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$285+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Jul 30 — Aug 61
Wed 7/30
Wed 8/6
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 July 25, 2025.

Round-trip from

$506
(Kiwi.com)

One-way from

$285
(Kiwi.com)

Popular in

November

Cheapest in

May

Average price

$270
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. 13% potential increase in price ($40 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 July 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 July 25, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/106:00 amISP - YYZ
1 stop17h 47mMultiple Airlines
Tue 8/127:15 amYYZ - ISP
1 stop14h 43mMultiple Airlines
Deal found 7/22$661
This Trip.com deal was found by Cheapflights users on 7/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/118:38 pmISP - YUL
2 stops27h 49mMultiple Airlines
Mon 8/186:45 amYUL - ISP
2 stops41h 14mMultiple Airlines
Deal found 7/24$775

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 July 25, 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

Sun 8/10

6:00 am-11:47 pm

1 stop17h 47m

Toronto Pearson Intl

Tue 8/12

7:15 am-9:58 pm

1 stop14h 43m

$661

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Mon 8/11

8:38 pm-12:27 am

2 stops27h 49m

Montreal Pierre Elliott Trudeau Intl

Mon 8/18

6:45 am-11:59 pm

2 stops41h 14m

$775

IslipOttawa

ISP - YOW

ISPYOW

Islip Long Island

Fri 8/15

10:44 am-12:22 am

3 stops13h 38m

$285

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sun 8/10

6:00 am-11:47 pm

1 stop17h 47m

$346

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

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, January is the cheapest month in which you can book a flight from Islip, New York to Region of Ontario (average of $243). Flying from Islip, New York 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, 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, January is the cheapest month in which you can book a flight from Islip, New York to Region of Ontario (average of $243). Flying from Islip, New York 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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