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 August 2026.ATL → ISP
ATL (Atlanta) to ISP (Islip)
ATL → ISP on-time performance by month
24
JanFebMarAprMayJunJulAugSepOctNovDec
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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
80% on timeExpect ~17 min sitting on the taxiway after your gate pushes back. ATL has long runway queues.
TSA is currently ~12 min. Best time: 4 AM (about 5 min).
Arriving at ISP
77% on timeWhen flights into ISP are late, the average delay is 69 minutes. Build buffer if you have ground plans.
If connecting at ISP: TSA is ~20 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Frontier Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of ATL? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated August 2026. Source: Bureau of Transportation Statistics.