Cheap Frontier Airlines flights Fort Myers (RSW) to Islip (ISP)

Set the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from RSW to ISP. Affordable one-way tickets are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the cheapest months to fly to Islip with Frontier Airlines. You could also find fantastic deals on one-way and return tickets in February.

Begin your search one to three months before your departure to get cheaper fares on Frontier Airlines flights from Southwest Florida Intl. Airport (RSW) to MacArthur Airport (ISP). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Simply enter your dates, hit search and check “Nonstop” on Expedia to find any direct flights from RSW to ISP with Frontier Airlines or other carriers.

Browse Frontier Airlines’s earliest flights from RSW to ISP by using our “Early Morning” and “Morning” filters. Not only will you get to your destination sooner, early departures are also 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

MacArthur Airport (ISP) is the primary Islip hub for Frontier Airlines flights from Southwest Florida Intl. Airport (RSW).

Travel from RSW to ISP with Frontier Airlines and enjoy a range of benefits starting with a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you may also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

It’s usually possible to reschedule or cancel your flight, although additional fees may apply if you made your booking more than 24 hours ago. Prefer to keep your options open? Use our “No cancel fee” or “Changes included” filter to find flights that won’t penalize you if you need to revise your plans. To make changes, go to “Trips,” select your flight and click on “Manage Booking” for more information.