$62+ 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 4/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
May 2 — May 91
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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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 April 2, 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 April 2, 2026.
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Mon 5/48:41 pm
PHL
- ONT
1 stop16h 24m
Frontier
Deal found 4/1![Frontier logo]()
$149
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Wed 5/612:17 pm
PHL
- ONT
1 stop9h 54m
Frontier
Deal found 4/1![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Mon 5/48:41 pm
PHL
- ONT
1 stop16h 24m
Frontier
Deal found 4/1![Frontier logo]()
$153
This Frontier deal was found by Cheapflights users on 3/31. 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.
Tue 4/217:44 pm
ONT
- PHL
1 stop8h 06m
Frontier
Sat 4/258:41 pm
PHL
- ONT
1 stop13h 45m
Frontier
Deal found 3/31![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 4/1. 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.
Sat 5/27:44 pm
ONT
- PHL
1 stop6h 41m
Frontier
Sat 5/98:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 4/1![Frontier logo]()
$161
This Booking.com deal was found by Cheapflights users on 3/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Fri 4/248:41 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/30![Frontier logo]()
$162
This Mytrip deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/275:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Fri 5/18:41 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 4/1![Frontier logo]()
$166
This Booking.com deal was found by Cheapflights users on 3/31. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/275:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Thu 4/306:43 am
PHL
- ONT
1 stop28h 21m
Frontier
Deal found 3/31![Frontier logo]()
$167
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:26 am
ONT
- PHL
1 stop12h 03m
Frontier
Mon 4/273:27 pm
PHL
- ONT
1 stop11h 16m
Frontier
Deal found 4/1![Frontier logo]()
$169
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/74:04 pm
ONT
- PHL
1 stop11h 48m
Frontier
Tue 5/128:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 3/31![Frontier logo]()
$171
This Booking.com deal was found by Cheapflights users on 3/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:26 am
ONT
- PHL
1 stop12h 03m
Frontier
Sun 4/266:43 am
PHL
- ONT
1 stop28h 41m
Frontier
Deal found 3/30![Frontier logo]()
$172
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 April 2, 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 April 2, 2026.
This Delta deal was found by Cheapflights users on 4/1. 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.
Sat 5/3010:00 pm
ONT
- PHL
1 stop8h 27m
Delta
Thu 6/46:45 pm
PHL
- ONT
1 stop7h 49m
Delta
Deal found 4/1![Delta logo]()
$263
This Alaska Airlines deal was found by Cheapflights users on 3/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/283:26 pm
ONT
- PHL
1 stop11h 36m
Alaska Airlines
Fri 5/17:22 am
PHL
- ONT
1 stop10h 10m
Alaska Airlines
Deal found 3/31![Alaska Airlines logo]()
$425
This Southwest deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/412:45 pm
ONT
- PHL
2 stops8h 55m
Southwest
Mon 6/85:00 am
PHL
- ONT
2 stops9h 20m
Southwest
Deal found 3/30![Southwest logo]()
$429
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Tue 5/55:00 am
ONT
- PHL
2 stops16h 59m
United Airlines
Wed 5/68:00 am
PHL
- ONT
1 stop7h 38m
United Airlines
Deal found 4/1![United Airlines logo]()
$460
This Delta deal was found by Cheapflights users on 4/1. 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.
Sat 5/305:45 pm
ONT
- PHL
1 stop8h 52m
Delta
Fri 6/56:45 pm
PHL
- ONT
1 stop7h 49m
Delta
Deal found 4/1![Delta logo]()
$306
This Delta deal was found by Cheapflights users on 4/1. 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 6/15:50 pm
ONT
- PHL
1 stop8h 45m
Delta
Fri 6/56:45 pm
PHL
- ONT
1 stop7h 49m
Delta
Deal found 4/1![Delta logo]()
$306
This Delta deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:49 pm
ONT
- PHL
1 stop9h 10m
Delta
Mon 5/45:30 am
PHL
- ONT
1 stop9h 06m
Delta
Deal found 3/29![Delta logo]()
$355
This United Airlines deal was found by Cheapflights users on 4/1. 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.
Mon 4/276:49 pm
ONT
- PHL
2 stops14h 28m
United Airlines
Thu 4/3011:32 am
PHL
- ONT
2 stops14h 27m
United Airlines
Deal found 4/1![United Airlines logo]()
$519
This Delta deal was found by Cheapflights users on 4/1. 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.
Sun 5/3112:07 pm
ONT
- PHL
1 stop7h 05m
Delta
Thu 6/46:45 pm
PHL
- ONT
1 stop7h 49m
Delta
Deal found 4/1![Delta logo]()
$400
This Delta deal was found by Cheapflights users on 3/31. 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 7/711:48 am
ONT
- PHL
1 stop10h 09m
Delta
Tue 7/214:08 pm
PHL
- ONT
1 stop8h 36m
Delta
Deal found 3/31![Delta logo]()
$437
This Delta deal was found by Cheapflights users on 3/28. 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 7/245:16 pm
ONT
- PHL
1 stop9h 57m
Delta
Fri 7/316:55 pm
PHL
- ONT
1 stop7h 49m
Delta
Deal found 3/28![Delta logo]()
$477
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated April 2, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated April 2, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Mon 5/48:41 pm
PHL
- ONT
1 stop16h 24m
Frontier
Deal found 4/1![Frontier logo]()
$149
This Frontier deal was found by Cheapflights users on 3/31. 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.
Tue 4/217:44 pm
ONT
- PHL
1 stop8h 06m
Frontier
Wed 4/298:31 pm
PHL
- ONT
1 stop14h 00m
Frontier
Deal found 3/31![Frontier logo]()
$160
This Booking.com deal was found by Cheapflights users on 3/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Fri 4/248:41 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/30![Frontier logo]()
$162
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:26 am
ONT
- PHL
1 stop12h 03m
Frontier
Mon 4/273:27 pm
PHL
- ONT
1 stop11h 16m
Frontier
Deal found 4/1![Frontier logo]()
$169
This Booking.com deal was found by Cheapflights users on 3/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:26 am
ONT
- PHL
1 stop12h 03m
Frontier
Sun 4/266:43 am
PHL
- ONT
1 stop28h 41m
Frontier
Deal found 3/30![Frontier logo]()
$172
This Mytrip deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/275:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Fri 5/18:41 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 4/1![Frontier logo]()
$166
This Booking.com deal was found by Cheapflights users on 3/31. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/275:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Thu 4/306:43 am
PHL
- ONT
1 stop28h 21m
Frontier
Deal found 3/31![Frontier logo]()
$167
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Wed 5/612:17 pm
PHL
- ONT
1 stop9h 54m
Frontier
Deal found 4/1![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Mon 5/48:41 pm
PHL
- ONT
1 stop16h 24m
Frontier
Deal found 4/1![Frontier logo]()
$153
This Frontier deal was found by Cheapflights users on 4/1. 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.
Sat 5/27:44 pm
ONT
- PHL
1 stop6h 41m
Frontier
Sat 5/98:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 4/1![Frontier logo]()
$161
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/74:04 pm
ONT
- PHL
1 stop11h 48m
Frontier
Tue 5/128:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 3/31![Frontier logo]()
$171
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 April 2, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated April 2, 2026.
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Deal found 4/1![Frontier logo]()
$62
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Deal found 4/1![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:50 am
ONT
- PHL
1 stop15h 47m
Frontier
Deal found 4/1![Frontier logo]()
$67
This Trip.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Deal found 4/1![Frontier logo]()
$68
This Super.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/275:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Deal found 4/1![Frontier logo]()
$79
This Booking.com deal was found by Cheapflights users on 4/1. 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 4/245:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Deal found 4/1![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 3/28. 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 5/64:39 pm
ONT
- PHL
1 stop9h 31m
Frontier
Deal found 3/28![Frontier logo]()
$81
This Super.com deal was found by Cheapflights users on 3/31. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/158:06 pm
ONT
- PHL
1 stop16h 10m
Frontier
Deal found 3/31![Frontier logo]()
$85
This Booking.com deal was found by Cheapflights users on 3/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Deal found 3/30![Frontier logo]()
$86
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 April 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $149 (Trip.com) |
One-way from | $62 (Trip.com) |
Popular in | October |
Cheapest in | May |
Average price | $400 |
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 April 2, 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
Sat 5/30
10:00 pm-9:27 am
1 stop8h 27m
Philadelphia
Thu 6/4
6:45 pm-11:34 pm
1 stop7h 49m
$263
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sat 5/30
5:45 pm-5:37 am
1 stop8h 52m
Philadelphia
Fri 6/5
6:45 pm-11:34 pm
1 stop7h 49m
$306
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 6/1
5:50 pm-5:35 am
1 stop8h 45m
Philadelphia
Fri 6/5
6:45 pm-11:34 pm
1 stop7h 49m
$306
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 4/21
12:49 pm-12:59 am
1 stop9h 10m
Philadelphia
Mon 5/4
5:30 am-11:36 am
1 stop9h 06m
$355
Quickest round-trip
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sun 5/31
12:07 pm-10:12 pm
1 stop7h 05m
Philadelphia
Thu 6/4
6:45 pm-11:34 pm
1 stop7h 49m
$400
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 4/28
3:26 pm-6:02 am
1 stop11h 36m
Philadelphia
Fri 5/1
7:22 am-2:32 pm
1 stop10h 10m
$425
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 6/4
12:45 pm-12:40 am
2 stops8h 55m
Philadelphia
Mon 6/8
5:00 am-11:20 am
2 stops9h 20m
$429
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 7/7
11:48 am-12:57 am
1 stop10h 09m
Philadelphia
Tue 7/21
4:08 pm-9:44 pm
1 stop8h 36m
$437
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 5/5
5:00 am-12:59 am
2 stops16h 59m
Philadelphia
Wed 5/6
8:00 am-12:38 pm
1 stop7h 38m
$460
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 7/24
5:16 pm-6:13 am
1 stop9h 57m
Philadelphia
Fri 7/31
6:55 pm-11:44 pm
1 stop7h 49m
$477
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | 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
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How far ahead should I book a flight from Ontario to Philadelphia?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to Philadelphia. Price data was last updated on March 13, 2026.
The best time to book flights from Ontario to Philadelphia is 15 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, June is the cheapest month in which you can book a flight from Ontario to Philadelphia (average of $78). Flying from Ontario to Philadelphia in March is currently the most expensive (average of $168). 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?
What’s the top layover airport for flights from Ontario to Philadelphia?
Share of 1-stop round-trip flights from Ontario to Philadelphia chosen by Cheapflights users in the past 12 months, using the same layover each way.
Detroit (DTW) – chosen by Cheapflights users on 50% of 1-stop itineraries from Ontario to Philadelphia on Cheapflights.
What’s the cheapest layover airport for flights from Ontario to Philadelphia?
Average round-trip fare for 1-stop flights from Ontario to Philadelphia, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Atlanta (ATL) is the most affordable 1-stop option, with an average round-trip price of $381.
What’s the fastest layover option from Ontario to Philadelphia?
Shortest average travel time for 1-stop one-way flights from Ontario to Philadelphia, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Atlanta (ATL) have the shortest average one-way travel time for 1-stop routes: 8h 11m.
Which airport typically offers the quickest layover for flights from Ontario to Philadelphia?
Average layover duration for 1-stop one-way flights from Ontario to Philadelphia, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Atlanta (ATL) offer the fastest connection on this route, with an average layover time of 1h 33m.
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 April 2, 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.
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
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
Reading
King of Prussia
Camden
Ocean City
Lewes
Dewey Beach
Pottstown
Ephrata
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Glen Mills
Chester
Newark
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Complete your trip
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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 April 2, 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 April 2, 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 April 2, 2026.
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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 April 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$157 | Average$277 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$296 | Average$400 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$300 | Average$465 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$333 | Average$451 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$356 | Average$483 | FlexibilityNo cancel fee | On-time63% |