HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$65+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ONT
dic. 12 — dic. 191
vie. 12/12
vie. 12/19
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Ontario 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

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Philadelphia to Ontario are usually found in March or May, booked 71 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 noviembre 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$130
(CheapOair)

One-way from

$65
(Frontier)

Popular in

November

Cheapest in

March

Average price

$486
Provider with most accurate pricing for Philadelphia-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Ontario flights.
Search Deals
From Philadelphia to Ontario
Search Deals
One-way flight from Philadelphia to Ontario
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($34 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

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 noviembre 12, 2025.

This CheapOair deal was found by Cheapflights users on 11/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/86:15 amPHL - ONT
1 stop13h 18mFrontier
lun. 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/10$130
This Booking.com deal was found by Cheapflights users on 11/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/156:15 amPHL - ONT
1 stop13h 18mFrontier
mié. 12/176:15 amONT - PHL
1 stop20h 25mFrontier
Deal found 11/11$131
This CheapOair deal was found by Cheapflights users on 11/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/128:36 pmPHL - ONT
1 stop20h 49mFrontier
lun. 12/153:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/10$134
This CheapOair deal was found by Cheapflights users on 11/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/86:15 amPHL - ONT
1 stop13h 18mFrontier
vie. 12/123:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/10$138
This Frontier deal was found by Cheapflights users on 11/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/259:06 amPHL - ONT
1 stop10h 15mFrontier
vie. 12/53:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/10$141
This CheapOair deal was found by Cheapflights users on 11/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/58:36 pmPHL - ONT
1 stop20h 49mFrontier
vie. 12/123:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/10$142
This Expedia deal was found by Cheapflights users on 11/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/187:10 amPHL - ONT
1 stop17h 07mFrontier
jue. 12/256:45 amONT - PHL
1 stop19h 46mFrontier
Deal found 11/12$144
This Priceline deal was found by Cheapflights users on 11/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/276:00 amPHL - ONT
1 stop8h 11mFrontier
vie. 12/53:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/11$145
This Super.com deal was found by Cheapflights users on 11/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/58:36 pmPHL - ONT
1 stop20h 49mFrontier
lun. 12/83:20 pmONT - PHL
1 stop11h 11mFrontier
Deal found 11/11$152
This CheapOair deal was found by Cheapflights users on 11/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/206:00 amPHL - ONT
1 stop20h 57mFrontier
lun. 11/2412:58 amONT - PHL
1 stop24h 47mFrontier
Deal found 11/10$183

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 noviembre 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

lun. 12/8

5:17 pm-11:58 pm

2 stops9h 41m

Ontario

mié. 12/10

6:00 am-5:40 pm

1 stop8h 40m

$332

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

sáb. 12/6

5:30 am-11:02 am

1 stop8h 32m

Ontario

mar. 12/9

12:12 pm-12:51 am

1 stop9h 39m

$337

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

mié. 12/10

5:30 am-11:02 am

1 stop8h 32m

Ontario

lun. 12/15

12:12 pm-12:51 am

1 stop9h 39m

$337

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

sáb. 12/6

5:30 am-11:02 am

1 stop8h 32m

Ontario

sáb. 12/13

12:12 pm-12:36 am

1 stop9h 24m

$338

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

jue. 12/11

6:18 am-5:07 pm

2 stops13h 49m

Ontario

jue. 12/18

7:05 am-6:12 pm

1 stop8h 07m

$352

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

vie. 12/5

7:06 am-11:29 pm

1 stop19h 23m

Ontario

dom. 12/7

6:00 am-5:53 pm

1 stop8h 53m

$354

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

sáb. 12/6

6:54 pm-11:29 pm

1 stop31h 35m

Ontario

mar. 12/9

6:00 am-5:53 pm

1 stop8h 53m

$354

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

vie. 12/12

12:22 pm-10:47 pm

2 stops13h 25m

Ontario

dom. 12/14

5:49 pm-10:51 am

2 stops14h 02m

$366

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

mié. 12/3

6:54 pm-11:29 pm

1 stop31h 35m

Ontario

vie. 12/5

7:33 pm-5:46 am

1 stop31h 13m

$375

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

sáb. 12/6

7:06 am-6:33 pm

1 stop14h 27m

Ontario

dom. 12/7

6:00 am-5:53 pm

1 stop8h 53m

$375

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 23 results
1
2
3

Compare providers for flights from Philadelphia to Ontario

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 Philadelphia to Ontario in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*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 Philadelphia-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Philadelphia-Ontario flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Philadelphia-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Ontario 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 Philadelphia-Ontario 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 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 November 7, 2025.

The best time to book flights from Philadelphia to Ontario is 71 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, May is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $88). Flying from Philadelphia to Ontario in October is currently the most expensive (average of $142). 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 noviembre 12, 2025.

It’s typically best to fly out from Philadelphia to Ontario in the evening. Doing so could potentially save you 24% 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 Wednesday 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.

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 noviembre 12, 2025.
Read through reviews of airlines operating flights from Philadelphia to Ontario, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,235 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Boarding

8.1

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Boarding

8.1

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
7.9
Good
8,009 reviews
Southwest
8.0
Very good
4,235 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Boarding

8.1

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
9,015 reviews
Southwest
8.0
Very good
4,235 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Boarding

8.1

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
11,049 reviews
Southwest
8.0
Very good
4,235 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Boarding

8.1

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
3,114 reviews
Southwest
8.0
Very good
4,235 reviews

Comfort

8.0

Crew

8.6

Entertainment

7.5

Food

7.0

Boarding

8.1

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 Philadelphia to Ontario. 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 Philadelphia to Ontario?

    For as low as $332, Delta can have you in Ontario from Philadelphia in 9h 41m. Airlines will cover a distance of 2349 mi.

  • 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 $130 on this airline. Additional options worth looking into are Spirit Airlines and United Airlines, starting at $166 and $305 round-trip. Users have found that Frontier is 68% 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 $75 on Frontier. Other airlines that offer cheap prices include Delta from $159 and United Airlines from $159 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, May is the cheapest month in which you can book a flight from Philadelphia to Ontario (average of $88). Flying from Philadelphia to Ontario in October is currently the most expensive (average of $142). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
Newark to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Newark to Las Vegas flights
Newark to San Francisco flights
LaGuardia to Los Angeles flights
LaGuardia to Las Vegas flights
Dulles Intl to Las Vegas flights
Reagan-National to Los Angeles flights
John F Kennedy Intl to San Diego flights
Dulles Intl to Los Angeles flights
LaGuardia to San Francisco flights
Reagan-National to Las Vegas flights
Philadelphia to Las Vegas flights
Reagan-National to San Francisco flights
Newark to San Diego flights
Newark to Ontario flights
LaGuardia to Burbank flights
Dulles Intl to San Francisco flights
Philadelphia to Los Angeles flights
John F Kennedy Intl to Ontario flights
LaGuardia to Santa Ana flights
John F Kennedy Intl to Santa Ana flights
Philadelphia to San Francisco flights
Dulles Intl to San Diego flights
LaGuardia to Ontario flights
LaGuardia to San Diego flights
Pittsburgh to Las Vegas flights
Newark to Santa Ana flights
Reagan-National to San Diego flights
Dulles Intl to Ontario flights
John F Kennedy Intl to Palm Springs flights
Reagan-National to Ontario flights
Newark to San Jose flights
John F Kennedy Intl to San Jose flights
Philadelphia to San Diego flights
Newark to Palm Springs flights
John F Kennedy Intl to Reno flights
John F Kennedy Intl to Burbank flights
Newark to Sacramento flights
Reagan-National to Santa Ana flights
Newark to Burbank flights
Dulles Intl to San Jose flights
LaGuardia to Palm Springs flights
Dulles Intl to Santa Ana flights
Newark to Oakland flights
Dulles Intl to Reno flights
John F Kennedy Intl to Oakland flights

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 noviembre 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$130Average$298FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$166Average$218FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$305Average$436FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$434FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$307Average$437FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$367Average$468FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.