In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What are the most popular routes from Region of Ontario to Islip, New York?

The most popular flight routes from Region of Ontario to Islip, New York are Toronto Pearson Intl - Islip Long Island, Ottawa - Islip Long Island and Montreal Pierre Elliott Trudeau Intl - Islip Long Island.

How far in advance should I book a flight from Region of Ontario to Islip, New York?

Travelers have found it’s best to book a flight 32 days in advance to save up to 60% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 32 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Region of Ontario to Islip, New York 1-2 weeks in advance for as low as $235, or $359 for flights within the next 24 hours.

What is the cheapest month to fly from Region of Ontario to Islip, New York?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, May can be a great choice for travel to Islip, New York. Flights to Islip, New York from Region of Ontario in May are about $223 on average during May, but can be found for as low as $118.

What is the cheapest time of day to fly from ON to ISP?

When flying from Region of Ontario to Islip, New York, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly into for flights to Islip from Ontario?

Most people fly into Islip Long Island (ISP) if they book a flight to Islip from Ontario. Long Island is conveniently located just 7.2 mi from Islip’s city center.

Can I find deals for flights from Ontario to Islip that include hotel bookings?

Yes. In addition to deals on Ontario to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Islip?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Islip.

Can I find deals for business class flights from Ontario to Islip?

Yes. Cheapflights offers flight deals from Ontario to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$262+ Flights from Ontario to Islip, NY

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Cheap flight deals from Ontario to Islip

Round-trip from	$463 (Kiwi.com)
One-way from	$262 (Kiwi.com)
Popular in	December
Cheapest in	May
Average price	$229

From Ontario to Islip Long Island

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One-way flight from Ontario to Islip Long Island

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Highest demand for flights based on searches. 4% potential increase in price ($10 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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Find flight deals from Ontario to Islip

Cheapest flights from Ontario to Islip
Explore the most affordable flight options available from Ontario to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 26, 2025.

Tue 8/267:15 amYYZ - ISP

1 stop16h 44mMultiple Airlines

Fri 8/2910:44 amISP - YYZ

2 stops10h 39mMultiple Airlines

Deal found 6/25

$463

Sun 8/104:25 pmYOW - ISP

1 stop27h 27mMultiple Airlines

Sun 8/174:33 pmISP - YOW

1 stop24h 25mMultiple Airlines

Deal found 6/26

$708

Best flights from Ontario to Islip
Discover carefully curated flight deals from Ontario to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 26, 2025.

Tue 8/267:15 amYYZ - ISP

1 stop16h 44mMultiple Airlines

Fri 8/2910:44 amISP - YYZ

2 stops10h 39mMultiple Airlines

Deal found 6/25

$463

Sun 8/104:25 pmYOW - ISP

1 stop27h 27mMultiple Airlines

Sun 8/174:33 pmISP - YOW

1 stop24h 25mMultiple Airlines

Deal found 6/26

$708

Last-minute flights from Ontario to Islip
Discover last-minute flight deals from Ontario to Islip. Data last updated June 26, 2025 and is based on user searches.

Fri 7/189:50 amYYZ - ISP

1 stop9h 52mMultiple Airlines

Sun 7/206:00 amISP - YYZ

2 stops15h 30mMultiple Airlines

Deal found 6/23

$810

One-way flights from Ontario to Islip
Search for one-way flight options from Ontario to Islip. Find affordable one-way fares based on user searches. Data last updated June 26, 2025.

Thu 8/79:50 amYYZ - ISP

1 stop13h 57mMultiple Airlines

Deal found 6/25

$262

Mon 7/2810:45 amYUL - ISP

2 stops9h 16mMultiple Airlines

Deal found 6/25

$572

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

TorontoIslip

YYZ - ISP

YYZISP

Toronto Pearson Intl

Tue 8/26

7:15 am-11:59 pm

1 stop16h 44m

Islip Long Island

Fri 8/29

10:44 am-9:23 pm

2 stops10h 39m

$463

OttawaIslip

YOW - ISP

YOWISP

Ottawa

Sun 8/10

4:25 pm-7:52 pm

1 stop27h 27m

Islip Long Island

Sun 8/17

4:33 pm-4:58 pm

1 stop24h 25m

$708

TorontoIslip

YYZ - ISP

YYZISP

Toronto Pearson Intl

Thu 8/7

9:50 am-11:47 pm

1 stop13h 57m

$262

MontrealIslip

YUL - ISP

YULISP

Montreal Pierre Elliott Trudeau Intl

Mon 7/28

10:45 am-8:01 pm

2 stops9h 16m

$572

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/25

Best time to book a flight from Ontario to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Ontario 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 Ontario to Islip

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

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Islip, New York (average of $108). Flying from Region of Ontario to Islip, New York in November is currently the most expensive (average of $213). 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

What airport do you fly into for flights to Islip from Ontario?
Most people fly into Islip Long Island (ISP) if they book a flight to Islip from Ontario. Long Island is conveniently located just 7.2 mi from Islip’s city center.
What are the most popular routes from Region of Ontario to Islip, New York?
The most popular flight routes from Region of Ontario to Islip, New York are Toronto Pearson Intl - Islip Long Island, Ottawa - Islip Long Island and Montreal Pierre Elliott Trudeau Intl - Islip Long Island.
Can I find deals for flights from Ontario to Islip that include hotel bookings?
Yes. In addition to deals on Ontario to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Islip.
Can I find deals for business class flights from Ontario to Islip?
Yes. Cheapflights offers flight deals from Ontario to Islip 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 Region of Ontario to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Islip, New York (average of $108). Flying from Region of Ontario to Islip, New York in November is currently the most expensive (average of $213). 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.

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$262+ Cheap flights from Ontario to Islip, NY (ISP)

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 8/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Islip with Cheapflights

1. Tell us where you want to go

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3. Compare prices and book

Cheap flight deals from Ontario to Islip

Keep the following information in mind while searching for Ontario to Islip flight deals. Data was last updated June 26, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Islip

Cheapest flights from Ontario to IslipExplore the most affordable flight options available from Ontario to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 26, 2025.

Explore the most affordable flight options available from Ontario to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 26, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Ontario to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Islip

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

Related info for your journey

Find useful and relevant information for your journey from Ontario to Islip. 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 into for flights to Islip from Ontario?

What are the most popular routes from Region of Ontario to Islip, New York?

Can I find deals for flights from Ontario to Islip that include hotel bookings?

How can I find direct flights from Ontario to Islip?

Can I find deals for business class flights from Ontario to Islip?

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

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Cheapest flights from Ontario to Islip
Explore the most affordable flight options available from Ontario to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 26, 2025.