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$90+ 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 12/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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Find cheap flights from Ontario to Philadelphia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Ontario to Philadelphia are usually found in February or May, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

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 November 26, 2025.

This Frontier deal was found by Cheapflights users on 11/25. 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.
Mon 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Thu 1/17:10 amPHL - ONT
1 stop13h 12mFrontier
Deal found 11/25$183
This Frontier deal was found by Cheapflights users on 11/25. 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.
Wed 12/246:00 pmONT - PHL
1 stop8h 40mFrontier
Thu 1/17:10 amPHL - ONT
1 stop13h 12mFrontier
Deal found 11/25$184
This CheapOair deal was found by Cheapflights users on 11/26. 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.
Fri 12/53:20 pmONT - PHL
1 stop11h 11mFrontier
Mon 1/58:36 pmPHL - ONT
1 stop28h 36mFrontier
Deal found 11/26$207
This CheapOair deal was found by Cheapflights users on 11/26. 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.
Fri 12/53:20 pmONT - PHL
1 stop11h 11mFrontier
Sat 1/310:01 pmPHL - ONT
1 stop12h 23mFrontier
Deal found 11/26$208
This Kiwi.com deal was found by Cheapflights users on 11/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:15 amONT - PHL
2 stops26h 02mMultiple Airlines
Sun 1/188:53 amPHL - ONT
1 stop13h 08mMultiple Airlines
Deal found 11/24$218
This Frontier deal was found by Cheapflights users on 11/25. 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.
Mon 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Sat 12/2710:01 pmPHL - ONT
1 stop12h 23mFrontier
Deal found 11/25$227
This Frontier deal was found by Cheapflights users on 11/24. 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.
Wed 12/246:00 pmONT - PHL
1 stop8h 40mFrontier
Sat 12/2710:01 pmPHL - ONT
1 stop12h 23mFrontier
Deal found 11/24$228
This CheapOair deal was found by Cheapflights users on 11/26. 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.
Fri 12/53:20 pmONT - PHL
1 stop11h 11mFrontier
Sun 12/78:36 pmPHL - ONT
1 stop20h 49mFrontier
Deal found 11/26$232
This CheapOair deal was found by Cheapflights users on 11/26. 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.
Mon 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Mon 12/228:36 pmPHL - ONT
1 stop30h 23mFrontier
Deal found 11/26$233
This Frontier deal was found by Cheapflights users on 11/23. 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.
Thu 12/186:17 pmONT - PHL
1 stop8h 23mFrontier
Thu 1/17:10 amPHL - ONT
1 stop13h 12mFrontier
Deal found 11/23$234
This Frontier deal was found by Cheapflights users on 11/25. 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.
Fri 12/195:54 pmONT - PHL
1 stop8h 46mFrontier
Thu 1/17:10 amPHL - ONT
1 stop13h 12mFrontier
Deal found 11/25$238
This CheapOair deal was found by Cheapflights users on 11/24. 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.
Fri 12/123:20 pmONT - PHL
1 stop11h 11mFrontier
Sun 1/184:14 pmPHL - ONT
1 stop25h 09mFrontier
Deal found 11/24$242

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 November 26, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$182
(Frontier)

One-way from

$90
(Super.com)

Popular in

October

Cheapest in

February

Average price

$457
Provider with most accurate pricing for Ontario-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Philadelphia flights.
Search Deals
From Ontario to Philadelphia
Search Deals
One-way flight from Ontario to Philadelphia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 26, 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

Mon 1/19

10:30 pm-9:23 am

1 stop7h 53m

Philadelphia

Thu 1/29

5:40 am-11:31 am

1 stop8h 51m

$307

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 1/21

1:10 pm-11:53 pm

1 stop7h 43m

Philadelphia

Wed 1/28

5:40 am-11:31 am

1 stop8h 51m

$307

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 1/21

10:30 pm-9:23 am

1 stop7h 53m

Philadelphia

Sat 1/24

5:40 am-11:31 am

1 stop8h 51m

$307

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 1/20

10:30 pm-9:23 am

1 stop7h 53m

Philadelphia

Thu 1/29

5:40 am-11:31 am

1 stop8h 51m

$307

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 1/24

10:30 pm-11:11 am

1 stop9h 41m

Philadelphia

Thu 1/29

5:40 am-11:31 am

1 stop8h 51m

$307

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 1/17

1:24 pm-11:30 pm

1 stop7h 06m

Philadelphia

Sat 1/24

8:09 am-12:47 pm

1 stop7h 38m

$342

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 2/24

4:02 pm-5:20 pm

1 stop22h 18m

Philadelphia

Fri 2/27

6:20 pm-11:32 pm

1 stop32h 12m

$364

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 1/23

4:03 pm-6:03 pm

1 stop23h 00m

Philadelphia

Mon 1/26

7:06 pm-3:08 pm

1 stop23h 02m

$365

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 1/30

4:03 pm-6:03 pm

1 stop23h 00m

Philadelphia

Mon 2/2

7:06 pm-3:08 pm

1 stop23h 02m

$365

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 2/23

10:20 pm-9:27 am

1 stop8h 07m

$154

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

Showing 1-10 of 20 results
1
2

Compare providers for flights from Ontario to Philadelphia

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 Ontario to Philadelphia in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
GotogatePrice Accuracy3 starsTrust 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 Ontario-Philadelphia flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Philadelphia flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Philadelphia flights, Cheapflights users trust CheapOair the most. CheapOair 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 Ontario-Philadelphia 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 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 November 21, 2025.

The best time to book flights from Ontario to Philadelphia is 69 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, June is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $78). Flying from Ontario to Philadelphia in October is currently the most expensive (average of $136). 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 November 26, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 28% 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.

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 November 26, 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
4,254 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
4,254 reviews
Southwest
8.0
Very good
4,254 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
7.9
Good
8,004 reviews
Southwest
8.0
Very good
4,254 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
9,050 reviews
Southwest
8.0
Very good
4,254 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
11,037 reviews
Southwest
8.0
Very good
4,254 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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
3,101 reviews
Southwest
8.0
Very good
4,254 reviews

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

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.

  • How long is the flight from Ontario to Philadelphia?

    There are many flights that can get you from Ontario to Philadelphia in 7h 53m. Fly via Delta to get the fastest option. Ontario and Philadelphia are separated by a distance of 2349 mi.

  • 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 $140, and Delta, from $296. 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, June is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $78). Flying from Ontario to Philadelphia in October is currently the most expensive (average of $136). 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
Wildwood
King of Prussia
Pottstown
Reading
Ocean City
Cherry Hill
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Newark
Millville
Chester
Exton

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Alternative routes for Ontario to Philadelphia

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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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$88Average$160FlexibilityNo cancel feeOn-time65%
FrontierCheapest$140Average$243FlexibilityNo cancel feeOn-time62%
DeltaCheapest$296Average$414FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$302Average$450FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$342Average$560FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$358Average$496FlexibilityNo cancel feeOn-time63%

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