$76+ 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Sep 12 — Sep 191
Round-trip
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
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Philadelphia
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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 August 13, 2026.
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 August 13, 2026.
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/23:40 pm -
1 stop11h 50m
Tue 9/810:15 pm -
1 stop13h 54m
Deal found 8/12![Frontier logo]()
$142
This Frontier deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:35 pm -
1 stop7h 43m
Mon 10/195:50 am -
1 stop7h 39m
Deal found 8/13![Frontier logo]()
$150
This FlightHub deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:15 am -
1 stop16h 01m
Thu 10/225:50 am -
1 stop7h 39m
Deal found 8/13![Frontier logo]()
$151
This Orbitz deal was found by Cheapflights users on 8/12. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1411:52 am -
1 stop8h 59m
Mon 10/195:50 am -
1 stop7h 39m
Deal found 8/12![Frontier logo]()
$158
This CheapOair deal was found by Cheapflights users on 8/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:38 am -
1 stop14h 58m
Thu 10/158:44 pm -
1 stop16h 59m
Deal found 8/11![Frontier logo]()
$168
This Frontier deal was found by Cheapflights users on 8/10. 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.
Sat 9/53:40 pm -
1 stop11h 50m
Tue 9/156:00 am -
1 stop13h 46m
Deal found 8/10![Frontier logo]()
$182
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/13:40 pm -
1 stop11h 50m
Sat 9/266:00 am -
1 stop13h 46m
Deal found 8/12![Frontier logo]()
$186
This FlightHub deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/410:17 pm -
1 stop29h 13m
Sat 9/126:00 am -
1 stop13h 46m
Deal found 8/13![Frontier logo]()
$189
This FlightHub deal was found by Cheapflights users on 8/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:15 am -
1 stop16h 01m
Wed 10/145:50 am -
1 stop7h 39m
Deal found 8/12![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 8/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:00 am -
1 stop20h 36m
Tue 10/138:44 pm -
1 stop16h 59m
Deal found 8/11![Frontier logo]()
$192
This Orbitz deal was found by Cheapflights users on 8/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/313:40 pm -
1 stop11h 50m
Wed 9/28:00 am -
1 stop10h 49m
Deal found 8/11![Frontier logo]()
$201
Best flights from Ontario to PhiladelphiaDiscover 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 August 13, 2026.
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 August 13, 2026.
This Delta deal was found by Cheapflights users on 8/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1212:17 pm -
1 stop9h 23m
Sat 9/196:00 am -
1 stop8h 05m
Deal found 8/10![Delta logo]()
$259
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/811:55 pm -
1 stop8h 40m
Fri 9/114:05 pm -
1 stop9h 10m
Deal found 8/11![Southwest logo]()
$326
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/56:53 pm -
1 stop9h 52m
Sat 1/96:10 am -
1 stop9h 10m
Deal found 8/11![United Airlines logo]()
$362
This Alaska Airlines deal was found by Cheapflights users on 8/8. 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.
Wed 10/212:13 pm -
1 stop12h 28m
Mon 10/264:17 pm -
1 stop10h 37m
Deal found 8/8![Alaska Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 8/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1412:22 pm -
1 stop7h 02m
Fri 1/16:40 pm -
1 stop8h 08m
Deal found 8/12![Delta logo]()
$313
This United Airlines deal was found by Cheapflights users on 8/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:00 am -
1 stop9h 41m
Mon 11/96:00 am -
1 stop9h 29m
Deal found 8/12![United Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 8/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2211:15 pm -
1 stop7h 14m
Sun 11/16:00 am -
1 stop8h 06m
Deal found 8/12![Delta logo]()
$334
This United Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:25 am -
1 stop10h 24m
Mon 11/29:10 am -
1 stop11h 46m
Deal found 8/13![United Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 8/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:00 am -
1 stop8h 42m
Mon 10/55:18 pm -
1 stop8h 06m
Deal found 8/12![Delta logo]()
$368
This Delta deal was found by Cheapflights users on 8/8. 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.
Thu 9/106:00 pm -
1 stop8h 50m
Tue 9/153:54 pm -
1 stop7h 30m
Deal found 8/8![Delta logo]()
$369
This Delta deal was found by Cheapflights users on 8/8. 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.
Sat 9/127:05 am -
1 stop8h 03m
Tue 9/153:54 pm -
1 stop7h 30m
Deal found 8/8![Delta logo]()
$369
This Delta deal was found by Cheapflights users on 8/8. 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.
Sat 10/36:00 pm -
1 stop8h 50m
Mon 10/127:20 am -
1 stop8h 01m
Deal found 8/8![Delta logo]()
$369
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated August 13, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated August 13, 2026 and is based on user searches.
This Orbitz deal was found by Cheapflights users on 8/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/313:40 pm -
1 stop11h 50m
Wed 9/28:00 am -
1 stop10h 49m
Deal found 8/11![Frontier logo]()
$201
This CheapOair deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3111:50 am -
1 stop15h 40m
Sat 9/58:37 pm -
1 stop16h 27m
Deal found 8/13![Frontier logo]()
$203
This Expedia deal was found by Cheapflights users on 8/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/313:40 pm -
1 stop11h 50m
Fri 9/48:37 pm -
1 stop30h 13m
Deal found 8/11![Frontier logo]()
$225
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/13:40 pm -
1 stop11h 50m
Sat 9/266:00 am -
1 stop13h 46m
Deal found 8/12![Frontier logo]()
$186
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/23:40 pm -
1 stop11h 50m
Tue 9/810:15 pm -
1 stop13h 54m
Deal found 8/12![Frontier logo]()
$142
This FlightHub deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/410:17 pm -
1 stop29h 13m
Sat 9/126:00 am -
1 stop13h 46m
Deal found 8/13![Frontier logo]()
$189
This Frontier deal was found by Cheapflights users on 8/10. 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.
Sat 9/53:40 pm -
1 stop11h 50m
Tue 9/156:00 am -
1 stop13h 46m
Deal found 8/10![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:24 pm -
2 stops11h 25m
Sat 9/126:00 am -
1 stop13h 46m
Deal found 8/11![Frontier logo]()
$239
This American Airlines deal was found by Cheapflights users on 8/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1612:37 pm -
1 stop8h 45m
Sat 9/191:00 pm -
1 stop8h 17m
Deal found 8/12![American Airlines logo]()
$241
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2211:55 pm -
1 stop8h 40m
Tue 9/295:10 pm -
1 stop7h 55m
Deal found 8/11![Southwest logo]()
$242
One-way flights from Ontario to PhiladelphiaSearch for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
This Super.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/23:40 pm -
1 stop11h 50m
Deal found 8/13![Frontier logo]()
$76
This Expedia deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:52 am -
1 stop10h 24m
Deal found 8/13![Frontier logo]()
$77
This Super.com deal was found by Cheapflights users on 8/11. 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.
Tue 9/16:00 am -
1 stop20h 39m
Deal found 8/11![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/222:55 pm -
1 stop7h 21m
Deal found 8/12![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 8/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/410:17 pm -
1 stop29h 13m
Deal found 8/12![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 8/10. 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.
Sat 9/53:40 pm -
1 stop11h 50m
Deal found 8/10![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:15 am -
1 stop16h 01m
Deal found 8/12![Frontier logo]()
$118
This American Airlines deal was found by Cheapflights users on 8/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/77:34 pm -
1 stop8h 07m
Deal found 8/12![American Airlines logo]()
$121
Find 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 August 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $142 (Frontier) |
One-way from | $76 (Super.com) |
Popular in | October |
Cheapest in | September |
Average price | $425 |
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 August 13, 2026.
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
Cheapest round-trip
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Sat 9/12
12:17 pm-12:40 am
1 stop9h 23m
Philadelphia
Sat 9/19
6:00 am-11:05 am
1 stop8h 05m
$259
Quickest round-trip
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Mon 12/14
12:22 pm-10:24 pm
1 stop7h 02m
Philadelphia
Fri 1/1
6:40 pm-11:48 pm
1 stop8h 08m
$313
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Tue 9/8
11:55 pm-11:35 am
1 stop8h 40m
Philadelphia
Fri 9/11
4:05 pm-10:15 pm
1 stop9h 10m
$326
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Thu 10/22
11:15 pm-9:29 am
1 stop7h 14m
Philadelphia
Sun 11/1
6:00 am-11:06 am
1 stop8h 06m
$334
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Tue 1/5
6:53 pm-7:45 am
1 stop9h 52m
Philadelphia
Sat 1/9
6:10 am-12:20 pm
1 stop9h 10m
$362
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Wed 11/4
6:00 am-6:41 pm
1 stop9h 41m
Philadelphia
Mon 11/9
6:00 am-12:29 pm
1 stop9h 29m
$367
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Sat 9/26
6:00 am-5:42 pm
1 stop8h 42m
Philadelphia
Mon 10/5
5:18 pm-10:24 pm
1 stop8h 06m
$368
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Wed 10/21
2:13 pm-5:41 am
1 stop12h 28m
Philadelphia
Mon 10/26
4:17 pm-11:54 pm
1 stop10h 37m
$369
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Thu 9/10
6:00 pm-5:50 am
1 stop8h 50m
Philadelphia
Tue 9/15
3:54 pm-8:24 pm
1 stop7h 30m
$369
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Sat 9/12
7:05 am-6:08 pm
1 stop8h 03m
Philadelphia
Tue 9/15
3:54 pm-8:24 pm
1 stop7h 30m
$369
Showing 1-10 of 24 resultsSorted by cheapest first
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 August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Philadelphia flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.
ONT-PHL
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?
The best time to book flights from Ontario to Philadelphia is 18 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, September is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $341). Flying from Ontario to Philadelphia in October is currently the most expensive (average of $494). 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.
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 $370 and $483 in September.The cheapest round-trip price found within the last 5 days was $142 on Frontier (Sep 2-Sep 8).
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 August 13, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited 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.
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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.
Traveling to a place near Philadelphia?
Book flights to Philadelphia if you plan to visit one of these locationsWildwood
King of Prussia
Reading
Camden
Ocean City
Cherry Hill
Lewes
Plymouth Meeting
Wyomissing
Wildwood Crest
Pottstown
Ephrata
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Vineland
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Ontario and Philadelphia flights
Browse other Ontario and Philadelphia flight options. Last updated on August 13, 2026.
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Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 13, 2026.
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Top 5 airlines flying from Ontario to Philadelphia
Discover the top 5 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 August 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$157 | Average$280 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$282 | Average$454 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$300 | Average$435 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$312 | Average$428 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$346 | Average$476 | FlexibilityNo cancel fee | On-time63% |