Due to multiple factors, expect to potentially pay more when booking in November. For low rates, February can be a great choice for travel to Islip, New York. Flights to Islip, New York from Kansas City in February are about $268 on average during February, but can be found for as low as $99.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kansas City to Islip, New York as you normally would.