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 Lisbon as you normally would.
To save on the cost of your flight from Islip, New York to Lisbon, book at least 61 days before your planned departure. Booking around this time can save you about 30% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $798 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $941.