To save on the cost of your flight from Islip to Sydney, book at least 61 days before your planned departure. Booking around this time can save you about 14% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $1,179 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,248.
July can be a great time to fly to Sydney from Islip with a flight ticket averaging about $1,017. Cheapflights users have found deals in the month of July for as cheap as $635. The most expensive prices can be found in the month of December.