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$200+ 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 5/31. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Apr 28 — May 51
Tue 4/28
Tue 5/5
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 March 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:31 pm
ISP
-
YYZ
1 stop24h 09m
Multiple Airlines
Mon 5/181:55 pm
YYZ
-
ISP
2 stops21h 05m
Multiple Airlines
Deal found 3/26$478
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/308:31 pm
ISP
-
YYZ
2 stops23h 04m
Multiple Airlines
Sun 5/38:10 am
YYZ
-
ISP
1 stop11h 26m
Multiple Airlines
Deal found 3/27$575
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:07 pm
ISP
-
YYZ
2 stops22h 20m
Multiple Airlines
Mon 5/48:10 am
YYZ
-
ISP
1 stop11h 26m
Multiple Airlines
Deal found 3/26$576
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/112:30 pm
ISP
-
YOW
1 stop4h 20m
Multiple Airlines
Mon 5/44:20 pm
YOW
-
ISP
1 stop18h 40m
Multiple Airlines
Deal found 3/28$590
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/228:43 pm
ISP
-
YYZ
2 stops14h 36m
Multiple Airlines
Tue 5/269:50 am
YYZ
-
ISP
1 stop24h 15m
Multiple Airlines
Deal found 3/25$597
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/911:00 am
ISP
-
YUL
2 stops27h 08m
Multiple Airlines
Sat 5/167:20 pm
YUL
-
ISP
1 stop15h 45m
Multiple Airlines
Deal found 3/25$664
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1311:00 am
ISP
-
YUL
2 stops27h 08m
Multiple Airlines
Wed 5/207:20 pm
YUL
-
ISP
1 stop15h 45m
Multiple Airlines
Deal found 3/29$668
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:43 pm
ISP
-
YUL
2 stops41h 25m
Multiple Airlines
Mon 5/187:20 pm
YUL
-
ISP
1 stop15h 45m
Multiple Airlines
Deal found 3/27$695
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:46 pm
ISP
-
YYZ
2 stops15h 37m
Multiple Airlines
Sun 6/144:50 pm
YYZ
-
ISP
1 stop17h 13m
Multiple Airlines
Deal found 3/27$697
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:30 am
ISP
-
YUL
2 stops19h 05m
Multiple Airlines
Sun 4/124:35 pm
YUL
-
ISP
1 stop22h 36m
Multiple Airlines
Deal found 3/28$705
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/66:40 pm
ISP
-
YUL
1 stop29h 50m
Multiple Airlines
Sat 4/114:35 pm
YUL
-
ISP
1 stop18h 38m
Multiple Airlines
Deal found 3/25$852
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2811:50 am
ISP
-
YUL
2 stops12h 40m
Multiple Airlines
Sun 3/294:35 pm
YUL
-
ISP
1 stop19h 58m
Multiple Airlines
Deal found 3/27$868

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 March 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$478
(Kiwi.com)

One-way from

$200
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$263
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. 11% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 29, 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

Mon 5/11

8:31 pm-8:40 pm

1 stop24h 09m

Toronto Pearson Intl

Mon 5/18

9:50 am-11:00 am

1 stop25h 10m

$478

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Thu 4/30

8:31 pm-7:35 pm

2 stops23h 04m

Toronto Pearson Intl

Sun 5/3

8:10 am-7:36 pm

1 stop11h 26m

$575

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 5/1

4:07 pm-2:27 pm

2 stops22h 20m

Toronto Pearson Intl

Mon 5/4

8:10 am-7:36 pm

1 stop11h 26m

$576

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 5/22

8:43 pm-11:19 am

2 stops14h 36m

Toronto Pearson Intl

Tue 5/26

9:50 am-10:05 am

1 stop24h 15m

$597

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Fri 5/1

12:30 pm-9:44 pm

2 stops9h 14m

Ottawa

Mon 5/4

4:20 pm-11:00 am

1 stop18h 40m

$612

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Sat 5/9

11:00 am-2:08 pm

2 stops27h 08m

Montreal Pierre Elliott Trudeau Intl

Sat 5/16

7:20 pm-11:05 am

1 stop15h 45m

$664

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 5/13

11:00 am-2:08 pm

2 stops27h 08m

Montreal Pierre Elliott Trudeau Intl

Wed 5/20

7:20 pm-11:05 am

1 stop15h 45m

$668

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Mon 5/11

8:43 pm-2:08 pm

2 stops41h 25m

Montreal Pierre Elliott Trudeau Intl

Mon 5/18

7:20 pm-11:05 am

1 stop15h 45m

$695

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 4/9

5:30 am-12:35 am

2 stops19h 05m

Montreal Pierre Elliott Trudeau Intl

Sun 4/12

4:35 pm-3:11 pm

1 stop22h 36m

$705

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Tue 8/11

12:30 pm-6:15 pm

1 stop5h 45m

Montreal Pierre Elliott Trudeau Intl

Thu 8/13

8:00 pm-12:20 pm

2 stops16h 20m

$969

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 22 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

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 $83). 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 - Montreal Pierre Elliott Trudeau 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.

  • 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 $83). 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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