$339+ 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 6/26. 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
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 11, 2025.
Popular in | December |
|---|---|
Cheapest in | May |
Average price | $227 |
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 11, 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 11, 2025.
This Mytrip deal was found by Cheapflights users on 6/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Islip 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 June 11, 2025.
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
MontrealIslip
YUL - ISP
YULISP
Montreal Pierre Elliott Trudeau Intl
Thu 6/26
6:45 am-7:36 pm
1 stop12h 51m
TorontoIslip
YYZ - ISP
YYZISP
Toronto Pearson Intl
Sat 6/14
6:30 am-6:59 pm
2 stops36h 29m
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?
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.
Rainfall in Islip by month
Plan your trip to Islip by taking into account the average rainfall totals by month.
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.
Temperature in Islip by month
Plan your trip to Islip by taking into account the average temperature totals by month.
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).