Cheap flights from Islip to Ontario (ISP - ONT) from $293

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 55 days in advance, which can save you up to 41% on flights from Islip to Ontario compared to booking the week you need them. Waiting 55 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $445. For sooner than that we have options available in the next 3 days from $583.

January is one of the best times of the year to fly to Ontario from Islip. Prices for January average $408 per person but you can even find prices for as low as $185. The most expensive prices can be found in the month of June. Opting for a January flight can save you 38% on your journey compared to booking in June

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

Yes, there are multiple flights from Islip to Ontario for under $300. The cheapest flight booked recently is on Frontier for just $293, but on average you can expect to pay $293.

While on average a flight from Islip to Ontario is generally $180, our data shows the cheapest flight currently is $158. When looking at the most popular route, (Islip Long Island - Ontario), you can expect to pay $293 for that flight.

This is defined as Islip Long Island Airport (ISP) and Ontario Airport (ONT). Codes like Ontario Airport are often used to just call airports uniquely.