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$187+ 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 6/14. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Jun 7 — Jun 141
Sun 6/7
Sun 6/14
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 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Sat 6/209:52 pm
ISP
-
YYZ
1 stop25h 43m
Multiple Airlines
Sat 6/276:15 am
YYZ
-
ISP
2 stops11h 14m
Multiple Airlines
Deal found 5/6$571
This Kiwi.com deal was found by Cheapflights users on 5/2. 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.
Sun 5/249:59 am
ISP
-
YUL
1 stop8h 16m
Multiple Airlines
Fri 5/296:45 am
YUL
-
ISP
2 stops27h 20m
Multiple Airlines
Deal found 5/2$613
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 6/198:31 pm
ISP
-
YYZ
1 stop24h 09m
Multiple Airlines
Fri 6/264:50 pm
YYZ
-
ISP
1 stop28h 07m
Multiple Airlines
Deal found 5/5$617
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 6/209:52 pm
ISP
-
YOW
2 stops26h 33m
Multiple Airlines
Sat 6/277:00 am
YOW
-
ISP
1 stop13h 57m
Multiple Airlines
Deal found 5/5$623
This Kiwi.com deal was found by Cheapflights users on 5/5. 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
-
YYZ
1 stop29h 45m
Multiple Airlines
Sun 6/75:45 pm
YYZ
-
ISP
1 stop16h 20m
Multiple Airlines
Deal found 5/5$678
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 6/1712:30 pm
ISP
-
YYZ
2 stops7h 14m
Multiple Airlines
Thu 6/189:50 am
YYZ
-
ISP
1 stop11h 07m
Multiple Airlines
Deal found 5/7$681
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 6/139:52 pm
ISP
-
YUL
2 stops42h 53m
Multiple Airlines
Sat 6/207:20 pm
YUL
-
ISP
1 stop15h 45m
Multiple Airlines
Deal found 5/3$681
This Kiwi.com deal was found by Cheapflights users on 5/4. 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 6/189:52 pm
ISP
-
YOW
1 stop16h 41m
Multiple Airlines
Thu 6/256:55 am
YOW
-
ISP
2 stops36h 56m
Multiple Airlines
Deal found 5/4$696
This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Fri 6/59:59 am
ISP
-
YUL
1 stop8h 16m
Multiple Airlines
Fri 6/126:45 am
YUL
-
ISP
2 stops14h 12m
Multiple Airlines
Deal found 5/6$723
This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Sat 6/209:52 pm
ISP
-
YYZ
1 stop22h 13m
Multiple Airlines
Tue 6/233:55 pm
YYZ
-
ISP
1 stop19h 10m
Multiple Airlines
Deal found 5/6$740
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 5/239:59 am
ISP
-
YYZ
1 stop26h 01m
Multiple Airlines
Thu 5/285:50 pm
YYZ
-
ISP
2 stops40h 15m
Multiple Airlines
Deal found 5/5$748
This Kiwi.com deal was found by Cheapflights users on 5/6. 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.
Wed 5/207:25 am
ISP
-
YYZ
2 stops12h 20m
Multiple Airlines
Fri 5/224:50 pm
YYZ
-
ISP
1 stop17h 15m
Multiple Airlines
Deal found 5/6$750

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 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$571
(Kiwi.com)

One-way from

$187
(Kiwi.com)

Popular in

December

Cheapest in

June

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
One-way flight from Islip Long Island to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($32 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 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 8, 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

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Sun 5/24

9:59 am-6:15 pm

1 stop8h 16m

Montreal Pierre Elliott Trudeau Intl

Fri 5/29

6:45 am-10:05 am

2 stops27h 20m

$613

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 6/19

8:31 pm-8:40 pm

1 stop24h 09m

Toronto Pearson Intl

Fri 6/26

4:50 pm-8:57 pm

1 stop28h 07m

$617

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Sat 6/20

9:52 pm-12:25 am

2 stops26h 33m

Ottawa

Sat 6/27

7:00 am-8:57 pm

1 stop13h 57m

$623

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 6/5

11:00 am-4:45 pm

1 stop29h 45m

Toronto Pearson Intl

Sun 6/7

5:45 pm-10:05 am

1 stop16h 20m

$678

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 6/17

12:30 pm-8:30 pm

1 stop8h 00m

Toronto Pearson Intl

Thu 6/18

7:45 am-8:57 pm

1 stop13h 12m

$681

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Sat 6/13

9:52 pm-4:45 pm

2 stops42h 53m

Montreal Pierre Elliott Trudeau Intl

Sat 6/20

7:20 pm-11:05 am

1 stop15h 45m

$681

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Thu 6/18

9:52 pm-2:33 pm

1 stop16h 41m

Ottawa

Thu 6/25

6:55 am-7:51 pm

2 stops36h 56m

$696

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 6/5

9:59 am-6:15 pm

1 stop8h 16m

Montreal Pierre Elliott Trudeau Intl

Fri 6/12

6:45 am-8:57 pm

2 stops14h 12m

$723

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 6/20

9:52 pm-8:05 pm

1 stop22h 13m

Toronto Pearson Intl

Tue 6/23

3:55 pm-11:05 am

1 stop19h 10m

$740

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 5/23

9:59 am-12:00 pm

1 stop26h 01m

Toronto Pearson Intl

Thu 5/28

5:50 pm-10:05 am

2 stops40h 15m

$748

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/4

Showing 1-10 of 23 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 - 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

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