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$341+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Jul 4 — Jul 111
Sat 7/4
Sat 7/11
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 June 4, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/31. 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 6/179:52 pm
ISP
-
YYZ
1 stop16h 38m
Multiple Airlines
Sat 6/207:45 am
YYZ
-
ISP
1 stop13h 12m
Multiple Airlines
Deal found 5/31$495
This Kiwi.com deal was found by Cheapflights users on 5/31. 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 6/58:31 pm
ISP
-
YYZ
1 stop24h 09m
Multiple Airlines
Fri 6/129:50 am
YYZ
-
ISP
1 stop11h 07m
Multiple Airlines
Deal found 5/31$560
This Kiwi.com deal was found by Cheapflights users on 5/31. 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.
Tue 6/304:41 pm
ISP
-
YYZ
1 stop27h 24m
Multiple Airlines
Tue 7/79:50 am
YYZ
-
ISP
1 stop24h 03m
Multiple Airlines
Deal found 5/31$618
This Kiwi.com deal was found by Cheapflights users on 5/31. 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 6/289:52 pm
ISP
-
YYZ
1 stop22h 13m
Multiple Airlines
Sun 7/54:50 pm
YYZ
-
ISP
1 stop17h 03m
Multiple Airlines
Deal found 5/31$649
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 7/19:52 pm
ISP
-
YYZ
1 stop18h 53m
Multiple Airlines
Tue 7/79:50 am
YYZ
-
ISP
1 stop24h 03m
Multiple Airlines
Deal found 6/1$672
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 7/310:48 am
ISP
-
YYZ
1 stop12h 47m
Multiple Airlines
Sun 7/57:25 am
YYZ
-
ISP
1 stop5h 05m
Multiple Airlines
Deal found 6/1$705
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 7/302:11 pm
ISP
-
YYZ
1 stop7h 54m
Multiple Airlines
Sun 8/29:50 am
YYZ
-
ISP
1 stop24h 03m
Multiple Airlines
Deal found 6/1$716
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 8/610:00 am
ISP
-
YUL
1 stop8h 15m
Multiple Airlines
Sun 8/97:20 pm
YUL
-
ISP
2 stops18h 08m
Multiple Airlines
Deal found 6/1$756
This Kiwi.com deal was found by Cheapflights users on 6/2. 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 6/511:00 am
ISP
-
YOW
1 stop27h 33m
Multiple Airlines
Wed 6/107:00 am
YOW
-
ISP
2 stops13h 57m
Multiple Airlines
Deal found 6/2$776
This Kiwi.com deal was found by Cheapflights users on 6/1. 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.
Tue 6/3010:00 am
ISP
-
YOW
1 stop6h 53m
Multiple Airlines
Tue 7/72:10 pm
YOW
-
ISP
2 stops19h 43m
Multiple Airlines
Deal found 6/1$804
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 8/73:05 pm
ISP
-
YUL
2 stops21h 05m
Multiple Airlines
Mon 8/107:20 pm
YUL
-
ISP
1 stop15h 36m
Multiple Airlines
Deal found 6/1$821
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 8/610:00 am
ISP
-
YUL
1 stop8h 15m
Multiple Airlines
Mon 8/107:20 pm
YUL
-
ISP
1 stop15h 36m
Multiple Airlines
Deal found 6/1$822

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 June 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$495
(Kiwi.com)

One-way from

$341
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$268
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. 7% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 4, 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 7/1

9:52 pm-4:45 pm

1 stop18h 53m

Toronto Pearson Intl

Tue 7/7

3:20 pm-9:53 am

2 stops18h 33m

$649

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sun 6/28

9:52 pm-8:05 pm

1 stop22h 13m

Toronto Pearson Intl

Sun 7/5

4:50 pm-9:53 am

1 stop17h 03m

$649

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Tue 6/30

4:41 pm-8:05 pm

1 stop27h 24m

Toronto Pearson Intl

Tue 7/7

3:20 pm-9:53 am

2 stops18h 33m

$660

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Thu 7/30

2:11 pm-10:05 pm

1 stop7h 54m

Toronto Pearson Intl

Sun 8/2

9:50 am-9:53 am

1 stop24h 03m

$716

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Mon 7/13

2:28 pm-8:05 pm

2 stops29h 37m

Toronto Pearson Intl

Mon 7/20

8:10 am-7:01 pm

1 stop10h 51m

$749

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Thu 6/18

9:52 pm-4:45 pm

1 stop18h 53m

Toronto Pearson Intl

Sun 6/21

7:45 am-8:57 pm

1 stop13h 12m

$757

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Tue 6/30

10:00 am-4:53 pm

1 stop6h 53m

Ottawa

Tue 7/7

2:10 pm-9:53 am

2 stops19h 43m

$804

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 8/7

3:05 pm-10:05 pm

1 stop7h 00m

Toronto Pearson Intl

Sun 8/9

9:50 am-9:53 am

1 stop24h 03m

$813

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 8/7

3:05 pm-12:10 pm

2 stops21h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 8/10

7:20 pm-10:56 am

1 stop15h 36m

$821
Quickest round-trip

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 8/6

10:00 am-6:15 pm

1 stop8h 15m

Montreal Pierre Elliott Trudeau Intl

Mon 8/10

7:20 pm-10:56 am

1 stop15h 36m

$822

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/1

Showing 1-10 of 19 resultsSorted by cheapest first
1
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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 - 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.

See more FAQs

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