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$194+ 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 6/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Jun 20 — Jun 271
Sat 6/20
Sat 6/27
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 May 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/17. 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 6/109:52 pm
ISP
-
YYZ
1 stop18h 53m
Multiple Airlines
Sun 6/144:50 pm
YYZ
-
ISP
1 stop28h 07m
Multiple Airlines
Deal found 5/17$482
This Kiwi.com deal was found by Cheapflights users on 5/19. 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 6/159:52 pm
ISP
-
YYZ
1 stop18h 53m
Multiple Airlines
Sun 6/214:50 pm
YYZ
-
ISP
1 stop28h 07m
Multiple Airlines
Deal found 5/19$562
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 7/32:28 pm
ISP
-
YOW
2 stops24h 05m
Multiple Airlines
Fri 7/107:00 am
YOW
-
ISP
1 stop26h 53m
Multiple Airlines
Deal found 5/20$599
This Kiwi.com deal was found by Cheapflights users on 5/19. 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 5/3011:00 am
ISP
-
YYZ
1 stop9h 05m
Multiple Airlines
Wed 6/39:50 am
YYZ
-
ISP
1 stop24h 15m
Multiple Airlines
Deal found 5/19$616
This Kiwi.com deal was found by Cheapflights users on 5/17. 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 6/311:00 am
ISP
-
YYZ
1 stop9h 05m
Multiple Airlines
Tue 6/99:50 am
YYZ
-
ISP
2 stops25h 27m
Multiple Airlines
Deal found 5/17$642
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 5/247:53 pm
ISP
-
YYZ
2 stops44h 52m
Multiple Airlines
Tue 6/29:50 am
YYZ
-
ISP
1 stop7h 27m
Multiple Airlines
Deal found 5/18$728
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 7/210:00 am
ISP
-
YUL
1 stop8h 15m
Multiple Airlines
Thu 7/97:20 pm
YUL
-
ISP
2 stops38h 38m
Multiple Airlines
Deal found 5/18$768
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/177:41 pm
ISP
-
YOW
2 stops28h 39m
Multiple Airlines
Wed 6/245:35 pm
YOW
-
ISP
1 stop19h 55m
Multiple Airlines
Deal found 5/20$780
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 7/46:09 pm
ISP
-
YYZ
2 stops29h 26m
Multiple Airlines
Sat 7/115:35 pm
YYZ
-
ISP
1 stop18h 55m
Multiple Airlines
Deal found 5/20$790
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/292:11 pm
ISP
-
YOW
1 stop26h 42m
Multiple Airlines
Thu 7/97:00 am
YOW
-
ISP
2 stops26h 53m
Multiple Airlines
Deal found 5/20$825
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 6/69:00 am
ISP
-
YUL
1 stop9h 15m
Multiple Airlines
Sun 6/77:20 pm
YUL
-
ISP
2 stops18h 08m
Multiple Airlines
Deal found 5/18$832
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 7/107:00 am
ISP
-
YUL
1 stop11h 15m
Multiple Airlines
Mon 7/135:45 pm
YUL
-
ISP
2 stops22h 11m
Multiple Airlines
Deal found 5/18$854

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 May 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$482
(Kiwi.com)

One-way from

$194
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$311
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. 8% potential increase in price ($26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 21, 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

Wed 6/10

9:52 pm-4:45 pm

1 stop18h 53m

Toronto Pearson Intl

Sun 6/14

4:50 pm-8:57 pm

1 stop28h 07m

$482

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Mon 6/15

9:52 pm-4:45 pm

1 stop18h 53m

Toronto Pearson Intl

Sun 6/21

4:50 pm-8:57 pm

1 stop28h 07m

$562

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Fri 7/3

2:28 pm-2:33 pm

2 stops24h 05m

Ottawa

Fri 7/10

7:00 am-9:53 am

1 stop26h 53m

$599

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 7/2

10:00 am-6:15 pm

1 stop8h 15m

Montreal Pierre Elliott Trudeau Intl

Thu 7/9

7:20 pm-9:58 am

2 stops38h 38m

$768

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Wed 6/17

7:41 pm-12:20 am

2 stops28h 39m

Ottawa

Wed 6/24

5:35 pm-1:30 pm

1 stop19h 55m

$780

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 7/4

6:09 pm-11:35 pm

2 stops29h 26m

Toronto Pearson Intl

Sat 7/11

5:35 pm-12:30 pm

1 stop18h 55m

$790

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Mon 6/29

2:11 pm-4:53 pm

1 stop26h 42m

Ottawa

Thu 7/9

7:00 am-9:53 am

2 stops26h 53m

$825

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Sat 6/6

9:00 am-6:15 pm

1 stop9h 15m

Montreal Pierre Elliott Trudeau Intl

Sun 6/7

7:20 pm-1:28 pm

2 stops18h 08m

$832

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 7/10

7:00 am-6:15 pm

1 stop11h 15m

Montreal Pierre Elliott Trudeau Intl

Mon 7/13

5:45 pm-3:56 pm

2 stops22h 11m

$854

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 6/18

4:45 pm-6:15 pm

1 stop25h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 6/23

10:35 am-5:41 pm

2 stops7h 06m

$857

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/17

Showing 1-10 of 16 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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