Find cheap flights from Ontario to Islip

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

Round-trip
One way

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to book flights from Ontario to Islip?

We monitor flight fares to help you find the best deals effortlessly

Cheapest flights

From price

May

27 4
4 11
11 18
18 25
Jun

25 1
1 8
8 15
15 22
22 29
Jul

29 6
6 13
13 20

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

When are flight tickets from Ontario (ONT) to Islip (ISP) the cheapest?

Airlines adjust prices for flights from Ontario to Islip based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much do flights from Ontario (ONT) to Islip (ISP) cost?

According to Trip.com's data, the lowest price is around $459.

How to find a cheap flight from Ontario to Islip

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ontario to Islip. Book your flights at the right time and save more.

Being flexible with your dates to get the cheapest Ontario to Islip ticket.

Tap "Date" on flight search bar to scan through the calender for Ontario to Islip airfare over next 6 months in 2025.

Compare cheap Ontario to Islip flight deals from over hundreds of airlines.

Our extensive search allows you to compare prices from over 500 airlines to choose the cheapest flight tickets from Ontario to Islip.

Set up a Price Alert

By setting up a Price Alert for your Ontario to Islip route, you can easily track the price of your airline tickets from Ontario to Islip without manually checking every day.

Don't miss cheap Ontario to Islip flight deals and promo codes.

You can always get the latest deals through Trip.com Deals and Promo Codes for cheap flights for cheap flights. If registering a free membership, you can receive more deals for your flights.

Book early or wait unitl the last minute.

It's always better to book early. Flight tickets tend to be the cheapest when they are first released, normally about a year before the departure date. So, check online as soon as the flights you want become available. If you miss the cheapest time, you can still find lower-priced tickets as the flight date approaches.

Search for flights on the go.

To get the best flight booking experience on the go, download Trip.com free app and search for cheap flight tickets from Ontario to Islip to get exclusive deals for you.