Islip to San Juan Flight Tickets, Fares starting @CAD 124

Flight FAQs

• Which airlines offer the cheapest flights from Islip (ISP) to San Juan (SJU)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as CAD 124 on Cheapest nonstop routes (e.g. ISP to SJU on Tue, Jan 13), while Frontier Airlines offers Cheapest nonstop round-trips from CAD 380 departing on Sun, Jan 11 and returning on Wed, Jan 14.

• When is the best time to book flights from Islip to San Juan?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Islip to San Juan is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How can I find the best deals on flights from Islip to San Juan?

  To find best deals on flights from Islip to San Juan, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Jan 13, with one-way flights priced at just CAD 124.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for San Juan travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When is the best time to book a flight from Islip to San Juan to get the best price?

  The cheapest months to fly from Islip to San Juan is September, when demand for travel is lower.

• Which upcoming date is the cheapest for flights from Islip to San Juan?

  After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Islip to San Juan on December 18, 2025 with Frontier Airlines, with prices starting at CAD 387.

• What is the time difference between Islip and San Juan?

  The time difference between San Juan and Islip is 1h.

• How can I change or cancel my flight ticket from Islip to San Juan?

  Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.