Cheap Flights from Islip (ISP) to Lisbon (LIS)

Frequently Asked Questions

• What are the cheapest flights from Islip to Lisbon (ISP-LIS)?

  Based on Trip.com data, Cape Air offers one-way fares as low as €798 on Cheapest nonstop routes (e.g. ISP to LIS on Fri, Dec 12), while Cape Air offers Cheapest nonstop round-trips from €2,807 departing on Sat, Dec 27 and returning on Sat, Jan 3.

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

  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 Lisbon 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 Lisbon?

  To find best deals on flights from Islip to Lisbon, 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 Fri, Dec 12, with one-way flights priced at just €798.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Cape Air.
  · 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 Lisbon travel is around November.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Islip (ISP) to Lisbon (LIS) the cheapest?

  The cheapest months to fly from Islip to Lisbon is October, when demand for travel is lower.

• Which upcoming date is cheapest to fly from Islip to Lisbon on?

  After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Islip to Lisbon on December 27, 2025 with Cape Air, with prices starting at €2,806.

• Is there any time difference between Islip and Lisbon?

  The time difference between Lisbon and Islip is 5h.

• How do I change or cancel my ticket from Islip to Lisbon?

  Tickets can only be changed or canceled 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.