Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Redmond to Islip, New York as you normally would.
To save up to 43% on this flight, we recommend booking at least 31 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Redmond to Islip, New York from $618 1-2 weeks out and tickets from $649 for flights departing within the next 72 hours.