HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Philadelphia

$89+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Apr 20 — Apr 271
Sun 4/20
Sun 4/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

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 Ontario to Philadelphia are usually found in August or September, booked 14 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 April 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$180
(CheapOair)

One-way from

$89
(Frontier)

Popular in

January

Cheapest in

August

Average price

$342
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. 11% potential increase in price ($52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 15, 2025.

This CheapOair deal was found by Cheapflights users on 4/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/71:08 pmONT - PHL
1 stop14h 44mFrontier
Wed 5/216:54 pmPHL - ONT
1 stop24h 37mFrontier
Deal found 4/13$180
This Delta deal was found by Cheapflights users on 4/14. 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.
Wed 5/146:00 amONT - PHL
1 stop8h 38mDelta
Tue 5/205:30 amPHL - ONT
1 stop8h 38mDelta
Deal found 4/14$307
This Alaska Airlines deal was found by Cheapflights users on 4/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/811:39 amONT - PHL
1 stop15h 06mAlaska Airlines
Tue 9/167:05 amPHL - ONT
1 stop10h 01mAlaska Airlines
Deal found 4/13$342
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2310:28 pmONT - PHL
1 stop9h 09mAmerican Airlines
Tue 8/121:45 pmPHL - ONT
1 stop9h 02mAmerican Airlines
Deal found 4/14$343
This Hawaiian Airlines deal was found by Cheapflights users on 4/13. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/303:00 pmONT - PHL
1 stop11h 45mHawaiian Airlines
Wed 10/87:25 amPHL - ONT
1 stop10h 47mHawaiian Airlines
Deal found 4/13$370
This Southwest deal was found by Cheapflights users on 4/13. 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.
Wed 7/239:35 pmONT - PHL
2 stops8h 50mSouthwest
Tue 8/123:20 pmPHL - ONT
1 stop7h 15mSouthwest
Deal found 4/13$376
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Sun 5/257:00 amONT - PHL
1 stop7h 31mUnited Airlines
Wed 5/2810:35 amPHL - ONT
2 stops13h 35mUnited Airlines
Deal found 4/14$412

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 April 15, 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

Wed 5/7

1:08 pm-6:52 am

1 stop14h 44m

Philadelphia

Wed 5/21

6:54 pm-4:31 pm

1 stop24h 37m

$180

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 5/14

6:00 am-5:38 pm

1 stop8h 38m

Philadelphia

Tue 5/20

5:30 am-11:08 am

1 stop8h 38m

$307

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 9/8

11:39 am-5:45 am

1 stop15h 06m

Philadelphia

Tue 9/16

7:05 am-2:06 pm

1 stop10h 01m

$342

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 7/23

10:28 pm-10:37 am

1 stop9h 09m

Philadelphia

Tue 8/12

1:45 pm-7:47 pm

1 stop9h 02m

$343

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 9/30

3:00 pm-5:45 am

1 stop11h 45m

Philadelphia

Wed 10/8

7:25 am-3:12 pm

1 stop10h 47m

$370

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 7/23

9:35 pm-9:25 am

2 stops8h 50m

Philadelphia

Tue 8/12

3:20 pm-7:35 pm

1 stop7h 15m

$376

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sun 5/25

7:00 am-5:31 pm

1 stop7h 31m

Philadelphia

Wed 5/28

10:35 am-9:10 pm

2 stops13h 35m

$412

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 5/24

5:15 pm-5:38 am

1 stop9h 23m

$89

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 5/2

4:29 pm-5:44 am

1 stop10h 15m

$153

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 7/1

7:05 pm-5:50 am

1 stop7h 45m

$154

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/13

Showing 1-10 of 14 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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*2 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 Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Ontario-Philadelphia flight deals on Cheapflights vs. Mytrip >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 Mytrip the most. Mytrip 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 April 11, 2025.

The best time to book flights from Ontario to Philadelphia is 14 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 April 15, 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.

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 April 15, 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
9,871 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,374 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,656 reviews
Alaska Airlines
8.0
Very good
9,871 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $180. Other airlines that can offer you cheap pricing are Delta, from $307, and American Airlines, from $343. Frontier is 55% 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 $89. However, be on the lookout for offers from Alaska Airlines and American 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
King of Prussia
Vineland
Pottstown
Wildwood
Reading
Cherry Hill
Exton
Ocean City
Essington
Chester
Newark
Middletown
Willow Grove
Millville
Ephrata
Camden
Dewey Beach
West Chester
Malvern
Dover

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 Ontario to Philadelphia

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

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 April 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$110Average$230FlexibilityNo cancel feeOn-time65%
FrontierCheapest$147Average$244FlexibilityNo cancel feeOn-time62%
DeltaCheapest$279Average$440FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$284Average$445FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$357Average$481FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$366Average$516FlexibilityNo 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.