Cheap Frontier Airlines flights Miami (MIA) to Islip (ISP)

You’ll find cheap return Frontier Airlines flights from MIA to ISP by filtering your results from “Price (lowest to highest)” on Expedia. Or search for deals for a one-way trip.**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.

Search for one-way or round-trip flights to Islip in January or February. You could find a cheap fare with Frontier Airlines during these off-peak times.

Begin your search one to three months ahead of your travel date to score cheaper fares on Frontier Airlines flights from Miami Intl. Airport (MIA) to MacArthur Airport (ISP). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut 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 flights.*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.

Click on the “Nonstop” filter when looking for direct Frontier Airlines flights from MIA to ISP. It’s also a good way to compare other carriers offering the same direct trip.

Filter your results by “Morning” and “Early Morning” to browse the earliest departures from MIA to ISP. Heading off early means flight cancellations are less likely.**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.

Frontier Airlines flights from Miami Intl. Airport (MIA) to Islip come in to MacArthur Airport (ISP). This is the main entry point to this destination.

Depart from MIA to ISP with Frontier Airlines and you’ll enjoy a range of perks including a rewarding loyalty program. When you book 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.

Typically, you can cancel or change your flight, although there may be additional fees if you booked over 24 hours ago. Need flexible options? Make use of Expedia’s “No cancel fee” or “Changes included” filter to find flights that won’t charge you extra if you need to adjust your plans. To make changes, go to “Trips,” select your flight and click on “Manage Booking” for further information.