BWI (Baltimore) to ISP (Islip) flights arrive on time 75% of the time. The most reliable airline on this route is Southwest Airlines at 76%. 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 March 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 75% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
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Good to know
Departing from BWI
78% on timeTSA is currently ~7 min. Best time: 4 AM (about 5 min).
Arriving at ISP
77% on timeWhen flights into ISP are late, the average delay is 68 minutes. Build buffer if you have ground plans.
If connecting at ISP: TSA is ~14 min right now. Allow at least 60 minutes for a domestic connection.
ISP has a 2.1% cancellation rate — keep the airline app handy for rebooking.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.