ISP (Islip) to ATL (Atlanta) flights arrive on time 78% of the time. The most reliable airline on this route is Frontier Airlines at 77%. The average delay is 75 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.ISP → ATL
ISP (Islip) to ATL (Atlanta)
ISP → ATL on-time performance by month
24
JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 78% 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 ISP
77% on timeTSA is currently ~7 min. Best time: 4 AM (about 5 min).
ISP cancels 2.1% of flights — higher than average. Have a backup plan.
Arriving at ATL
83% on timeWhen flights into ATL are late, the average delay is 68 minutes. Build buffer if you have ground plans.
If connecting at ATL: TSA is ~24 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.