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$253+ Cheap flights from Islip, NY (ISP) to Ontario

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Aug 16 — Aug 231
Sun 8/16
Sun 8/23
1 adult, Economy
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Cheap flight deals from Islip to Ontario

Cheapest flights from Islip to Ontario
Explore the most affordable flight options available from Islip to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 17, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:28 pm
ISP
-
YYZ
2 stops30h 12m
Multiple Airlines
Fri 8/284:50 pm
YYZ
-
ISP
1 stop17h 03m
Multiple Airlines
Deal found 7/15$551
This Kiwi.com deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/281:00 pm
ISP
-
YYZ
2 stops25h 05m
Multiple Airlines
Mon 8/318:10 am
YYZ
-
ISP
1 stop10h 51m
Multiple Airlines
Deal found 7/16$591
This Kiwi.com deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:10 pm
ISP
-
YYZ
1 stop6h 30m
Multiple Airlines
Fri 9/49:50 am
YYZ
-
ISP
1 stop24h 03m
Multiple Airlines
Deal found 7/14$600
This Kiwi.com deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/143:10 pm
ISP
-
YUL
1 stop27h 05m
Multiple Airlines
Thu 8/206:45 am
YUL
-
ISP
2 stops11h 29m
Multiple Airlines
Deal found 7/15$717
This Kiwi.com deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:05 am
ISP
-
YUL
1 stop11h 10m
Multiple Airlines
Mon 8/246:45 am
YUL
-
ISP
2 stops11h 29m
Multiple Airlines
Deal found 7/13$761
This Kiwi.com deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/187:05 am
ISP
-
YYZ
1 stop4h 55m
Multiple Airlines
Fri 9/184:50 pm
YYZ
-
ISP
1 stop16h 43m
Multiple Airlines
Deal found 7/13$830
This Kiwi.com deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/67:31 am
ISP
-
YUL
1 stop10h 44m
Multiple Airlines
Sun 8/96:45 am
YUL
-
ISP
2 stops27h 08m
Multiple Airlines
Deal found 7/12$922
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 7/157:31 am
ISP
-
YUL
1 stop10h 44m
Multiple Airlines
Sat 7/185:10 pm
YUL
-
ISP
2 stops24h 56m
Multiple Airlines
Deal found 7/14$1,266
This Kiwi.com deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/164:50 pm
ISP
-
YUL
1 stop25h 25m
Multiple Airlines
Mon 7/207:20 pm
YUL
-
ISP
1 stop24h 55m
Multiple Airlines
Deal found 7/14$1,306
This Kiwi.com deal was found by Cheapflights users on 7/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/164:50 pm
ISP
-
YOW
1 stop24h 13m
Multiple Airlines
Mon 7/202:30 pm
YOW
-
ISP
1 stop5h 45m
Multiple Airlines
Deal found 7/14$1,628

Find flight deals from Islip to Ontario

Keep the following information in mind while searching for Islip to Ontario flight deals. Data was last updated July 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$551
(Kiwi.com)

One-way from

$253
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$331
Provider with most accurate pricing for New York (NYC)-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Toronto (YTO) flights.
Search Deals
From Islip Long Island to Ontario
Search Deals
One-way flight from Islip Long Island to Ontario
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 17, 2026.
Use the filters below to find and compare flights from Islip to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 8/21

8:31 pm-8:40 pm

1 stop24h 09m

Toronto Pearson Intl

Fri 8/28

4:50 pm-9:53 am

1 stop17h 03m

$554

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 8/28

1:00 pm-2:05 pm

2 stops25h 05m

Toronto Pearson Intl

Mon 8/31

8:10 am-7:01 pm

1 stop10h 51m

$591

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 8/28

3:10 pm-9:40 pm

1 stop6h 30m

Toronto Pearson Intl

Fri 9/4

9:50 am-9:53 am

1 stop24h 03m

$600

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 8/14

3:10 pm-6:15 pm

1 stop27h 05m

Montreal Pierre Elliott Trudeau Intl

Thu 8/20

6:45 am-6:14 pm

2 stops11h 29m

$717

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 8/21

7:05 am-6:15 pm

1 stop11h 10m

Montreal Pierre Elliott Trudeau Intl

Mon 8/24

6:45 am-6:14 pm

2 stops11h 29m

$761
Quickest round-trip

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 9/18

7:05 am-12:00 pm

1 stop4h 55m

Toronto Pearson Intl

Fri 9/18

4:50 pm-9:33 am

1 stop16h 43m

$830

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 8/6

7:31 am-6:15 pm

1 stop10h 44m

Montreal Pierre Elliott Trudeau Intl

Sun 8/9

6:45 am-9:53 am

2 stops27h 08m

$922
Cheapest one-way

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 8/21

2:28 pm-3:00 pm

3 stops48h 32m

$253

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 8/22

11:57 am-3:00 pm

3 stops27h 03m

$271

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Tue 8/4

11:56 am-12:25 pm

3 stops48h 29m

$324

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/14

Showing 1-10 of 13 resultsSorted by cheapest first
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Best time to book a flight from Islip to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Islip with our price prediction graph.
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 Islip to Ontario

No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Islip to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Ontario?

    If you book a flight to Ontario from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • What are the most popular routes from Islip, New York to Region of Ontario?

    The most popular flight routes from Islip, New York to Region of Ontario are Islip Long Island - Montreal Pierre Elliott Trudeau Intl, Islip Long Island - Toronto Pearson Intl and Islip Long Island - Ottawa.

  • Can I find deals for flights from Islip to Ontario that include hotel bookings?

    Yes. In addition to deals on Islip to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Ontario.

  • Can I find deals for business class flights from Islip to Ontario?

    Yes. Cheapflights offers flight deals from Islip to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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