To save up to 91% on this flight, we recommend booking at least 25 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Islip, New York to Portland from $408 1-2 weeks out and tickets from $645 for flights departing within the next 72 hours.
Flights from Islip, New York to Portland lean towards being more expensive in December. Prices are generally better when you fly from Islip, New York to Portland in September, with the cheapest ticket starting at $99.
One of the essential ways to save on airfare from Islip, New York to Portland is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 33% on airfare.
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