HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$412+ 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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
May 11 — May 181
Mon 5/11
Mon 5/18
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 11, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/10. 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 5/266:02 pm
ISP
-
YYZ
1 stop22h 43m
Multiple Airlines
Tue 6/29:50 am
YYZ
-
ISP
1 stop24h 15m
Multiple Airlines
Deal found 4/10$412
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 4/164:07 pm
ISP
-
YYZ
1 stop22h 13m
Multiple Airlines
Thu 4/238:00 pm
YYZ
-
ISP
1 stop23h 36m
Multiple Airlines
Deal found 4/6$419
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 4/2211:50 am
ISP
-
YYZ
2 stops12h 24m
Multiple Airlines
Sun 4/262:20 pm
YYZ
-
ISP
1 stop29h 16m
Multiple Airlines
Deal found 4/7$453
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 4/244:07 pm
ISP
-
YYZ
1 stop19h 39m
Multiple Airlines
Mon 4/276:30 am
YYZ
-
ISP
2 stops13h 06m
Multiple Airlines
Deal found 4/10$485
This Kiwi.com deal was found by Cheapflights users on 4/7. 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
-
YOW
2 stops39h 32m
Multiple Airlines
Fri 5/297:00 am
YOW
-
ISP
1 stop27h 05m
Multiple Airlines
Deal found 4/7$536
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 5/236:09 pm
ISP
-
YYZ
2 stops17h 26m
Multiple Airlines
Sat 5/307:45 am
YYZ
-
ISP
1 stop26h 20m
Multiple Airlines
Deal found 4/8$544
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 6/2010:48 am
ISP
-
YYZ
1 stop9h 17m
Multiple Airlines
Sun 6/214:50 pm
YYZ
-
ISP
1 stop17h 13m
Multiple Airlines
Deal found 4/10$565
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 4/2511:50 am
ISP
-
YYZ
2 stops9h 10m
Multiple Airlines
Sun 4/268:20 pm
YYZ
-
ISP
1 stop13h 08m
Multiple Airlines
Deal found 4/10$583
This Kiwi.com deal was found by Cheapflights users on 4/11. 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 5/96:43 pm
ISP
-
YYZ
1 stop20h 12m
Multiple Airlines
Sat 5/163:20 pm
YYZ
-
ISP
2 stops19h 07m
Multiple Airlines
Deal found 4/11$610
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/229:59 am
ISP
-
YYZ
1 stop10h 31m
Multiple Airlines
Fri 5/294:50 pm
YYZ
-
ISP
1 stop17h 15m
Multiple Airlines
Deal found 4/7$657
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 5/257:25 am
ISP
-
YOW
1 stop9h 25m
Multiple Airlines
Mon 6/110:10 am
YOW
-
ISP
2 stops30h 37m
Multiple Airlines
Deal found 4/10$699
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 5/257:25 am
ISP
-
YUL
1 stop10h 50m
Multiple Airlines
Mon 6/17:15 pm
YUL
-
ISP
2 stops38h 50m
Multiple Airlines
Deal found 4/10$720

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 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$412
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$261
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
Highest demand for flights based on searches. 10% potential increase in price ($34 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 11, 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

Tue 5/26

6:02 pm-4:45 pm

1 stop22h 43m

Toronto Pearson Intl

Tue 6/2

9:50 am-10:05 am

1 stop24h 15m

$412

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 4/22

11:50 am-12:14 am

2 stops12h 24m

Toronto Pearson Intl

Sun 4/26

2:20 pm-7:36 pm

1 stop29h 16m

$453

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 4/24

4:07 pm-11:46 am

1 stop19h 39m

Toronto Pearson Intl

Mon 4/27

6:30 am-7:36 pm

2 stops13h 06m

$485

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Fri 5/22

8:43 pm-12:15 pm

2 stops39h 32m

Ottawa

Fri 5/29

7:00 am-10:05 am

1 stop27h 05m

$536

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 5/23

6:09 pm-11:35 am

2 stops17h 26m

Toronto Pearson Intl

Sat 5/30

7:45 am-10:05 am

1 stop26h 20m

$544
Quickest round-trip

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 4/25

11:50 am-9:00 pm

2 stops9h 10m

Toronto Pearson Intl

Sun 4/26

8:20 pm-9:28 am

1 stop13h 08m

$583

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 5/9

6:43 pm-2:55 pm

1 stop20h 12m

Toronto Pearson Intl

Sat 5/16

3:20 pm-10:27 am

2 stops19h 07m

$610

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 5/22

9:59 am-8:30 pm

1 stop10h 31m

Toronto Pearson Intl

Fri 5/29

4:50 pm-10:05 am

1 stop17h 15m

$657

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Mon 5/25

7:25 am-4:50 pm

1 stop9h 25m

Ottawa

Mon 6/1

10:10 am-4:47 pm

2 stops30h 37m

$699

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 5/22

12:30 pm-6:15 pm

1 stop5h 45m

Montreal Pierre Elliott Trudeau Intl

Fri 5/29

7:15 pm-5:29 pm

2 stops22h 14m

$747

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/7

Showing 1-10 of 14 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

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 $85). Flying from Islip, New York to Region of Ontario in March is currently the most expensive (average of $129). 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 $85). Flying from Islip, New York to Region of Ontario in March is currently the most expensive (average of $129). 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

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