ISP (Islip) to FLL (Fort Lauderdale) flights arrive on time 74% of the time. The most reliable airline on this route is JetBlue Airways at 75%. The average delay is 84 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated October 2026.ISP → FLL
ISP (Islip) to FLL (Fort Lauderdale)
ISP → FLL on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is delayed fairly often. About 74% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Airlines are roughly equal on this route — JetBlue Airways leads slightly at 75% vs Frontier Airlines at 75%.
Airline Comparison
JetBlue Airways leads at 75% on time; Frontier Airlines trails at 75%.
Accurate?
Good to know
Departing from ISP
77% on timeTSA is currently ~15 min. Best time: 4 AM (about 5 min).
Arriving at FLL
73% on timeWhen flights into FLL are late, the average delay is 73 minutes. Build buffer if you have ground plans.
If connecting at FLL: TSA is ~29 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what JetBlue Airways owes you — refund rights, action plan, complaint email. Free.
Flying out of ISP? 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 October 2026. Source: Bureau of Transportation Statistics.