$91 Cheap Frontier Airlines flights Islip (ISP) to Raleigh (RDU)

Make use of the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from $170 from ISP to RDU. Affordable one-way fares from $91 are also on offer.**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.

Frontier Airlines flights to Raleigh are usually cheaper in the off-peak months of January and December. Whether you’re after a round-trip or one-way ticket, you could land a better deal then.

Begin your search one to three months ahead of your travel date to find cheaper fares on Frontier Airlines flights from MacArthur Airport (ISP) to Raleigh - Durham Intl. Airport (RDU). 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 the timing right, 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.

Fill in your dates, hit search and select the “Nonstop” filter on Expedia to browse any direct flights from ISP to RDU with Frontier Airlines or another airline.

Sort your results by “Early Morning” and “Morning” to find the earliest departures from ISP to RDU. Taking off early means you’re less likely to experience 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.

Raleigh - Durham Intl. Airport (RDU) is the primary Raleigh gateway for Frontier Airlines flights from MacArthur Airport (ISP).

Depart from ISP to RDU with Frontier Airlines and enjoy a range of benefits including a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you may 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.

Changes are often free within 24 hours of making your booking, but your airline may charge a fee after that time. For more information about modifying your flights, check out your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your plans without additional costs, tick the “Changes included” or “No cancel fee” filter when planning your next trip.