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 76%. The average delay is 77 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.ISP → PBI
ISP (Islip) to PBI (West Palm Beach)
ISP → PBI on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. 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 JetBlue Airways on this route — 76% vs 71% on time.
Airline Comparison
Southwest Airlines leads at 76% on time; JetBlue Airways trails at 71%.
Accurate?
Good to know
Departing from ISP
77% on timeTSA is currently ~18 min. Best time: 4 AM (about 5 min).
Arriving at PBI
75% on timeWhen flights into PBI are late, the average delay is 76 minutes. Build buffer if you have ground plans.
If connecting at PBI: TSA is ~6 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 August 2026. Source: Bureau of Transportation Statistics.