$93 Cheap Frontier Airlines flights Raleigh (RDU) to Islip (ISP)

Use the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from $177 from RDU to ISP. Affordable one-way fares from $93 are available too.**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 least expensive months to jet away to Islip with Frontier Airlines. You could also find great deals on one-way and round-trip tickets in February.

Start searching one to three months ahead of your departure date to get cheap fares on Frontier Airlines flights from Raleigh - Durham Intl. Airport (RDU) 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 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 select “Nonstop” on Expedia to browse any direct flights from RDU to ISP with Frontier Airlines or other carriers.

Browse Frontier Airlines’s earliest flights from RDU to ISP by checking our “Early Morning” and “Morning” filters. Not only will you arrive at your destination sooner, early departures also experience 20% fewer cancellations.**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.

Take a Frontier Airlines flight from Raleigh - Durham Intl. Airport (RDU) to Islip, and you’ll most likely come in to MacArthur Airport (ISP). This is the airline’s main hub here.

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

Depending on your ticket type, a fee typically applies if you cancel or change your booking more than 24 hours after confirmation. To find flexible fares, select our “Changes included” and “No cancel fee” boxes when you search for flights. To learn more about modifying or canceling your reservation, head to “Trips,” select your flight and click on “Manage Booking.”