HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$165+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
May 29 — Jun 51
Fri 5/29
Fri 6/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/28. 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 6/1210:48 am
ISP
-
YOW
2 stops13h 32m
Multiple Airlines
Fri 6/197:00 am
YOW
-
ISP
1 stop27h 03m
Multiple Airlines
Deal found 4/28$375
This Kiwi.com deal was found by Cheapflights users on 4/26. 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.
Thu 6/1110:48 am
ISP
-
YYZ
1 stop29h 57m
Multiple Airlines
Thu 6/189:50 am
YYZ
-
ISP
1 stop24h 13m
Multiple Airlines
Deal found 4/26$392
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Wed 5/2711:00 am
ISP
-
YYZ
2 stops27h 05m
Multiple Airlines
Wed 6/39:50 am
YYZ
-
ISP
1 stop24h 15m
Multiple Airlines
Deal found 4/27$399
This Kiwi.com deal was found by Cheapflights users on 4/26. 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.
Wed 8/197:41 pm
ISP
-
YYZ
1 stop24h 59m
Multiple Airlines
Sun 8/234:50 pm
YYZ
-
ISP
1 stop17h 13m
Multiple Airlines
Deal found 4/26$408
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Tue 6/97:18 pm
ISP
-
YYZ
2 stops25h 12m
Multiple Airlines
Tue 6/169:50 am
YYZ
-
ISP
1 stop24h 13m
Multiple Airlines
Deal found 4/25$430
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 6/128:31 pm
ISP
-
YYZ
1 stop24h 09m
Multiple Airlines
Fri 6/199:50 am
YYZ
-
ISP
1 stop24h 13m
Multiple Airlines
Deal found 4/28$445
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Fri 5/1511:00 am
ISP
-
YYZ
2 stops32h 35m
Multiple Airlines
Wed 5/209:50 am
YYZ
-
ISP
1 stop24h 37m
Multiple Airlines
Deal found 4/29$471
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Fri 5/1511:00 am
ISP
-
YYZ
2 stops25h 00m
Multiple Airlines
Tue 5/199:50 am
YYZ
-
ISP
1 stop24h 15m
Multiple Airlines
Deal found 4/29$481
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 6/1112:30 pm
ISP
-
YUL
1 stop5h 45m
Multiple Airlines
Thu 6/186:45 am
YUL
-
ISP
2 stops27h 18m
Multiple Airlines
Deal found 4/27$680
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Thu 6/49:59 am
ISP
-
YUL
1 stop8h 16m
Multiple Airlines
Sun 6/76:45 am
YUL
-
ISP
2 stops27h 20m
Multiple Airlines
Deal found 4/29$695
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Mon 5/1811:00 am
ISP
-
YOW
2 stops49h 15m
Multiple Airlines
Thu 5/282:30 pm
YOW
-
ISP
1 stop5h 15m
Multiple Airlines
Deal found 4/28$697
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Mon 6/811:00 am
ISP
-
YOW
2 stops13h 20m
Multiple Airlines
Fri 6/127:00 am
YOW
-
ISP
1 stop13h 57m
Multiple Airlines
Deal found 4/29$704

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 April 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$375
(Kiwi.com)

One-way from

$165
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$269
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. 10% potential increase in price ($33 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 April 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 April 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

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Fri 6/12

10:48 am-12:20 am

2 stops13h 32m

Ottawa

Fri 6/19

7:00 am-10:03 am

1 stop27h 03m

$375

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 5/27

11:00 am-2:05 pm

2 stops27h 05m

Toronto Pearson Intl

Wed 6/3

9:50 am-10:05 am

1 stop24h 15m

$399

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 8/19

7:41 pm-8:40 pm

1 stop24h 59m

Toronto Pearson Intl

Sun 8/23

4:50 pm-10:03 am

1 stop17h 13m

$408

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Thu 6/11

10:48 am-4:45 pm

1 stop29h 57m

Toronto Pearson Intl

Thu 6/18

4:45 pm-10:03 am

2 stops17h 18m

$435

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 6/12

8:31 pm-8:40 pm

1 stop24h 09m

Toronto Pearson Intl

Fri 6/19

9:50 am-10:03 am

1 stop24h 13m

$445

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 8/5

7:41 pm-8:40 pm

1 stop24h 59m

Toronto Pearson Intl

Mon 8/10

8:10 am-8:03 pm

2 stops11h 53m

$445

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 8/7

10:48 am-11:35 pm

1 stop12h 47m

Toronto Pearson Intl

Mon 8/10

8:10 am-8:03 pm

2 stops11h 53m

$509

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sun 8/2

10:48 am-11:35 pm

1 stop12h 47m

Toronto Pearson Intl

Mon 8/10

8:10 am-1:28 pm

2 stops29h 18m

$543

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 5/15

9:59 am-12:00 pm

1 stop26h 01m

Toronto Pearson Intl

Tue 5/19

9:50 am-10:05 am

1 stop24h 15m

$582

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 5/15

9:59 am-12:00 pm

1 stop26h 01m

Toronto Pearson Intl

Wed 5/20

9:50 am-10:27 am

1 stop24h 37m

$603

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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 - 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights