It’s generally more expensive to depart on a Friday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.
Travelers have found it’s best to book a flight 19 days in advance to save up to 23% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 19 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Islip to Knoxville 1-2 weeks in advance for as low as $297, or $376 for flights within the next 24 hours.
Flights from Islip to Knoxville lean towards being more expensive in January. Prices are generally better when you fly from Islip to Knoxville in July, with the cheapest ticket starting at $188.
One of the essential ways to save on airfare from Islip to Knoxville is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. If a flight is in the noon is possible it can save you up to 15% on airfare.