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Flights from Ontario to Islip
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.
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Round-trip
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One way
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ONT 00:5916h 10m2 stopsISP 20:09Ontario - Islip | Tue, Apr 8 | Frontier AirlinesISP 21:0425h 14m1 stopsSIN 19:18Islip - Ontario | Tue, Apr 15 | Frontier AirlinesUS$249 US$55955% OFF55% OFFUS$559 US$249
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ONT 14:0616h 54m2 stopsISP 10:00Ontario - Islip | Mon, Apr 28 | Frontier AirlinesISP 18:5119h 35m2 stopsSIN 11:26Islip - Ontario | Tue, May 6 | Frontier AirlinesUS$251 US$55955% OFF55% OFFUS$559 US$251
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ONT 16:2524h 44m2 stopsISP 20:09Ontario - Islip | Mon, Apr 7 | Frontier AirlinesISP 21:0453h 55m2 stopsSIN 23:59Islip - Ontario | Mon, Apr 14 | Frontier AirlinesUS$302 US$55946% OFF46% OFFUS$559 US$302
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ONT 00:5934h 29m2 stopsISP 14:28Ontario - Islip | Fri, Apr 11 | Frontier AirlinesISP 21:0425h 14m1 stopsSIN 19:18Islip - Ontario | Mon, Apr 14 | Frontier AirlinesUS$31144% OFFUS$559 US$311
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ONT 00:4928h 21m2 stopsISP 08:10Ontario - Islip | Sat, Apr 12 | Frontier AirlinesISP 15:1835h 41m2 stopsSIN 23:59Islip - Ontario | Sat, Apr 19 | Frontier AirlinesUS$32143% OFFUS$559 US$321
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ONT 00:5928h 45m2 stopsISP 08:44Ontario - Islip | Tue, Apr 15 | Frontier AirlinesISP 18:5139h 34m2 stopsSIN 07:25Islip - Ontario | Tue, Apr 22 | Frontier AirlinesUS$32742% OFFUS$559 US$327
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ONT 00:5928h 11m2 stopsISP 08:10Ontario - Islip | Wed, Apr 16 | Frontier AirlinesISP 18:5130h 14m2 stopsSIN 22:05Islip - Ontario | Wed, Apr 23 | Frontier AirlinesUS$33840% OFFUS$559 US$338
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ONT 21:0920h2 stopsISP 20:09Ontario - Islip | Wed, Apr 9 | Frontier AirlinesISP 09:4412h 34m1 stopsSIN 19:18Islip - Ontario | Wed, Apr 16 | Frontier AirlinesUS$35237% OFFUS$559 US$352
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ONT 14:0616h 54m2 stopsISP 10:00Ontario - Islip | Sun, Apr 27 | Frontier AirlinesISP 06:0010h 25m1 stopsSIN 13:25Islip - Ontario | Sun, May 4 | Jetblue AirwaysUS$39828% OFFUS$559 US$398
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ONT 21:4113h 47m2 stopsISP 14:28Ontario - Islip | Fri, Apr 4 | Frontier AirlinesISP 09:0713h 11m1 stopsSIN 19:18Islip - Ontario | Sun, Apr 6 | Frontier AirlinesUS$46417% OFFUS$559 US$464
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ONT 13:0017h 25m1 stopsISP Invalid DateOntario - Islip | Fri, Apr 4 | Normal AirlineISP 15:006hNonstopONT 16:00Islip - Ontario | Sun, Apr 6 | Normal AirlineFind More FlightsFind More Flights
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ONT 00:5935h 42m2 stopsISP 15:41Ontario - Islip | Thu, Apr 3 | Frontier AirlinesUS$148 US$34756% OFF56% OFFUS$347 US$148
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ONT 00:5935h 24m2 stopsISP 15:23Ontario - Islip | Tue, Apr 22 | Frontier AirlinesUS$169 US$34751% OFF51% OFFUS$347 US$169
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ONT 20:4513h 33m2 stopsISP 13:18Ontario - Islip | Thu, Apr 24 | Frontier AirlinesUS$177 US$34749% OFF49% OFFUS$347 US$177
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ONT 12:1024h 13m2 stopsISP 15:23Ontario - Islip | Wed, Apr 23 | Frontier AirlinesUS$21438% OFFUS$347 US$214
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ONT 13:3018h 40m2 stopsISP 11:10Ontario - Islip | Wed, Apr 9 | Delta Air LinesUS$25427% OFFUS$347 US$254
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ONT 06:1030h 13m2 stopsISP 15:23Ontario - Islip | Mon, Apr 28 | United AirlinesUS$27222% OFFUS$347 US$272
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ONT 08:3920h 31m2 stopsISP 08:10Ontario - Islip | Sat, Apr 5 | Frontier AirlinesUS$27321% OFFUS$347 US$273
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ONT 06:0816h 10m2 stopsISP 01:18Ontario - Islip | Sat, May 10 | United AirlinesUS$27920% OFFUS$347 US$279
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ONT 05:0517h 23m2 stopsISP 01:28Ontario - Islip | Wed, May 7 | United AirlinesUS$28717% OFFUS$347 US$287
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ONT 21:4113h 47m2 stopsISP 14:28Ontario - Islip | Fri, Apr 4 | Frontier AirlinesUS$28817% OFFUS$347 US$288
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ONT 13:0017h 25m1 stopsISP Invalid DateOntario - Islip | Fri, Apr 4 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
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Frequently Asked Questions
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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 $460. -
What is the transportation method from the main airport to downtown in Islip?
- The distance from Long Island Macarthur Airport to downtown is about 11 km. It takes about 30 minutes by taxi.
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.
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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.
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Ontario to Islip Flight Information
Off-season for travel | November |
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Peak season for travel | November |
Flight distance | 8,593.89 km |
Popular airline | Frontier Airlines |
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