Our data shows that August tends to be the cheapest month to fly to Illinois from Islip, New York. Users have commonly found prices around $182 for the month, but tickets can be as low as $64. Due to multiple factors, prepare for potentially higher prices in December.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to Illinois as you normally would.
When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 20 days in advance, which can save you up to 48% on flights from Islip, New York to Illinois compared to booking the week you need them. Waiting 20 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 $213. For sooner than that we have options available in the next 3 days from $293.