ATL (Atlanta) to ISP (Islip) flights arrive on time 76% of the time. The most reliable airline on this route is Frontier Airlines at 75%. The average delay is 67 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated March 2026.ATL → ISP
ATL (Atlanta) to ISP (Islip)
ATL → ISP on-time performance by month
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This route is on time most of the time. About 76% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Accurate?
Good to know
Departing from ATL
83% on timeExpect ~16 min sitting on the taxiway after your gate pushes back. ATL has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at ISP
77% on timeWhen flights into ISP are late, the average delay is 68 minutes. Build buffer if you have ground plans.
If connecting at ISP: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
ISP has a 2.1% cancellation rate — keep the airline app handy for rebooking.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.