$118+ 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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Aug 3 — Aug 101
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
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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 July 4, 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 July 4, 2026.
This Frontier deal was found by Cheapflights users on 6/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/273:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Fri 7/3112:54 pm
PHL
- ONT
1 stop13h 56m
Frontier
Deal found 6/29![Frontier logo]()
$305
This Frontier deal was found by Cheapflights users on 6/29. 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 7/283:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Sun 8/212:44 pm
PHL
- ONT
1 stop14h 06m
Frontier
Deal found 6/29![Frontier logo]()
$306
This Delta deal was found by Cheapflights users on 6/29. 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.
Tue 9/16:00 am
ONT
- PHL
1 stop8h 47m
Delta
Sat 9/127:20 am
PHL
- ONT
1 stop7h 54m
Delta
Deal found 6/29![Delta logo]()
$307
This Kiwi.com deal was found by Cheapflights users on 6/29. 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.
Mon 7/208:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Fri 7/2411:06 am
PHL
- ONT
2 stops27h 01m
Frontier
Deal found 6/29![Frontier logo]()
$308
This CheapOair deal was found by Cheapflights users on 7/3. 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 7/223:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Thu 8/68:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/3![Frontier logo]()
$309
This Frontier deal was found by Cheapflights users on 6/29. 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 7/163:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Fri 7/2411:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 6/29![Frontier logo]()
$310
This CheapOair deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/176:00 am
ONT
- PHL
1 stop26h 49m
Frontier
Sat 7/2511:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 6/30![Frontier logo]()
$311
This Frontier deal was found by Cheapflights users on 7/3. 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 7/81:38 pm
ONT
- PHL
1 stop13h 22m
Frontier
Fri 7/2411:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 7/3![Frontier logo]()
$312
This Frontier deal was found by Cheapflights users on 7/1. 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 7/93:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Mon 8/312:54 pm
PHL
- ONT
1 stop13h 56m
Frontier
Deal found 7/1![Frontier logo]()
$313
This CheapOair deal was found by Cheapflights users on 6/30. 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 9/232:55 pm
ONT
- PHL
1 stop11h 41m
Frontier
Thu 9/248:44 pm
PHL
- ONT
1 stop16h 59m
Frontier
Deal found 6/30![Frontier logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 7/2. 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 8/18:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Wed 8/511:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 7/2![Frontier logo]()
$315
This Frontier deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/248:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Fri 7/3111:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 7/2![Frontier logo]()
$316
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 July 4, 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 July 4, 2026.
This Delta deal was found by Cheapflights users on 7/3. 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 8/1212:00 pm
ONT
- PHL
1 stop8h 42m
Delta
Sun 8/307:00 pm
PHL
- ONT
1 stop7h 34m
Delta
Deal found 7/3![Delta logo]()
$348
This Southwest deal was found by Cheapflights users on 7/2. 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.
Sun 10/259:45 am
ONT
- PHL
1 stop7h 05m
Southwest
Mon 11/22:30 pm
PHL
- ONT
2 stops10h 40m
Southwest
Deal found 7/2![Southwest logo]()
$364
This CheapOair deal was found by Cheapflights users on 7/3. 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 7/283:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Sat 8/111:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 7/3![Frontier logo]()
$373
This United Airlines deal was found by Cheapflights users on 6/29. 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 10/286:46 am
ONT
- PHL
1 stop7h 56m
United Airlines
Sat 10/316:00 am
PHL
- ONT
1 stop9h 01m
United Airlines
Deal found 6/29![United Airlines logo]()
$412
This Priceline deal was found by Cheapflights users on 7/3. 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.
Fri 11/134:09 pm
ONT
- PHL
1 stop10h 24m
Multiple Airlines
Sun 11/156:00 am
PHL
- ONT
1 stop11h 37m
Multiple Airlines
Deal found 7/3![Multiple Airlines logo]()
$451
This Southwest deal was found by Cheapflights users on 7/2. 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.
Mon 10/261:30 pm
ONT
- PHL
2 stops8h 30m
Southwest
Mon 11/22:30 pm
PHL
- ONT
2 stops10h 40m
Southwest
Deal found 7/2![Southwest logo]()
$369
This Delta deal was found by Cheapflights users on 6/29. 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 12/2810:59 pm
ONT
- PHL
1 stop7h 28m
Delta
Thu 1/75:30 am
PHL
- ONT
1 stop8h 57m
Delta
Deal found 6/29![Delta logo]()
$418
This United Airlines deal was found by Cheapflights users on 7/3. 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 8/51:50 pm
ONT
- PHL
2 stops12h 41m
United Airlines
Wed 8/266:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 7/3![United Airlines logo]()
$448
This Southwest deal was found by Cheapflights users on 7/2. 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.
Thu 8/208:30 am
ONT
- PHL
2 stops9h 35m
Southwest
Sun 8/235:00 am
PHL
- ONT
2 stops9h 35m
Southwest
Deal found 7/2![Southwest logo]()
$413
This Delta deal was found by Cheapflights users on 7/2. 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.
Fri 12/255:05 pm
ONT
- PHL
1 stop9h 36m
Delta
Sun 1/36:40 pm
PHL
- ONT
1 stop8h 08m
Delta
Deal found 7/2![Delta logo]()
$419
This Southwest deal was found by Cheapflights users on 6/30. 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.
Sun 8/910:40 am
ONT
- PHL
2 stops9h 35m
Southwest
Wed 8/193:05 pm
PHL
- ONT
2 stops8h 50m
Southwest
Deal found 6/30![Southwest logo]()
$413
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated July 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated July 4, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/3. 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 7/81:38 pm
ONT
- PHL
1 stop13h 22m
Frontier
Fri 7/2411:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 7/3![Frontier logo]()
$312
This Frontier deal was found by Cheapflights users on 7/1. 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 7/98:17 am
ONT
- PHL
1 stop13h 44m
Frontier
Sat 8/228:00 am
PHL
- ONT
1 stop10h 54m
Frontier
Deal found 7/1![Frontier logo]()
$313
This Frontier deal was found by Cheapflights users on 6/29. 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 7/163:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Fri 7/2411:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 6/29![Frontier logo]()
$310
This CheapOair deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/176:00 am
ONT
- PHL
1 stop26h 49m
Frontier
Sat 7/2511:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 6/30![Frontier logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 6/29. 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.
Mon 7/208:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Fri 7/2411:06 am
PHL
- ONT
2 stops27h 01m
Frontier
Deal found 6/29![Frontier logo]()
$308
This CheapOair deal was found by Cheapflights users on 7/3. 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 7/223:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Thu 8/68:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/3![Frontier logo]()
$309
This Frontier deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/248:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Fri 7/3111:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 7/2![Frontier logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 7/2. 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.
Sun 7/266:00 am
ONT
- PHL
1 stop20h 39m
Frontier
Fri 7/311:32 pm
PHL
- ONT
2 stops24h 35m
Frontier
Deal found 7/2![Frontier logo]()
$317
This Frontier deal was found by Cheapflights users on 6/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/273:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Fri 7/3112:54 pm
PHL
- ONT
1 stop13h 56m
Frontier
Deal found 6/29![Frontier logo]()
$305
This Frontier deal was found by Cheapflights users on 6/29. 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 7/283:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Sun 8/212:44 pm
PHL
- ONT
1 stop14h 06m
Frontier
Deal found 6/29![Frontier logo]()
$306
This Kiwi.com deal was found by Cheapflights users on 7/2. 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 8/18:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Wed 8/511:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 7/2![Frontier logo]()
$315
This Kiwi.com deal was found by Cheapflights users on 7/2. 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.
Sun 8/28:17 am
ONT
- PHL
1 stop13h 44m
Frontier
Mon 8/104:40 pm
PHL
- ONT
2 stops17h 52m
Frontier
Deal found 7/2![Frontier logo]()
$318
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 July 4, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated July 4, 2026.
This Super.com deal was found by Cheapflights users on 6/29. 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.
Mon 8/108:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 6/29![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 7/3. 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 8/55:08 pm
ONT
- PHL
1 stop9h 52m
Frontier
Deal found 7/3![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 7/1. 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.
Sat 9/126:00 am
ONT
- PHL
1 stop20h 36m
Frontier
Deal found 7/1![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/313:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Deal found 6/30![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 6/30. 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 7/283:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Deal found 6/30![Frontier logo]()
$128
This Trip.com deal was found by Cheapflights users on 7/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:00 am
ONT
- PHL
1 stop20h 36m
Frontier
Deal found 7/1![Frontier logo]()
$130
This Mytrip deal was found by Cheapflights users on 7/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/248:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 7/1![Frontier logo]()
$131
This CheapOair deal was found by Cheapflights users on 7/1. 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 7/256:00 am
ONT
- PHL
1 stop26h 49m
Frontier
Deal found 7/1![Frontier logo]()
$133
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 July 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $305 (Frontier) |
One-way from | $118 (Super.com) |
Popular in | October |
Cheapest in | September |
Average price | $370 |
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 July 4, 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
Quickest round-trip
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 8/12
12:00 pm-11:42 pm
1 stop8h 42m
Philadelphia
Sun 8/30
7:00 pm-11:34 pm
1 stop7h 34m
$348
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sun 10/25
9:45 am-7:50 pm
1 stop7h 05m
Philadelphia
Mon 11/2
2:30 pm-10:10 pm
2 stops10h 40m
$364
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 10/26
1:30 pm-1:00 am
2 stops8h 30m
Philadelphia
Mon 11/2
2:30 pm-10:10 pm
2 stops10h 40m
$369
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 7/28
3:40 pm-6:00 am
1 stop11h 20m
Philadelphia
Sat 8/1
11:06 am-8:03 am
1 stop23h 57m
$373
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 10/28
6:46 am-5:42 pm
1 stop7h 56m
Philadelphia
Sat 10/31
6:00 am-12:01 pm
1 stop9h 01m
$412
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 8/20
8:30 am-9:05 pm
2 stops9h 35m
Philadelphia
Sun 8/23
5:00 am-11:35 am
2 stops9h 35m
$413
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sun 8/9
10:40 am-11:15 pm
2 stops9h 35m
Philadelphia
Wed 8/19
3:05 pm-8:55 pm
2 stops8h 50m
$413
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 12/28
10:59 pm-9:27 am
1 stop7h 28m
Philadelphia
Thu 1/7
5:30 am-11:27 am
1 stop8h 57m
$418
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 12/25
5:05 pm-5:41 am
1 stop9h 36m
Philadelphia
Sun 1/3
6:40 pm-11:48 pm
1 stop8h 08m
$419
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 8/5
1:50 pm-5:31 am
2 stops12h 41m
Philadelphia
Wed 8/26
6:00 am-12:12 pm
1 stop9h 12m
$448
Showing 1-10 of 22 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 July.
| 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 57 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 $305). Flying from Ontario to Philadelphia in October is currently the most expensive (average of $498). 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?
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 July 4, 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.
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
8.0
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
Plymouth Meeting
Cherry Hill
Lewes
Wyomissing
Dewey Beach
Pottstown
Ephrata
Milford
Wildwood Crest
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Ontario to Philadelphia
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Complete your trip
Complete your trip to Philadelphia by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Philadelphia by cabin class
Find flights from Ontario to Philadelphia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Philadelphia flights
Browse other Ontario and Philadelphia flight options. Last updated on July 4, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on July 4, 2026.
Other flights to Philadelphia
Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 July 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$157 | Average$286 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$296 | Average$399 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$300 | Average$458 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$312 | Average$428 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$358 | Average$487 | FlexibilityNo cancel fee | On-time63% |