$116+ 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Jul 4 — Jul 111
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 June 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 June 4, 2026.
This Delta deal was found by Cheapflights users on 5/31. 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 9/17:05 am
ONT
- PHL
1 stop9h 53m
Delta
Wed 9/96:45 am
PHL
- ONT
1 stop7h 19m
Delta
Deal found 5/31![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 5/31. 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 8/316:01 pm
ONT
- PHL
1 stop8h 39m
Delta
Tue 9/87:00 am
PHL
- ONT
1 stop8h 29m
Delta
Deal found 5/31![Delta logo]()
$269
This CheapOair deal was found by Cheapflights users on 6/1. 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.
Fri 8/78:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Mon 8/108:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 6/1![Frontier logo]()
$271
This American Airlines deal was found by Cheapflights users on 6/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:59 pm
ONT
- PHL
1 stop7h 29m
American Airlines
Tue 8/255:00 am
PHL
- ONT
1 stop7h 34m
American Airlines
Deal found 6/1![American Airlines logo]()
$274
This United Airlines deal was found by Cheapflights users on 6/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/197:00 am
ONT
- PHL
1 stop7h 54m
United Airlines
Thu 9/246:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 6/1![United Airlines logo]()
$276
This Delta deal was found by Cheapflights users on 6/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:00 pm
ONT
- PHL
1 stop8h 38m
Delta
Thu 8/275:15 am
PHL
- ONT
1 stop8h 27m
Delta
Deal found 6/1![Delta logo]()
$281
This Frontier deal was found by Cheapflights users on 5/31. 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 7/411:58 am
ONT
- PHL
1 stop15h 29m
Frontier
Sat 7/1111:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 5/31![Frontier logo]()
$284
This Booking.com deal was found by Cheapflights users on 6/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Wed 7/111:06 am
PHL
- ONT
1 stop11h 45m
Frontier
Deal found 6/1![Frontier logo]()
$289
This Frontier deal was found by Cheapflights users on 6/1. 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.
Sun 7/268:17 am
ONT
- PHL
1 stop13h 44m
Frontier
Fri 8/711:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 6/1![Frontier logo]()
$290
This Frontier deal was found by Cheapflights users on 6/2. 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 6/266:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Tue 6/3011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 6/2![Frontier logo]()
$292
This Frontier deal was found by Cheapflights users on 6/1. 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.
Wed 6/243:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Mon 6/2911:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 6/1![Frontier logo]()
$293
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 June 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 June 4, 2026.
This Delta deal was found by Cheapflights users on 5/31. 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 9/26:01 pm
ONT
- PHL
1 stop8h 39m
Delta
Tue 9/86:45 am
PHL
- ONT
1 stop7h 19m
Delta
Deal found 5/31![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 6/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:20 pm
ONT
- PHL
2 stops10h 11m
United Airlines
Tue 7/146:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 6/2![United Airlines logo]()
$360
This Southwest deal was found by Cheapflights users on 6/4. 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.
Fri 7/32:30 pm
ONT
- PHL
1 stop7h 10m
Southwest
Fri 7/108:00 am
PHL
- ONT
1 stop8h 50m
Southwest
Deal found 6/4![Southwest logo]()
$364
This Delta deal was found by Cheapflights users on 5/31. 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 9/17:05 am
ONT
- PHL
1 stop9h 53m
Delta
Wed 9/96:45 am
PHL
- ONT
1 stop7h 19m
Delta
Deal found 5/31![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 5/31. 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 9/17:05 am
ONT
- PHL
1 stop9h 53m
Delta
Sun 9/66:00 am
PHL
- ONT
1 stop7h 42m
Delta
Deal found 5/31![Delta logo]()
$308
This Southwest deal was found by Cheapflights users on 6/4. 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.
Sat 7/45:40 am
ONT
- PHL
2 stops9h 25m
Southwest
Fri 7/105:00 am
PHL
- ONT
1 stop7h 05m
Southwest
Deal found 6/4![Southwest logo]()
$364
This United Airlines deal was found by Cheapflights users on 5/31. 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.
Mon 8/317:13 pm
ONT
- PHL
2 stops11h 54m
United Airlines
Sat 9/53:05 pm
PHL
- ONT
2 stops10h 30m
United Airlines
Deal found 5/31![United Airlines logo]()
$401
This Southwest deal was found by Cheapflights users on 6/4. 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.
Sat 7/45:40 am
ONT
- PHL
2 stops9h 25m
Southwest
Sat 7/112:50 pm
PHL
- ONT
2 stops11h 05m
Southwest
Deal found 6/4![Southwest logo]()
$386
This United Airlines deal was found by Cheapflights users on 5/31. 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.
Mon 8/177:13 pm
ONT
- PHL
2 stops14h 10m
United Airlines
Thu 8/276:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 5/31![United Airlines logo]()
$435
This Southwest deal was found by Cheapflights users on 6/2. 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.
Tue 7/75:15 am
ONT
- PHL
2 stops9h 45m
Southwest
Tue 7/145:15 am
PHL
- ONT
2 stops9h 15m
Southwest
Deal found 6/2![Southwest logo]()
$434
This United Airlines deal was found by Cheapflights users on 6/4. 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 7/71:50 pm
ONT
- PHL
2 stops12h 41m
United Airlines
Tue 7/216:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 6/4![United Airlines logo]()
$470
This Southwest deal was found by Cheapflights users on 6/2. 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 7/212:45 pm
ONT
- PHL
2 stops8h 55m
Southwest
Tue 7/712:55 pm
PHL
- ONT
2 stops9h 05m
Southwest
Deal found 6/2![Southwest logo]()
$451
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated June 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated June 4, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/3. 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.
Mon 6/223:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Sat 7/411:35 am
PHL
- ONT
1 stop8h 13m
Frontier
Deal found 6/3![Frontier logo]()
$299
This Booking.com deal was found by Cheapflights users on 6/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Wed 7/111:06 am
PHL
- ONT
1 stop11h 45m
Frontier
Deal found 6/1![Frontier logo]()
$289
This Frontier deal was found by Cheapflights users on 6/4. 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 6/233:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Tue 6/3011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 6/4![Frontier logo]()
$301
This Frontier deal was found by Cheapflights users on 6/1. 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.
Wed 6/243:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Mon 6/2911:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 6/1![Frontier logo]()
$293
This Frontier deal was found by Cheapflights users on 6/2. 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 6/266:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Tue 6/3011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 6/2![Frontier logo]()
$292
This Booking.com deal was found by Cheapflights users on 6/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/266:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Sat 6/2712:42 pm
PHL
- ONT
1 stop24h 23m
Frontier
Deal found 6/1![Frontier logo]()
$300
This Expedia deal was found by Cheapflights users on 6/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/25:43 pm
ONT
- PHL
1 stop18h 24m
Frontier
Tue 7/712:44 pm
PHL
- ONT
1 stop24h 20m
Frontier
Deal found 6/3![Frontier logo]()
$297
This Frontier deal was found by Cheapflights users on 5/31. 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 7/411:58 am
ONT
- PHL
1 stop15h 29m
Frontier
Sat 7/1111:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 5/31![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/83:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Mon 7/134:40 pm
PHL
- ONT
2 stops42h 23m
Frontier
Deal found 6/3![Frontier logo]()
$296
This Frontier deal was found by Cheapflights users on 6/4. 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 7/223:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Thu 7/3011:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 6/4![Frontier logo]()
$295
This Frontier deal was found by Cheapflights users on 6/1. 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.
Sun 7/268:17 am
ONT
- PHL
1 stop13h 44m
Frontier
Fri 8/711:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 6/1![Frontier logo]()
$290
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 June 4, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated June 4, 2026.
This Frontier deal was found by Cheapflights users on 5/30. 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.
Wed 7/88:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 5/30![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 6/4. 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 7/248:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 6/4![Frontier logo]()
$118
This Priceline deal was found by Cheapflights users on 6/4. 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.
Mon 7/208:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 6/4![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 6/3. 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.
Sat 7/43:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Deal found 6/3![Frontier logo]()
$124
This Super.com deal was found by Cheapflights users on 6/4. 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 7/26:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Deal found 6/4![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 6/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Deal found 6/2![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 5/31. 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 7/258:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 5/31![Frontier logo]()
$129
This CheapOair deal was found by Cheapflights users on 6/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/106:00 am
ONT
- PHL
1 stop26h 49m
Frontier
Deal found 6/2![Frontier logo]()
$131
This Flightnetwork deal was found by Cheapflights users on 6/1. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2211:58 am
ONT
- PHL
1 stop15h 29m
Frontier
Deal found 6/1![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 June 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (Delta) |
One-way from | $116 (Frontier) |
Popular in | October |
Cheapest in | September |
Average price | $413 |
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 June 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 9/2
6:01 pm-5:40 am
1 stop8h 39m
Philadelphia
Tue 9/8
6:45 am-11:04 am
1 stop7h 19m
$257
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 9/1
7:05 am-7:58 pm
1 stop9h 53m
Philadelphia
Wed 9/9
6:45 am-11:04 am
1 stop7h 19m
$257
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 9/1
7:05 am-7:58 pm
1 stop9h 53m
Philadelphia
Sun 9/6
6:00 am-10:42 am
1 stop7h 42m
$308
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 7/7
4:20 pm-5:31 am
2 stops10h 11m
Philadelphia
Tue 7/14
6:00 am-12:12 pm
1 stop9h 12m
$360
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 7/3
2:30 pm-12:40 am
1 stop7h 10m
Philadelphia
Fri 7/10
8:00 am-1:50 pm
1 stop8h 50m
$364
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sat 7/4
5:40 am-6:05 pm
2 stops9h 25m
Philadelphia
Fri 7/10
5:00 am-9:05 am
1 stop7h 05m
$364
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sat 7/4
5:40 am-6:05 pm
2 stops9h 25m
Philadelphia
Sat 7/11
2:50 pm-10:55 pm
2 stops11h 05m
$386
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/31
7:13 pm-10:07 am
2 stops11h 54m
Philadelphia
Sat 9/5
3:05 pm-10:35 pm
2 stops10h 30m
$401
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 7/7
5:15 am-6:00 pm
2 stops9h 45m
Philadelphia
Tue 7/14
5:15 am-11:30 am
2 stops9h 15m
$434
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/17
7:13 pm-12:23 pm
2 stops14h 10m
Philadelphia
Thu 8/27
6:00 am-12:12 pm
1 stop9h 12m
$435
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 June.
| 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 |
- 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 $353). 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?
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 June 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
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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
Dewey Beach
Pottstown
Ephrata
Milford
Plymouth Meeting
Wildwood Crest
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Vineland
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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 June 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 June 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 June 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 June 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$155 | Average$273 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$282 | Average$396 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$300 | Average$460 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$312 | Average$436 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$358 | Average$483 | FlexibilityNo cancel fee | On-time63% |