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$108+ Cheap flights from Islip (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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Islip to Ontario

Keep the following information in mind while searching for Islip to Ontario flight deals. Data was last updated September 17, 2025.

Round-trip from

$359
(Kiwi.com)

One-way from

$108
(Trip.com)

Popular in

November

Cheapest in

May

Average price

$269
From Islip Long Island to Ontario
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One-way flight from Islip Long Island to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/154:58 pmISP - YYZ
1 stop20h 54mMultiple Airlines
Wed 10/226:30 amYYZ - ISP
2 stops38h 12mMultiple Airlines
Deal found 9/16$359
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/314:58 pmISP - YUL
2 stops31h 45mMultiple Airlines
Fri 11/74:35 pmYUL - ISP
1 stop18h 02mMultiple Airlines
Deal found 9/16$462
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 9/205:05 pmISP - YYZ
1 stop30h 36mMultiple Airlines
Mon 9/229:50 amYYZ - ISP
1 stop24h 50mMultiple Airlines
Deal found 9/16$570
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/195:05 pmISP - YYZ
1 stop30h 36mMultiple Airlines
Mon 9/229:50 amYYZ - ISP
1 stop24h 50mMultiple Airlines
Deal found 9/15$611
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/104:58 pmISP - YYZ
2 stops19h 12mMultiple Airlines
Sun 10/129:50 amYYZ - ISP
1 stop11h 02mMultiple Airlines
Deal found 9/16$703
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Fri 10/1712:40 pmISP - YOW
1 stop4h 18mMultiple Airlines
Sun 10/194:05 pmYOW - ISP
2 stops21h 40mMultiple Airlines
Deal found 9/17$784
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/1711:35 amISP - YYZ
2 stops26h 30mMultiple Airlines
Sun 9/218:00 pmYYZ - ISP
1 stop14h 40mMultiple Airlines
Deal found 9/15$801
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 9/1811:40 amISP - YYZ
2 stops20h 15mMultiple Airlines
Sun 9/219:50 amYYZ - ISP
1 stop24h 50mMultiple Airlines
Deal found 9/16$900
This United deal was found by Cheapflights users on 9/16. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/147:30 amISP - YUL
1 stop4h 15mMultiple Airlines
Tue 10/211:05 pmYUL - ISP
1 stop6h 40mMultiple Airlines
Deal found 9/16$2,533
This United deal was found by Cheapflights users on 9/16. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1311:53 amISP - YUL
1 stop8h 07mMultiple Airlines
Mon 10/208:05 amYUL - ISP
1 stop8h 10mMultiple Airlines
Deal found 9/16$2,593

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 September 17, 2025.
Use the filters below to find and compare flights from Islip to Ontario that are best for you.

Fly from

Islip

Fly to

Ontario

Route

Depart

Return

Price

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 10/15

4:58 pm-1:52 pm

1 stop20h 54m

Toronto Pearson Intl

Wed 10/22

6:30 am-8:42 pm

2 stops38h 12m

$359

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 10/31

4:58 pm-12:43 am

2 stops31h 45m

Montreal Pierre Elliott Trudeau Intl

Fri 11/7

4:35 pm-10:37 am

1 stop18h 02m

$462

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 2/11

11:50 am-12:30 am

2 stops12h 40m

Montreal Pierre Elliott Trudeau Intl

Tue 2/17

4:35 pm-10:40 am

1 stop18h 05m

$537

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 2/11

11:50 am-12:30 am

2 stops12h 40m

Montreal Pierre Elliott Trudeau Intl

Sun 2/15

4:35 pm-10:40 am

1 stop18h 05m

$566

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 9/20

5:05 pm-11:41 pm

1 stop30h 36m

Toronto Pearson Intl

Mon 9/22

9:50 am-10:40 am

1 stop24h 50m

$570

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 2/11

11:50 am-12:30 am

2 stops12h 40m

Montreal Pierre Elliott Trudeau Intl

Mon 2/16

6:45 am-12:31 am

1 stop17h 46m

$587

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 2/12

11:45 am-12:30 am

2 stops12h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 2/17

4:35 pm-10:40 am

1 stop18h 05m

$615

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 2/12

11:45 am-12:30 am

2 stops12h 45m

Montreal Pierre Elliott Trudeau Intl

Mon 2/16

8:00 am-12:31 am

1 stop16h 31m

$672

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 10/10

4:58 pm-12:10 pm

2 stops19h 12m

Toronto Pearson Intl

Sun 10/12

9:50 am-8:52 pm

1 stop11h 02m

$703

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Fri 10/17

12:40 pm-4:58 pm

1 stop4h 18m

Ottawa

Sun 10/19

4:05 pm-1:45 pm

2 stops21h 40m

$784

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 11 results
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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

What is the cheapest month to book a flight from Islip to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Islip to Region of Ontario (average of $243). Flying from Islip to Region of Ontario in August is currently the most expensive (average of $348). 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 to Region of Ontario?

    The most popular flight routes from Islip 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 to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Islip to Region of Ontario (average of $243). Flying from Islip to Region of Ontario in August is currently the most expensive (average of $348). 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

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Alternative routes for Islip to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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