$77 Cheap Frontier Airlines flights Islip (ISP) to Atlanta (ATL)

Scoring cheap one-way Frontier Airlines flights from ISP to ATL from $77 on Expedia is a cinch — just filter by "Price (lowest to highest)." Or check out our affordable return fares from $154 for your next exciting getaway.**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 affordable Frontier Airlines flights from MacArthur Airport (ISP) to Hartsfield-Jackson Atlanta Intl. Airport (ATL) one to three months prior to your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the best day of the week to book a domestic flight is usually Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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.

Find Frontier Airlines's earliest flights from ISP to ATL by selecting the "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.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to travel from ISP to ATL with Frontier Airlines. Plus, by joining Expedia's free One Key™ program, you can earn OneKeyCash™* alongside Frontier Airlines's loyalty program earnings. It's yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.