Baltimore (BWI) to Islip (ISP): On-Time Performance
Data through July 2026
When you fly BWI to ISP matters as much as anything else about the booking: the route swung from 90% on-time in February 2025 to just 60% in July 2024. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 65%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 3.4
- last 12 months
- Duration
- 1h 10m
- scheduled
- Distance
- 220 mi
Monthly on-time trend
Best time to fly from BWI to ISP
Aim for departures around 8 a.m. (95% on-time); avoid 10 p.m. departures (54%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 18 min |
| Tuesday | 82% | 10 min |
| Wednesdaybest | 82% | 11 min |
| Thursday | 75% | 14 min |
| Friday | 75% | 17 min |
| Saturday | 78% | 12 min |
| Sunday | 67% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft47%
- Airline operations39%
- National airspace system10%
- Weather4%
Frequently asked questions
- How often are flights from BWI to ISP delayed?
- 24% of BWI–ISP flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- What is the best time of day to fly from BWI to ISP?
- Departures around 8 a.m. have the best record (95% on-time), while departures around 10 p.m. have the worst (54%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BWI to ISP?
- The scheduled BWI–ISP flight time averages 1h 10m over 220 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are BWI to ISP flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BWI to ISP?
- July 2024 was the roughest month in this dataset, with only 60% of arrivals on time. The best was February 2025 at 90%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 2,565 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.