

jue. 11/6

12:05 pm-4:49 am

1 stop13h 44m

Philadelphia

dom. 11/9

10:48 pm-7:29 am

1 stop11h 41m

$165

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

mié. 9/3

12:59 am-12:57 am

1 stop20h 58m

Philadelphia

dom. 9/7

8:10 am-3:24 pm

1 stop10h 14m

$165

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

vie. 11/14

4:05 pm-4:49 am

1 stop9h 44m

$82

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

vie. 10/31

4:05 pm-4:49 am

1 stop9h 44m

$82

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 19 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 August 8, 2025.

The best time to book flights from Ontario to Philadelphia is 21 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 agosto 14, 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.

How much does it cost to fly round-trip from Ontario to Philadelphia?

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

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

Las Vegas (LAS) – chosen by Cheapflights users on 71% of 1-stop itineraries from Ontario to Philadelphia on Cheapflights.

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

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

Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $159.

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

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

Flights via Las Vegas (LAS) have the shortest average one-way travel time for 1-stop routes: 12h 21m.

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

Average layover duration for 1-stop one-way flights from Ontario to Philadelphia, 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 5h 03m.

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 agosto 14, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Ontario to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

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
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

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
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

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
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

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
5.8
Fair
3,217 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

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

    Cheapflights users have booked flights from Ontario to Philadelphia round-trip from $88. Other airlines that can offer you cheap pricing are Frontier, from $138, and Delta, from $324. Spirit Airlines is 78% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 Philadelphia?

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

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Alternative routes for Ontario to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
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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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$88Average$160FlexibilityNo cancel feeOn-time65%
FrontierCheapest$138Average$242FlexibilityNo cancel feeOn-time62%
DeltaCheapest$324Average$408FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$325Average$445FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$361Average$503FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$407Average$496FlexibilityNo cancel feeOn-time69%

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