$103+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Aug 22 — Aug 291
Round-trip
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.Cheap flight deals from Ontario to Philadelphia
Cheapest
Best
Last-minute
One-way
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 23, 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 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 8/256:00 am
ONT
- PHL
2 stops27h 26m
Frontier
Sat 8/298:00 am
PHL
- ONT
1 stop10h 54m
Frontier
Deal found 7/23![Frontier logo]()
$238
This Expedia deal was found by Cheapflights users on 7/20. 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.
Fri 8/283:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Sun 8/308:37 pm
PHL
- ONT
1 stop30h 13m
Frontier
Deal found 7/20![Frontier logo]()
$240
This Frontier deal was found by Cheapflights users on 7/22. 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 8/223:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Sat 8/298:00 am
PHL
- ONT
1 stop27h 03m
Frontier
Deal found 7/22![Frontier logo]()
$241
This Frontier deal was found by Cheapflights users on 7/21. 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 8/138:17 am
ONT
- PHL
1 stop13h 40m
Frontier
Mon 8/248:00 am
PHL
- ONT
1 stop11h 22m
Frontier
Deal found 7/21![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 7/22. 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 8/134:09 pm
ONT
- PHL
1 stop10h 51m
Frontier
Mon 8/1711:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 7/22![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 7/21. 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.
Fri 8/148:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Mon 8/242:45 pm
PHL
- ONT
2 stops36h 05m
Frontier
Deal found 7/21![Frontier logo]()
$245
This Orbitz deal was found by Cheapflights users on 7/20. 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 8/106:00 am
ONT
- PHL
1 stop26h 49m
Frontier
Mon 8/248:37 pm
PHL
- ONT
1 stop30h 13m
Frontier
Deal found 7/20![Frontier logo]()
$248
This Super.com deal was found by Cheapflights users on 7/21. 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.
Thu 8/203:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Fri 8/218:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/21![Frontier logo]()
$249
This CheapOair deal was found by Cheapflights users on 7/20. 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 9/410:17 pm
ONT
- PHL
1 stop29h 13m
Frontier
Tue 9/88:37 pm
PHL
- ONT
1 stop20h 20m
Frontier
Deal found 7/20![Frontier logo]()
$250
This Frontier deal was found by Cheapflights users on 7/20. 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 8/148:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Fri 8/288:00 am
PHL
- ONT
1 stop11h 22m
Frontier
Deal found 7/20![Frontier logo]()
$251
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 23, 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 23, 2026.
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Thu 10/299:00 am
ONT
- PHL
1 stop8h 26m
United Airlines
Sat 10/316:00 am
PHL
- ONT
1 stop9h 01m
United Airlines
Deal found 7/22![United Airlines logo]()
$306
This Delta deal was found by Cheapflights users on 7/22. 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 9/226:00 pm
ONT
- PHL
1 stop8h 50m
Delta
Sat 9/266:00 am
PHL
- ONT
1 stop8h 05m
Delta
Deal found 7/22![Delta logo]()
$311
This Southwest deal was found by Cheapflights users on 7/22. 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 10/291:05 pm
ONT
- PHL
2 stops8h 55m
Southwest
Sat 10/315:00 am
PHL
- ONT
1 stop7h 25m
Southwest
Deal found 7/22![Southwest logo]()
$316
This Alaska Airlines deal was found by Cheapflights users on 7/18. 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.
Thu 11/54:09 pm
ONT
- PHL
1 stop10h 24m
Alaska Airlines
Tue 11/107:00 am
PHL
- ONT
1 stop31h 18m
Alaska Airlines
Deal found 7/18![Alaska Airlines logo]()
$447
This Delta deal was found by Cheapflights users on 7/22. 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 11/205:05 pm
ONT
- PHL
1 stop9h 36m
Delta
Mon 11/236:40 pm
PHL
- ONT
1 stop8h 08m
Delta
Deal found 7/22![Delta logo]()
$345
This Southwest deal was found by Cheapflights users on 7/20. 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 10/286:50 am
ONT
- PHL
2 stops8h 05m
Southwest
Sun 11/17:30 am
PHL
- ONT
1 stop8h 35m
Southwest
Deal found 7/20![Southwest logo]()
$373
This Delta deal was found by Cheapflights users on 7/20. 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 11/1610:59 pm
ONT
- PHL
1 stop7h 28m
Delta
Thu 12/36:40 pm
PHL
- ONT
1 stop8h 08m
Delta
Deal found 7/20![Delta logo]()
$348
This Delta deal was found by Cheapflights users on 7/19. 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 12/126:00 am
ONT
- PHL
1 stop8h 40m
Delta
Mon 1/46:40 pm
PHL
- ONT
1 stop8h 08m
Delta
Deal found 7/19![Delta logo]()
$348
This United Airlines deal was found by Cheapflights users on 7/18. 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 8/259:15 am
ONT
- PHL
1 stop10h 16m
United Airlines
Wed 8/266:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 7/18![United Airlines logo]()
$442
This Alaska Airlines deal was found by Cheapflights users on 7/19. 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.
Fri 11/64:09 pm
ONT
- PHL
1 stop10h 24m
Alaska Airlines
Tue 11/107:00 am
PHL
- ONT
1 stop31h 18m
Alaska Airlines
Deal found 7/19![Alaska Airlines logo]()
$447
This Delta deal was found by Cheapflights users on 7/22. 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 11/205:05 pm
ONT
- PHL
1 stop9h 36m
Delta
Sun 11/226:40 pm
PHL
- ONT
1 stop8h 08m
Delta
Deal found 7/22![Delta logo]()
$438
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated July 23, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated July 23, 2026 and is based on user searches.
This Orbitz deal was found by Cheapflights users on 7/20. 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 8/106:00 am
ONT
- PHL
1 stop26h 49m
Frontier
Mon 8/248:37 pm
PHL
- ONT
1 stop30h 13m
Frontier
Deal found 7/20![Frontier logo]()
$248
This Frontier deal was found by Cheapflights users on 7/21. 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 8/138:17 am
ONT
- PHL
1 stop13h 40m
Frontier
Mon 8/248:00 am
PHL
- ONT
1 stop11h 22m
Frontier
Deal found 7/21![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 7/22. 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 8/134:09 pm
ONT
- PHL
1 stop10h 51m
Frontier
Mon 8/1711:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 7/22![Frontier logo]()
$244
This CheapOair deal was found by Cheapflights users on 7/22. 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.
Thu 8/138:17 am
ONT
- PHL
1 stop13h 40m
Frontier
Sun 8/237:00 am
PHL
- ONT
1 stop28h 03m
Frontier
Deal found 7/22![Frontier logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 7/21. 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.
Fri 8/148:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Mon 8/242:45 pm
PHL
- ONT
2 stops36h 05m
Frontier
Deal found 7/21![Frontier logo]()
$245
This Frontier deal was found by Cheapflights users on 7/20. 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 8/148:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Fri 8/288:00 am
PHL
- ONT
1 stop11h 22m
Frontier
Deal found 7/20![Frontier logo]()
$251
This Super.com deal was found by Cheapflights users on 7/21. 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.
Thu 8/203:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Fri 8/218:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/21![Frontier logo]()
$249
This Frontier deal was found by Cheapflights users on 7/22. 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 8/223:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Sat 8/298:00 am
PHL
- ONT
1 stop27h 03m
Frontier
Deal found 7/22![Frontier logo]()
$241
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 8/256:00 am
ONT
- PHL
2 stops27h 26m
Frontier
Sat 8/298:00 am
PHL
- ONT
1 stop10h 54m
Frontier
Deal found 7/23![Frontier logo]()
$238
This Priceline deal was found by Cheapflights users on 7/23. 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.
Thu 8/273:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Tue 9/18:00 am
PHL
- ONT
1 stop10h 54m
Frontier
Deal found 7/23![Frontier logo]()
$250
This Expedia deal was found by Cheapflights users on 7/20. 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.
Fri 8/283:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Sun 8/308:37 pm
PHL
- ONT
1 stop30h 13m
Frontier
Deal found 7/20![Frontier logo]()
$240
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 23, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated July 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/22. 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.
Tue 8/187:56 pm
ONT
- PHL
2 stops23h 37m
Frontier
Deal found 7/22![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 7/22. 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.
Wed 8/266:00 am
ONT
- PHL
2 stops27h 26m
Frontier
Deal found 7/22![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 7/18. 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 8/125:08 pm
ONT
- PHL
1 stop9h 52m
Frontier
Deal found 7/18![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 7/21. 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 8/158:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 7/21![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 7/19. 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 8/118:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 7/19![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 7/19. 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.
Sun 8/2310:49 am
ONT
- PHL
1 stop15h 50m
Frontier
Deal found 7/19![Frontier logo]()
$124
This Super.com deal was found by Cheapflights users on 7/22. 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 8/2810:17 pm
ONT
- PHL
1 stop29h 13m
Frontier
Deal found 7/22![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 7/19. 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 8/313:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Deal found 7/19![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 7/22. 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.
Thu 8/138:17 am
ONT
- PHL
1 stop13h 40m
Frontier
Deal found 7/22![Frontier logo]()
$127
This Super.com deal was found by Cheapflights users on 7/21. 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 8/148:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 7/21![Frontier logo]()
$130
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 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $238 (Kiwi.com) |
One-way from | $103 (Kiwi.com) |
Popular in | October |
Cheapest in | September |
Average price | $361 |
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 23, 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 - PHL
ONTPHL
Ontario
Thu 10/29
9:00 am-8:26 pm
1 stop8h 26m
Philadelphia
Sat 10/31
6:00 am-12:01 pm
1 stop9h 01m
$306
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 9/22
6:00 pm-5:50 am
1 stop8h 50m
Philadelphia
Sat 9/26
6:00 am-11:05 am
1 stop8h 05m
$311
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 10/29
1:05 pm-1:00 am
2 stops8h 55m
Philadelphia
Sat 10/31
5:00 am-9:25 am
1 stop7h 25m
$316
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 11/20
5:05 pm-5:41 am
1 stop9h 36m
Philadelphia
Mon 11/23
6:40 pm-11:48 pm
1 stop8h 08m
$345
Quickest round-trip
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 11/16
10:59 pm-9:27 am
1 stop7h 28m
Philadelphia
Thu 12/3
6:40 pm-11:48 pm
1 stop8h 08m
$348
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sat 12/12
6:00 am-5:40 pm
1 stop8h 40m
Philadelphia
Mon 1/4
6:40 pm-11:48 pm
1 stop8h 08m
$348
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 10/28
6:50 am-5:55 pm
2 stops8h 05m
Philadelphia
Sun 11/1
7:30 am-1:05 pm
1 stop8h 35m
$373
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 11/20
5:05 pm-5:41 am
1 stop9h 36m
Philadelphia
Sun 11/22
6:40 pm-11:48 pm
1 stop8h 08m
$438
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 8/25
9:15 am-10:31 pm
1 stop10h 16m
Philadelphia
Wed 8/26
6:00 am-12:12 pm
1 stop9h 12m
$442
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 11/5
4:09 pm-5:33 am
1 stop10h 24m
Philadelphia
Tue 11/10
7:00 am-11:18 am
1 stop31h 18m
$447
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 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 $347 and $461 in August.The cheapest round-trip price found within the last 5 days was $238 on Frontier (Aug 25-Aug 29).
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 23, 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
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
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
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Ontario
Philadelphia flight routes
Popular flights
Alternative routes for Ontario to Philadelphia
See prices for flight routes from nearby airports that may be better suited for you.
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 23, 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 23, 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 23, 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 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$155 | Average$283 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$282 | Average$399 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$302 | Average$437 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$312 | Average$428 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$347 | Average$487 | FlexibilityNo cancel fee | On-time63% |