To save up to 66% on this flight, we recommend booking at least 57 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 San Francisco from $413 1-2 weeks out and tickets from $574 for flights departing within the next 72 hours.
Due to multiple factors, expect to potentially pay more when booking in December. For low rates, September can be a great choice for travel to San Francisco. Flights to San Francisco from Islip, New York in September are about $393 on average during September, but can be found for as low as $124.
When flying from Islip, New York to San Francisco, 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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