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

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

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

Las Vegas (LAS) – chosen by Cheapflights users on 63% of 1-stop itineraries from Ontario to Philadelphia on Cheapflights.

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

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?

Flights via Dallas (DFW) offer the fastest connection on this route, with an average layover time of 5h 03m.

How long is the flight from Ontario to Philadelphia?

There are many flights that can get you from Ontario to Philadelphia in 7h 42m. 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 $41. Other airlines that can offer you cheap pricing are Frontier, from $140, and Delta, from $296. Spirit Airlines is 89% 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 $72. However, be on the lookout for offers from American Airlines and Delta, as they are both options that can get you from Ontario to Philadelphia for a low price.

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.

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).

What are the most popular airlines that fly from Ontario to Philadelphia?

Before booking your flight from Ontario to Philadelphia check out the most popular airlines for this route: American Airlines, Frontier or Delta.

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.

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.

$92+ Flights from Ontario to Philadelphia

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

Airfare is below average for this route at the moment. Ontario to Philadelphia flights typically cost between $393 and $531 in January. The cheapest round-trip price found within the last 3 days was $182 on Frontier (Jan 8-Jan 15).

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1. Tell us where you want to go

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Cheap 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 December 28, 2025.

Sun 12/288:19 amONT - PHL

1 stop14h 05mFrontier

Mon 1/58:36 pmPHL - ONT

1 stop28h 36mFrontier

Deal found 12/26

$374

Wed 12/316:00 pmONT - PHL

1 stop8h 40mFrontier

Sat 1/310:01 pmPHL - ONT

1 stop12h 23mFrontier

Deal found 12/25

$407

Fri 12/266:45 amONT - PHL

1 stop19h 46mFrontier

Fri 1/27:10 amPHL - ONT

1 stop17h 07mFrontier

Deal found 12/25

$408

Mon 12/298:14 amONT - PHL

1 stop14h 10mFrontier

Wed 12/317:10 amPHL - ONT

1 stop13h 05mFrontier

Deal found 12/25

$482

Mon 12/296:00 pmONT - PHL

1 stop8h 40mFrontier

Sat 1/310:01 pmPHL - ONT

1 stop12h 23mFrontier

Deal found 12/26

$497

Tue 12/306:17 pmONT - PHL

1 stop8h 23mFrontier

Thu 1/86:01 pmPHL - ONT

2 stops23h 53mFrontier

Deal found 12/26

$549

Mon 12/296:00 pmONT - PHL

1 stop8h 40mFrontier

Thu 1/81:00 pmPHL - ONT

2 stops21h 36mFrontier

Deal found 12/26

$596

Sun 12/286:37 pmONT - PHL

1 stop8h 03mFrontier

Thu 1/89:00 amPHL - ONT

2 stops25h 36mFrontier

Deal found 12/26

$635

Sat 12/275:16 pmONT - PHL

1 stop9h 24mFrontier

Thu 1/81:00 pmPHL - ONT

2 stops21h 36mFrontier

Deal found 12/26

$636

Best flights from Ontario to Philadelphia
Discover carefully curated flight deals from Ontario to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 28, 2025.

Sun 1/181:11 pmONT - PHL

1 stop7h 42mDelta

Tue 1/272:30 pmPHL - ONT

1 stop9h 35mDelta

Deal found 12/26

$319

Thu 1/294:03 pmONT - PHL

1 stop23h 00mAlaska Airlines

Sun 2/17:06 pmPHL - ONT

1 stop18h 53mAlaska Airlines

Deal found 12/26

$364

Sun 1/181:11 pmONT - PHL

1 stop7h 42mDelta

Thu 1/295:40 amPHL - ONT

1 stop8h 51mDelta

Deal found 12/26

$319

Tue 1/2010:30 pmONT - PHL

1 stop7h 53mDelta

Thu 1/295:40 amPHL - ONT

1 stop8h 51mDelta

Deal found 12/26

$319

Tue 1/274:03 pmONT - PHL

1 stop23h 00mAlaska Airlines

Sat 1/317:06 pmPHL - ONT

1 stop18h 53mAlaska Airlines

Deal found 12/27

$364

Tue 1/201:11 pmONT - PHL

1 stop7h 42mDelta

Tue 1/277:00 amPHL - ONT

1 stop8h 16mDelta

Deal found 12/26

$319

Wed 1/2110:30 pmONT - PHL

1 stop9h 41mDelta

Sat 1/312:30 pmPHL - ONT

1 stop9h 35mDelta

Deal found 12/26

$337

Sat 1/246:00 amONT - PHL

1 stop8h 36mDelta

Tue 1/275:40 amPHL - ONT

1 stop8h 51mDelta

Deal found 12/26

$337

Wed 1/2110:30 pmONT - PHL

1 stop9h 41mDelta

Mon 1/266:37 pmPHL - ONT

1 stop8h 21mDelta

Deal found 12/26

$337

Mon 1/1910:30 pmONT - PHL

1 stop9h 41mDelta

Sat 1/315:40 amPHL - ONT

1 stop8h 51mDelta

Deal found 12/26

$337

Sat 1/2410:30 pmONT - PHL

1 stop9h 41mDelta

Thu 1/295:40 amPHL - ONT

1 stop8h 51mDelta

Deal found 12/26

$337

Sun 1/181:11 pmONT - PHL

1 stop7h 42mDelta

Fri 1/302:30 pmPHL - ONT

1 stop9h 35mDelta

Deal found 12/26

$365

Last-minute flights from Ontario to Philadelphia
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated December 28, 2025 and is based on user searches.

Sun 1/46:37 pmONT - PHL

1 stop8h 03mFrontier

Mon 1/121:05 pmPHL - ONT

1 stop13h 51mFrontier

Deal found 12/26

$267

Mon 1/56:00 pmONT - PHL

1 stop8h 40mFrontier

Mon 1/121:05 pmPHL - ONT

1 stop13h 51mFrontier

Deal found 12/26

$203

Mon 1/56:00 pmONT - PHL

1 stop8h 40mFrontier

Fri 1/912:51 pmPHL - ONT

1 stop14h 05mFrontier

Deal found 12/26

$288

Thu 1/88:31 amONT - PHL

1 stop12h 57mFrontier

Thu 1/156:18 amPHL - ONT

1 stop10h 30mFrontier

Deal found 12/25

$182

Thu 1/88:31 amONT - PHL

1 stop12h 57mFrontier

Fri 1/912:51 pmPHL - ONT

1 stop14h 05mFrontier

Deal found 12/27

$328

Fri 1/98:31 amONT - PHL

1 stop12h 57mFrontier

Mon 1/121:05 pmPHL - ONT

1 stop13h 51mFrontier

Deal found 12/25

$217

Mon 1/128:31 amONT - PHL

1 stop12h 57mMultiple Airlines

Tue 1/201:40 pmPHL - ONT

2 stops27h 32mMultiple Airlines

Deal found 12/27

$244

Fri 1/168:32 amONT - PHL

1 stop13h 49mFrontier

Mon 1/195:42 pmPHL - ONT

1 stop24h 25mFrontier

Deal found 12/26

$237

Fri 1/168:32 amONT - PHL

1 stop13h 49mFrontier

Sun 1/188:53 amPHL - ONT

1 stop13h 08mFrontier

Deal found 12/26

$252

Sun 1/181:11 pmONT - PHL

1 stop7h 42mDelta

Tue 1/272:30 pmPHL - ONT

1 stop9h 35mDelta

Deal found 12/26

$319

Mon 1/198:32 amONT - PHL

1 stop13h 49mFrontier

Mon 1/268:30 amPHL - ONT

1 stop8h 57mFrontier

Deal found 12/26

$251

Tue 1/2010:30 pmONT - PHL

2 stops10h 13mDelta

Thu 1/225:40 amPHL - ONT

1 stop8h 51mDelta

Deal found 12/26

$324

One-way flights from Ontario to Philadelphia
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated December 28, 2025.

Thu 2/266:05 amONT - PHL

1 stop7h 32mFrontier

Deal found 12/26

$92

Thu 1/88:31 amONT - PHL

1 stop12h 57mFrontier

Deal found 12/25

$93

Mon 1/56:00 pmONT - PHL

1 stop8h 40mFrontier

Deal found 12/26

$113

Mon 1/266:20 amONT - PHL

2 stops49h 54mFrontier

Deal found 12/26

$115

Mon 1/198:32 amONT - PHL

1 stop13h 49mFrontier

Deal found 12/28

$116

Wed 3/48:40 amONT - PHL

1 stop28h 57mFrontier

Deal found 12/27

$117

Wed 2/258:40 amONT - PHL

1 stop28h 57mFrontier

Deal found 12/26

$119

Fri 2/276:00 amONT - PHL

1 stop8h 55mFrontier

Deal found 12/26

$126

Wed 1/283:07 pmONT - PHL

3 stops53h 52mMultiple Airlines

Deal found 12/27

$129

Fri 1/98:31 amONT - PHL

1 stop12h 57mFrontier

Deal found 12/26

$132

Find flight deals from Ontario to Philadelphia

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$182 (Frontier)
One-way from	$92 (CheapOair)
Popular in	October
Cheapest in	February
Average price	$476

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. 4% potential increase in price ($20 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sun 1/18

1:11 pm-11:53 pm

1 stop7h 42m

Philadelphia

Tue 1/27

2:30 pm-9:05 pm

1 stop9h 35m

$319

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sun 1/18

1:11 pm-11:53 pm

1 stop7h 42m

Philadelphia

Thu 1/29

5:40 am-11:31 am

1 stop8h 51m

$319

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

$319

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 1/20

1:11 pm-11:53 pm

1 stop7h 42m

Philadelphia

Tue 1/27

7:00 am-12:16 pm

1 stop8h 16m

$319

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 1/21

10:30 pm-11:11 am

1 stop9h 41m

Philadelphia

Sat 1/31

2:30 pm-9:05 pm

1 stop9h 35m

$337

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 1/24

6:00 am-5:36 pm

1 stop8h 36m

Philadelphia

Tue 1/27

5:40 am-11:31 am

1 stop8h 51m

$337

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 1/21

10:30 pm-11:11 am

1 stop9h 41m

Philadelphia

Mon 1/26

6:37 pm-11:58 pm

1 stop8h 21m

$337

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 1/19

10:30 pm-11:11 am

1 stop9h 41m

Philadelphia

Sat 1/31

5:40 am-11:31 am

1 stop8h 51m

$337

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

$337

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 1/29

4:03 pm-6:03 pm

1 stop23h 00m

Philadelphia

Sun 2/1

7:06 pm-10:59 am

1 stop18h 53m

$364

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

Showing 1-10 of 23 results

Compare providers for flights from Ontario to Philadelphia

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Philadelphia in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Cheapfaremart	Price Accuracy-	Trust Score*1 star
JustAirTicket	Price Accuracy-	Trust Score*1 star
Gotogate	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust 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

Prices

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

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?

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?

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?

Reviews of airlines servicing Philadelphia

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

4,256 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Southwest

8.0

Very good

4,256 reviews

Southwest

8.0

Very good

4,256 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Delta

7.9

Good

8,019 reviews

Southwest

8.0

Very good

4,256 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

United Airlines

7.4

Good

9,113 reviews

Southwest

8.0

Very good

4,256 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

American Airlines

7.2

Good

11,072 reviews

Southwest

8.0

Very good

4,256 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Frontier

5.8

Fair

3,065 reviews

Southwest

8.0

Very good

4,256 reviews

Reviews

1 / 20

10.0

Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

How long is the flight from Ontario to Philadelphia?
There are many flights that can get you from Ontario to Philadelphia in 7h 42m. 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 $41. Other airlines that can offer you cheap pricing are Frontier, from $140, and Delta, from $296. Spirit Airlines is 89% 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 $72. However, be on the lookout for offers from American Airlines and Delta, 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, 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

Wildwood

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Ocean City

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Lewes

Dewey Beach

Ephrata

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Dover

Elkton

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Willow Grove

New Castle

Millville

Newark

Chester

Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from Ontario to Philadelphia

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$88	Average$154	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$151	Average$241	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$296	Average$411	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$302	Average$458	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$342	Average$472	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$358	Average$494	FlexibilityNo cancel fee	On-time63%

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$92+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Philadelphia with Cheapflights

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Cheap flight deals from Ontario to Philadelphia

Cheapest flights from Ontario to PhiladelphiaExplore 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 December 28, 2025.

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 December 28, 2025.

Find flight deals from Ontario to Philadelphia

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Philadelphia that are best for you.

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 December.

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.

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?

What is the cheapest month to book a flight from Ontario to Philadelphia?

What is the cheapest time of day to fly from ONT to PHL?

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

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?

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

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

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

Reviews of airlines servicing Philadelphia

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.

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?

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

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

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

How can I find direct flights from Ontario to Philadelphia?

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

What is the cheapest month to book a flight from Ontario to Philadelphia?

Traveling to a place near Philadelphia?

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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.

Top 6 airlines flying from Ontario to Philadelphia

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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 December 28, 2025.