ISP (Islip) to PBI (West Palm Beach) flights arrive on time 75% of the time. The most reliable airline on this route is Southwest Airlines at 77%. The average delay is 78 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.ISP → PBI
ISP (Islip) to PBI (West Palm Beach)
ISP → PBI on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is on time most of the time. About 75% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Southwest Airlines edges out Frontier Airlines on this route — 77% vs 71% on time.
Airline Comparison
Southwest Airlines leads at 77% on time; Frontier Airlines trails at 71%.
Accurate?
Good to know
Departing from ISP
77% on timeTSA is currently ~20 min. Best time: 4 AM (about 5 min).
Arriving at PBI
75% on timeWhen flights into PBI are late, the average delay is 77 minutes. Build buffer if you have ground plans.
If connecting at PBI: TSA is ~26 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Southwest Airlines 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.