BWI (Baltimore) to ISP (Islip) flights arrive on time 77% of the time. The most reliable airline on this route is Southwest Airlines at 78%. The average delay is 53 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.BWI → ISP
BWI (Baltimore) to ISP (Islip)
BWI → ISP on-time performance by month
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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 the incoming plane arriving late.
Accurate?
Accurate?
Good to know
Departing from BWI
80% on timeTSA is currently ~21 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 ~12 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 BWI? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
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Data last updated August 2026. Source: Bureau of Transportation Statistics.