To save up to 39% on this flight, we recommend booking at least 61 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 to Seoul from $1,193 1-2 weeks out and tickets from $1,211 for flights departing within the next 72 hours.
Flights from Islip to Seoul lean towards being more expensive in June. Prices are generally better when you fly from Islip to Seoul in April, with the cheapest ticket starting at $549.