$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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PHL
Jun 29 — Jul 61
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 May 30, 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 May 30, 2026.
This Frontier deal was found by Cheapflights users on 5/25. 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 7/16:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Thu 7/911:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/25![Frontier logo]()
$240
This American Airlines deal was found by Cheapflights users on 5/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1811:59 pm
ONT
- PHL
1 stop10h 04m
American Airlines
Tue 8/255:00 am
PHL
- ONT
1 stop9h 43m
American Airlines
Deal found 5/29![American Airlines logo]()
$257
This Trip.com deal was found by Cheapflights users on 5/26. 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 7/98:17 am
ONT
- PHL
1 stop13h 44m
Frontier
Mon 7/1311:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 5/26![Frontier logo]()
$259
This United Airlines deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:15 am
ONT
- PHL
1 stop10h 16m
United Airlines
Tue 8/253:05 pm
PHL
- ONT
2 stops10h 30m
United Airlines
Deal found 5/29![United Airlines logo]()
$262
This Frontier deal was found by Cheapflights users on 5/25. 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 6/293:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Thu 7/911:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/25![Frontier logo]()
$270
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/35:43 pm
ONT
- PHL
1 stop18h 24m
Frontier
Sat 7/1111:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 5/25![Frontier logo]()
$271
This Frontier deal was found by Cheapflights users on 5/26. 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
Thu 7/911:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/26![Frontier logo]()
$272
This Booking.com deal was found by Cheapflights users on 5/25. 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.
Sun 7/126:00 am
ONT
- PHL
1 stop20h 39m
Frontier
Sun 8/211:06 am
PHL
- ONT
1 stop23h 57m
Frontier
Deal found 5/25![Frontier logo]()
$277
This Mytrip deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/216:00 am
ONT
- PHL
1 stop20h 38m
Frontier
Thu 8/278:37 pm
PHL
- ONT
1 stop30h 12m
Frontier
Deal found 5/25![Frontier logo]()
$279
This Delta deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:00 pm
ONT
- PHL
1 stop8h 38m
Delta
Thu 8/273:58 pm
PHL
- ONT
1 stop8h 54m
Delta
Deal found 5/29![Delta logo]()
$281
This Frontier deal was found by Cheapflights users on 5/26. 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 6/173:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Fri 6/197:00 am
PHL
- ONT
1 stop13h 52m
Frontier
Deal found 5/26![Frontier logo]()
$282
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 May 30, 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 May 30, 2026.
This United Airlines deal was found by Cheapflights users on 5/25. 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 8/211:18 pm
ONT
- PHL
1 stop7h 27m
United Airlines
Fri 8/286:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 5/25![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 5/27. 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 8/1010:00 pm
ONT
- PHL
1 stop10h 05m
Delta
Fri 8/145:15 am
PHL
- ONT
1 stop8h 27m
Delta
Deal found 5/27![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:30 am
ONT
- PHL
2 stops9h 35m
Southwest
Thu 8/272:10 pm
PHL
- ONT
2 stops9h 10m
Southwest
Deal found 5/25![Southwest logo]()
$387
This Alaska Airlines deal was found by Cheapflights users on 5/26. 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.
Mon 8/172:05 pm
ONT
- PHL
2 stops22h 18m
Alaska Airlines
Thu 8/276:08 pm
PHL
- ONT
1 stop19h 56m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$452
This United Airlines deal was found by Cheapflights users on 5/25. 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 9/116:00 am
ONT
- PHL
1 stop7h 46m
United Airlines
Fri 9/256:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 5/25![United Airlines logo]()
$354
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1712:45 pm
ONT
- PHL
2 stops9h 00m
Southwest
Tue 7/215:15 am
PHL
- ONT
2 stops9h 15m
Southwest
Deal found 5/30![Southwest logo]()
$396
This Southwest deal was found by Cheapflights users on 5/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:30 am
ONT
- PHL
2 stops9h 35m
Southwest
Mon 9/75:25 am
PHL
- ONT
1 stop7h 55m
Southwest
Deal found 5/28![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 5/25. 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 8/218:30 am
ONT
- PHL
2 stops9h 35m
Southwest
Fri 8/284:05 pm
PHL
- ONT
2 stops8h 40m
Southwest
Deal found 5/25![Southwest logo]()
$411
This United Airlines deal was found by Cheapflights users on 5/26. 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 7/81:50 pm
ONT
- PHL
2 stops12h 41m
United Airlines
Wed 7/156:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 5/26![United Airlines logo]()
$462
This Southwest deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/171:20 pm
ONT
- PHL
1 stop8h 40m
Southwest
Mon 6/225:00 am
PHL
- ONT
2 stops9h 20m
Southwest
Deal found 5/25![Southwest logo]()
$464
This Southwest deal was found by Cheapflights users on 5/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1912:45 pm
ONT
- PHL
2 stops8h 35m
Southwest
Mon 6/225:00 am
PHL
- ONT
2 stops9h 20m
Southwest
Deal found 5/29![Southwest logo]()
$479
Last-minute flights from Ontario to PhiladelphiaDiscover last-minute flight deals from Ontario to Philadelphia. Data last updated May 30, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Philadelphia. Data last updated May 30, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 5/26. 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 6/163:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Sun 6/2111:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 5/26![Frontier logo]()
$297
This Frontier deal was found by Cheapflights users on 5/26. 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 6/171:33 pm
ONT
- PHL
1 stop13h 54m
Frontier
Sat 6/207:00 am
PHL
- ONT
1 stop13h 52m
Frontier
Deal found 5/26![Frontier logo]()
$279
This Frontier deal was found by Cheapflights users on 5/26. 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 6/173:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Fri 6/197:00 am
PHL
- ONT
1 stop13h 52m
Frontier
Deal found 5/26![Frontier logo]()
$282
This Gotogate deal was found by Cheapflights users on 5/26. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/195:43 pm
ONT
- PHL
1 stop18h 24m
Frontier
Sun 6/2111:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 5/26![Frontier logo]()
$301
This Frontier deal was found by Cheapflights users on 5/26. 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
Thu 7/911:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/26![Frontier logo]()
$272
This Frontier deal was found by Cheapflights users on 5/26. 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
Tue 6/3011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 5/26![Frontier logo]()
$289
This Frontier deal was found by Cheapflights users on 5/26. 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
Mon 7/611:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/26![Frontier logo]()
$290
This Frontier deal was found by Cheapflights users on 5/26. 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
Fri 7/1011:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/26![Frontier logo]()
$296
This Booking.com deal was found by Cheapflights users on 5/25. 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 6/255:43 pm
ONT
- PHL
1 stop18h 24m
Frontier
Thu 7/211:35 am
PHL
- ONT
1 stop8h 13m
Frontier
Deal found 5/25![Frontier logo]()
$277
This Booking.com deal was found by Cheapflights users on 5/26. 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 6/255:43 pm
ONT
- PHL
1 stop18h 24m
Frontier
Tue 6/3011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 5/26![Frontier logo]()
$305
This Frontier deal was found by Cheapflights users on 5/25. 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 6/293:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Thu 7/911:06 am
PHL
- ONT
1 stop7h 48m
Frontier
Deal found 5/25![Frontier logo]()
$270
This Frontier deal was found by Cheapflights users on 5/26. 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 6/306:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Thu 7/211:35 am
PHL
- ONT
1 stop8h 13m
Frontier
Deal found 5/26![Frontier logo]()
$287
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 May 30, 2026.
Search for one-way flight options from Ontario to Philadelphia. Find affordable one-way fares based on user searches. Data last updated May 30, 2026.
This Frontier deal was found by Cheapflights users on 5/28. 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.
Tue 7/148:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 5/28![Frontier logo]()
$116
This Southwest deal was found by Cheapflights users on 5/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/301:50 pm
ONT
- PHL
1 stop7h 00m
Southwest
Deal found 5/29![Southwest logo]()
$118
This Super.com deal was found by Cheapflights users on 5/25. 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 7/178:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 5/25![Frontier logo]()
$119
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/108:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 5/25![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 5/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Deal found 5/29![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 5/26. 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 6/266:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Deal found 5/26![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 5/26. 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 7/16:47 pm
ONT
- PHL
1 stop12h 43m
Frontier
Deal found 5/26![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 5/26. 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 6/163:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Deal found 5/26![Frontier logo]()
$127
This CheapOair deal was found by Cheapflights users on 5/27. 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 6/223:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Deal found 5/27![Frontier logo]()
$128
This Delta deal was found by Cheapflights users on 5/29. 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 8/116:01 pm
ONT
- PHL
1 stop8h 39m
Delta
Deal found 5/29![Delta logo]()
$129
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 May 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (American Airlines) |
One-way from | $116 (Frontier) |
Popular in | October |
Cheapest in | September |
Average price | $376 |
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 May 30, 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
Fri 8/21
1:18 pm-11:45 pm
1 stop7h 27m
Philadelphia
Fri 8/28
6:00 am-12:12 pm
1 stop9h 12m
$354
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 9/11
6:00 am-4:46 pm
1 stop7h 46m
Philadelphia
Fri 9/25
6:00 am-12:12 pm
1 stop9h 12m
$354
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/10
10:00 pm-11:05 am
1 stop10h 05m
Philadelphia
Fri 8/14
5:15 am-10:42 am
1 stop8h 27m
$359
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 8/20
8:30 am-9:05 pm
2 stops9h 35m
Philadelphia
Thu 8/27
2:10 pm-8:20 pm
2 stops9h 10m
$387
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 7/17
12:45 pm-12:45 am
2 stops9h 00m
Philadelphia
Tue 7/21
5:15 am-11:30 am
2 stops9h 15m
$396
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 9/3
8:30 am-9:05 pm
2 stops9h 35m
Philadelphia
Mon 9/7
5:25 am-10:20 am
1 stop7h 55m
$403
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 8/21
8:30 am-9:05 pm
2 stops9h 35m
Philadelphia
Fri 8/28
4:05 pm-9:45 pm
2 stops8h 40m
$411
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/17
2:05 pm-3:23 pm
2 stops22h 18m
Philadelphia
Thu 8/27
6:08 pm-11:04 am
1 stop19h 56m
$452
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 7/8
1:50 pm-5:31 am
2 stops12h 41m
Philadelphia
Wed 7/15
6:00 am-12:12 pm
1 stop9h 12m
$462
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 6/17
1:20 pm-1:00 am
1 stop8h 40m
Philadelphia
Mon 6/22
5:00 am-11:20 am
2 stops9h 20m
$464
Showing 1-10 of 21 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 May.
| 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 $350). 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 May 30, 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.
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Overall
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
Wildwood Crest
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Vineland
Glen Mills
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Alternative routes for Ontario to Philadelphia
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Complete your trip
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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 May 30, 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 May 30, 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 May 30, 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 May 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$155 | Average$275 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$282 | Average$381 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$300 | Average$459 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$312 | Average$436 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$358 | Average$483 | FlexibilityNo cancel fee | On-time63% |