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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 14:0616h 54m2 stopsISP 10:00Ontario - Islip | Mon, Apr 28 | Frontier AirlinesISP 18:5119h 35m2 stopsSIN 11:26Islip - Ontario | Tue, May 6 | Frontier AirlinesUS$250 US$1,37482% OFF82% OFFUS$1,374 US$250
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ONT 06:0034h 41m2 stopsISP 19:41Ontario - Islip | Thu, Jun 5 | Frontier AirlinesISP 20:2630h 13m2 stopsSIN 23:39Islip - Ontario | Sun, Jun 8 | Frontier AirlinesUS$317 US$1,37477% OFF77% OFFUS$1,374 US$317
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ONT 12:1619h 25m2 stopsISP 10:41Ontario - Islip | Fri, May 16 | Frontier AirlinesISP 18:4844h 20m2 stopsSIN 12:08Islip - Ontario | Mon, May 19 | Frontier AirlinesUS$319 US$1,37477% OFF77% OFFUS$1,374 US$319
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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$39871% OFFUS$1,374 US$398
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ONT 14:0617h 35m2 stopsISP 10:41Ontario - Islip | Fri, May 2 | Frontier AirlinesISP 18:4844h 20m2 stopsSIN 12:08Islip - Ontario | Sun, May 4 | Frontier AirlinesUS$43968% OFFUS$1,374 US$439
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ONT 00:5930h 13m2 stopsISP 10:12Ontario - Islip | Wed, Apr 30 | Frontier AirlinesISP 18:4821h 50m2 stopsSIN 13:38Islip - Ontario | Sun, May 4 | Frontier AirlinesUS$45767% OFFUS$1,374 US$457
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ONT 06:0815h 42m2 stopsISP 00:50Ontario - Islip | Sat, May 17 | United AirlinesISP 06:0012h 10m1 stopsSIN 15:10Islip - Ontario | Fri, May 23 | Jetblue AirwaysUS$60756% OFFUS$1,374 US$607
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ONT 11:5119h 50m2 stopsISP 10:41Ontario - Islip | Fri, May 16 | Alaska AirlinesISP 18:4822h 25m2 stopsSIN 14:13Islip - Ontario | Mon, May 19 | Frontier AirlinesUS$79742% OFFUS$1,374 US$797
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ONT 06:0031h 36m2 stopsISP 16:36Ontario - Islip | Thu, May 22 | United AirlinesISP 06:0012h 15m1 stopsSIN 15:15Islip - Ontario | Mon, May 26 | Jetblue AirwaysUS$1,10220% OFFUS$1,374 US$1,102
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ONT 16:2916h 33m2 stopsISP 12:02Ontario - Islip | Wed, Apr 30 | Alaska AirlinesISP 13:0025h 20m1 stopsSIN 11:20Islip - Ontario | Sun, May 4 | Jetblue AirwaysUS$1,20912% OFFUS$1,374 US$1,209
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ONT 13:0017h 25m1 stopsISP Invalid DateOntario - Islip | Tue, Apr 29 | Normal AirlineISP 15:006hNonstopONT 16:00Islip - Ontario | Thu, May 1 | Normal AirlineFind More FlightsFind More Flights
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ONT 12:1024h 13m2 stopsISP 15:23Ontario - Islip | Tue, Apr 29 | Frontier AirlinesUS$133 US$30856% OFF56% OFFUS$308 US$133
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ONT 14:0617h 35m2 stopsISP 10:41Ontario - Islip | Fri, May 16 | Frontier AirlinesUS$151 US$30851% OFF51% OFFUS$308 US$151
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ONT 14:0616h 54m2 stopsISP 10:00Ontario - Islip | Mon, Apr 28 | Frontier AirlinesUS$170 US$30845% OFF45% OFFUS$308 US$170
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ONT 12:2621h 2m2 stopsISP 12:28Ontario - Islip | Fri, May 2 | Frontier AirlinesUS$18440% OFFUS$308 US$184
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ONT 12:1625h 17m2 stopsISP 16:33Ontario - Islip | Thu, May 1 | Frontier AirlinesUS$18939% OFFUS$308 US$189
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ONT 19:3035h 30m2 stopsISP 10:00Ontario - Islip | Sun, Apr 27 | Frontier AirlinesUS$19936% OFFUS$308 US$199
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ONT 00:5915h 42m2 stopsISP 19:41Ontario - Islip | Wed, Jun 11 | Frontier AirlinesUS$20932% OFFUS$308 US$209
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ONT 14:0617h 6m2 stopsISP 10:12Ontario - Islip | Sun, May 4 | Frontier AirlinesUS$23922% OFFUS$308 US$239
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ONT 17:1323h 23m2 stopsISP 19:36Ontario - Islip | Thu, Jun 12 | Frontier AirlinesUS$26813% OFFUS$308 US$268
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ONT 06:1030h 13m2 stopsISP 15:23Ontario - Islip | Mon, Apr 28 | United AirlinesUS$27112% OFFUS$308 US$271
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ONT 13:0017h 25m1 stopsISP Invalid DateOntario - Islip | Tue, Apr 29 | 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 $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.
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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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