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$261+ Cheap flights from Islip, NY (ISP) to Ontario

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
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Cheap flight deals from Islip to Ontario

Keep the following information in mind while searching for Islip to Ontario flight deals. Data was last updated January 15, 2026.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$261
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$281
Provider with most accurate pricing for New York (NYC)-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Toronto (YTO) flights.
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From Islip Long Island to Ontario
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Highest demand for flights based on searches. 13% potential increase in price ($41 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 January 15, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Mon 2/233:59 pm
ISP
-
YYZ
1 stop22h 21m
Multiple Airlines
Fri 2/273:50 pm
YYZ
-
ISP
1 stop8h 54m
Multiple Airlines
Deal found 1/13$261
This Kiwi.com deal was found by Cheapflights users on 1/15. 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.
Sun 3/15:51 pm
ISP
-
YYZ
1 stop30h 38m
Multiple Airlines
Sun 3/88:00 am
YYZ
-
ISP
1 stop25h 48m
Multiple Airlines
Deal found 1/15$386
This Kiwi.com deal was found by Cheapflights users on 1/15. 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.
Sun 3/15:51 pm
ISP
-
YUL
1 stop30h 39m
Multiple Airlines
Sun 3/84:35 pm
YUL
-
ISP
2 stops20h 56m
Multiple Airlines
Deal found 1/15$475
This Kiwi.com deal was found by Cheapflights users on 1/15. 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.
Mon 1/198:54 pm
ISP
-
YYZ
2 stops23h 17m
Multiple Airlines
Wed 1/217:10 am
YYZ
-
ISP
1 stop11h 45m
Multiple Airlines
Deal found 1/15$557
This Kiwi.com deal was found by Cheapflights users on 1/14. 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 1/159:52 am
ISP
-
YOW
2 stops31h 01m
Multiple Airlines
Wed 1/214:40 pm
YOW
-
ISP
1 stop18h 25m
Multiple Airlines
Deal found 1/14$910
This Kiwi.com deal was found by Cheapflights users on 1/15. 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.
Sun 1/189:52 am
ISP
-
YUL
1 stop14h 38m
Multiple Airlines
Tue 1/206:02 pm
YUL
-
ISP
2 stops24h 53m
Multiple Airlines
Deal found 1/15$917

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 January 15, 2026.
Use the filters below to find and compare flights from Islip to Ontario that are best for you.

Fly from

Islip

Fly to

Ontario

Route

Depart

Return

Price

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Mon 2/23

3:59 pm-2:20 pm

1 stop22h 21m

Toronto Pearson Intl

Fri 2/27

3:50 pm-12:44 am

1 stop8h 54m

$261

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sun 3/1

5:51 pm-12:29 am

1 stop30h 38m

Toronto Pearson Intl

Sun 3/8

8:00 am-9:48 am

1 stop25h 48m

$386

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Sun 3/1

5:51 pm-12:30 am

1 stop30h 39m

Montreal Pierre Elliott Trudeau Intl

Sun 3/8

4:35 pm-1:31 pm

2 stops20h 56m

$475

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

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

What is the cheapest month to book a flight from Islip, New York to Region of Ontario?

Currently, May is the cheapest month in which you can book a flight from Islip, New York to Region of Ontario (average of $84). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of $128). 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.

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 - Toronto Pearson Intl, Islip Long Island - Ottawa and Islip Long Island - Montreal Pierre Elliott Trudeau Intl.

  • 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.

  • What is the cheapest month to book a flight from Islip, New York to Region of Ontario?

    Currently, May is the cheapest month in which you can book a flight from Islip, New York to Region of Ontario (average of $84). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of $128). 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.

See more FAQs

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