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$288+ 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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
Tue 12/2312:20 pmISP - YUL
1 stop12h 10mMultiple Airlines
Thu 1/86:45 amYUL - ISP
2 stops13h 00mMultiple Airlines
Deal found 12/15$594

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 December 18, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$288
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$331
Provider with most accurate pricing for New York (NYC)-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Toronto (YTO) flights.
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From Islip Long Island to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 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

Fri 1/30

7:20 pm-8:11 pm

2 stops24h 51m

Toronto Pearson Intl

Fri 2/6

7:10 am-8:47 pm

1 stop13h 37m

$288

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 1/31

7:35 pm-2:53 pm

1 stop19h 18m

Toronto Pearson Intl

Sat 2/7

7:10 am-8:40 am

1 stop25h 30m

$300

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 3/25

8:32 am-10:15 pm

1 stop13h 43m

Toronto Pearson Intl

Sun 4/26

1:30 pm-10:55 am

1 stop21h 25m

$392

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Tue 12/23

12:20 pm-12:30 am

1 stop12h 10m

$344

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

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 $83). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of $148). 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 - Montreal Pierre Elliott Trudeau Intl, Islip Long Island - Toronto Pearson 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 $83). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of $148). 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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