$109+ Cheap flights from Ontario to Philadelphia (ONT - PHL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Oct 10 — Oct 171
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 September 10, 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 September 10, 2026.
This Trip.com deal was found by Cheapflights users on 9/9. 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.
Wed 10/2111:52 am -
1 stop8h 58m
Tue 10/2712:36 pm -
2 stops14h 15m
Deal found 9/9![Frontier logo]()
$245
This Trip.com deal was found by Cheapflights users on 9/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:26 am -
1 stop16h 52m
Tue 10/2712:36 pm -
2 stops14h 15m
Deal found 9/8![Frontier logo]()
$253
This Trip.com deal was found by Cheapflights users on 9/9. 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.
Sat 10/1710:04 am -
1 stop18h 14m
Tue 10/2012:35 pm -
2 stops14h 15m
Deal found 9/9![Frontier logo]()
$254
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/2211:52 am -
1 stop10h 24m
Tue 10/2712:36 pm -
2 stops14h 15m
Deal found 9/9![Frontier logo]()
$263
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/198:35 pm -
1 stop7h 43m
Wed 10/215:50 am -
1 stop7h 39m
Deal found 9/10![Frontier logo]()
$269
This Frontier deal was found by Cheapflights users on 9/9. 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 10/135:25 pm -
1 stop10h 53m
Fri 10/235:50 am -
1 stop7h 39m
Deal found 9/9![Frontier logo]()
$270
This Frontier deal was found by Cheapflights users on 9/5. 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 10/105:25 pm -
1 stop10h 53m
Sat 10/178:44 pm -
1 stop17h 32m
Deal found 9/5![Frontier logo]()
$271
This Frontier deal was found by Cheapflights users on 9/5. 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 10/205:25 pm -
1 stop10h 53m
Tue 10/276:00 am -
1 stop13h 38m
Deal found 9/5![Frontier logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/2211:52 am -
1 stop10h 24m
Mon 10/2612:35 pm -
2 stops25h 00m
Deal found 9/9![Frontier logo]()
$273
This Booking.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/98:35 pm -
1 stop7h 43m
Mon 10/128:44 pm -
1 stop16h 47m
Deal found 9/5![Frontier logo]()
$276
This CheapOair deal was found by Cheapflights users on 9/9. 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 10/198:35 pm -
1 stop7h 43m
Sat 10/245:50 am -
1 stop7h 39m
Deal found 9/9![Frontier logo]()
$277
This FlightHub deal was found by Cheapflights users on 9/6. 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 10/98:35 pm -
1 stop7h 43m
Tue 10/138:44 pm -
1 stop22h 46m
Deal found 9/6![Frontier logo]()
$279
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 September 10, 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 September 10, 2026.
This Delta deal was found by Cheapflights users on 9/9. 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 9/306:00 am -
1 stop8h 42m
Sat 10/32:30 pm -
1 stop7h 11m
Deal found 9/9![Delta logo]()
$369
This Alaska Airlines deal was found by Cheapflights users on 9/5. 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 -
2 stops26h 45m
Deal found 9/5![Alaska Airlines logo]()
$433
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/301:24 pm -
1 stop6h 56m
Sat 10/39:27 am -
1 stop11h 19m
Deal found 9/9![United Airlines logo]()
$479
This Delta deal was found by Cheapflights users on 9/9. 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 11/176:00 am -
1 stop8h 38m
Fri 11/277:15 am -
1 stop8h 05m
Deal found 9/9![Delta logo]()
$379
This Delta deal was found by Cheapflights users on 9/5. 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 10/1911:08 pm -
1 stop7h 21m
Thu 10/295:20 am -
1 stop8h 46m
Deal found 9/5![Delta logo]()
$389
This Alaska Airlines deal was found by Cheapflights users on 9/7. 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 10/156:02 am -
1 stop20h 39m
Mon 10/196:41 pm -
2 stops24h 21m
Deal found 9/7![Alaska Airlines logo]()
$433
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/106:00 am -
1 stop8h 15m
Wed 11/1110:54 am -
2 stops12h 21m
Deal found 9/9![United Airlines logo]()
$484
This Delta deal was found by Cheapflights users on 9/7. 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 10/712:16 pm -
1 stop9h 40m
Tue 10/132:26 pm -
1 stop8h 59m
Deal found 9/7![Delta logo]()
$454
This United Airlines deal was found by Cheapflights users on 9/6. 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 10/301:32 pm -
1 stop7h 07m
Tue 11/31:20 pm -
2 stops10h 31m
Deal found 9/6![United Airlines logo]()
$504
This Delta deal was found by Cheapflights users on 9/7. 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 10/712:16 pm -
1 stop9h 40m
Mon 10/125:20 am -
1 stop8h 46m
Deal found 9/7![Delta logo]()
$479
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated September 10, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/98:35 pm -
1 stop7h 43m
Mon 10/128:44 pm -
1 stop16h 47m
Deal found 9/5![Frontier logo]()
$276
This FlightHub deal was found by Cheapflights users on 9/6. 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 10/98:35 pm -
1 stop7h 43m
Tue 10/138:44 pm -
1 stop22h 46m
Deal found 9/6![Frontier logo]()
$279
This Frontier deal was found by Cheapflights users on 9/5. 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 10/105:25 pm -
1 stop10h 53m
Sat 10/178:44 pm -
1 stop17h 32m
Deal found 9/5![Frontier logo]()
$271
This Trip.com deal was found by Cheapflights users on 9/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:26 am -
1 stop16h 52m
Tue 10/2712:36 pm -
2 stops14h 15m
Deal found 9/8![Frontier logo]()
$253
This Frontier deal was found by Cheapflights users on 9/9. 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 10/135:25 pm -
1 stop10h 53m
Fri 10/235:50 am -
1 stop7h 39m
Deal found 9/9![Frontier logo]()
$270
This Trip.com deal was found by Cheapflights users on 9/9. 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.
Sat 10/1710:04 am -
1 stop18h 14m
Tue 10/2012:35 pm -
2 stops14h 15m
Deal found 9/9![Frontier logo]()
$254
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/198:35 pm -
1 stop7h 43m
Wed 10/215:50 am -
1 stop7h 39m
Deal found 9/10![Frontier logo]()
$269
This CheapOair deal was found by Cheapflights users on 9/9. 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 10/198:35 pm -
1 stop7h 43m
Sat 10/245:50 am -
1 stop7h 39m
Deal found 9/9![Frontier logo]()
$277
This Frontier deal was found by Cheapflights users on 9/5. 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 10/205:25 pm -
1 stop10h 53m
Tue 10/276:00 am -
1 stop13h 38m
Deal found 9/5![Frontier logo]()
$272
This Trip.com deal was found by Cheapflights users on 9/9. 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.
Wed 10/2111:52 am -
1 stop8h 58m
Tue 10/2712:36 pm -
2 stops14h 15m
Deal found 9/9![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/2211:52 am -
1 stop10h 24m
Tue 10/2712:36 pm -
2 stops14h 15m
Deal found 9/9![Frontier logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/2211:52 am -
1 stop10h 24m
Mon 10/2612:35 pm -
2 stops25h 00m
Deal found 9/9![Frontier logo]()
$273
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 September 10, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/2711:52 am -
2 stops16h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 11/411:52 am -
2 stops16h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/3111:52 am -
2 stops17h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 9/5. 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 10/238:35 pm -
1 stop7h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$132
This Super.com deal was found by Cheapflights users on 9/5. 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 10/228:35 pm -
1 stop7h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$133
This Super.com deal was found by Cheapflights users on 9/9. 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 10/268:35 pm -
1 stop7h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 9/9. 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 10/1411:52 am -
1 stop8h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$135
This Super.com deal was found by Cheapflights users on 9/9. 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 10/136:15 am -
1 stop16h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$137
This Super.com deal was found by Cheapflights users on 9/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:04 am -
1 stop18h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$139
This FlightHub deal was found by Cheapflights users on 9/6. 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.
Sun 10/116:15 am -
1 stop16h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$144
This Frontier deal was found by Cheapflights users on 9/10. 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.
Fri 10/98:35 pm -
1 stop7h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$146
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 September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $253 (Trip.com) |
One-way from | $109 (Kiwi.com) |
Popular in | October |
Cheapest in | July |
Average price | $437 |
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 7,457,451 searches. Data last updated September 10, 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
Sun 11/1
1:20 pm-12:05 am
1 stop7h 45m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$185
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Wed 10/7
6:00 pm-5:44 am
1 stop8h 44m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$185
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Sun 11/1
1:29 pm-11:39 pm
1 stop7h 10m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$185
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Thu 10/15
6:00 pm-5:44 am
1 stop8h 44m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$185
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Sat 10/24
5:00 am-9:29 pm
2 stops13h 29m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$190
Quickest round-trip
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Sat 10/3
11:10 am-8:55 pm
1 stop6h 45m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$197
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Tue 10/6
6:00 am-5:39 pm
1 stop8h 39m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$207
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Thu 10/8
11:52 am-1:16 am
1 stop10h 24m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$219
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Mon 10/12
5:03 pm-6:05 am
1 stop10h 02m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$220
OntarioPhiladelphia
ONT Ontario - PHL Philadelphia
ONTPHL
Ontario
Wed 9/30
1:24 pm-11:20 pm
1 stop6h 56m
Philadelphia
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$240
Showing 1-10 of 20 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 September.
| 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 38 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, July is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $358). Flying from Ontario to Philadelphia in October is currently the most expensive (average of $514). 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 $358 and $466 in October.The cheapest round-trip price found within the last 5 days was $245 on Frontier (Oct 21-Oct 27).
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 September 10, 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.
Crew
8.6
Overall
8.0
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
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
Reading
King of Prussia
Camden
Wildwood Crest
Cherry Hill
Ocean City
Lewes
Plymouth Meeting
Wyomissing
Pottstown
Ephrata
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Vineland
Millville
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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
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Ontario and Philadelphia flights
Browse other Ontario and Philadelphia flight options. Last updated on September 10, 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 September 10, 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 September 10, 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 7,457,451 searches. Data last updated September 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$157 | Average$276 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$282 | Average$457 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$312 | Average$462 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$317 | Average$444 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$346 | Average$440 | FlexibilityNo cancel fee | On-time63% |