ISP (Islip) to FLL (Fort Lauderdale) flights arrive on time 77% 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 air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated May 2026.ISP → FLL
ISP (Islip) to FLL (Fort Lauderdale)
ISP → FLL on-time performance by month
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25
JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 77% of flights arrive on schedule.
Delays on this route are most often caused by air traffic and busy airspace.
Accurate?
Airlines are roughly equal on this route — Frontier Airlines leads slightly at 77% vs JetBlue Airways at 77%.
Airline Comparison
Frontier Airlines leads at 77% on time; JetBlue Airways trails at 77%.
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 FLL
75% on timeWhen flights into FLL are late, the average delay is 71 minutes. Build buffer if you have ground plans.
If connecting at FLL: TSA is ~16 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.
Let us watch your flight
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Data last updated May 2026. Source: Bureau of Transportation Statistics.