To save up to 91% on this flight, we recommend booking at least 53 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 $655 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.
When flying from Islip, New York to Portland, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
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