FlightRecord

Baltimore (BWI) to Islip (ISP): On-Time Performance

Data through May 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 (87% vs 64%), which matters most in the rough months.

On-time
76%
arrived <15 min late
Avg delay
14 min
completed flights
Cancelled
1.4%
Flights/day
3.3
last 12 months
Duration
1h 10m
scheduled
Distance
220 mi

Monthly on-time trend

Monthly on-time percentage for BWI to ISP flights50%75%100%June 2024: 69% on-time (121 flights)69Jun 2024July 2024: 60% on-time (127 flights)60August 2024: 65% on-time (100 flights)65September 2024: 86% on-time (94 flights)86Sep 2024October 2024: 82% on-time (93 flights)82November 2024: 88% on-time (89 flights)88December 2024: 73% on-time (94 flights)73Dec 2024January 2025: 83% on-time (90 flights)83February 2025: 90% on-time (82 flights)90March 2025: 76% on-time (89 flights)76Mar 2025April 2025: 79% on-time (106 flights)79May 2025: 68% on-time (114 flights)68June 2025: 63% on-time (123 flights)63Jun 2025July 2025: 63% on-time (128 flights)63August 2025: 73% on-time (97 flights)73September 2025: 83% on-time (90 flights)83Sep 2025October 2025: 85% on-time (93 flights)85November 2025: 80% on-time (91 flights)80December 2025: 71% on-time (93 flights)71Dec 2025January 2026: 89% on-time (93 flights)89February 2026: 86% on-time (85 flights)86March 2026: 71% on-time (89 flights)71Mar 2026April 2026: 82% on-time (107 flights)82May 2026: 71% on-time (114 flights)71

Best time to fly from BWI to ISP

Aim for departures around 8 a.m. (94% on-time); avoid 10 p.m. departures (53%).

On-time percentage by scheduled departure hour, BWI to ISP8 a.m.: 94% on-time (70 flights)89 a.m.: 89% on-time (100 flights)910 a.m.: 86% on-time (439 flights)1011 a.m.: 89% on-time (150 flights)1112 p.m.: 84% on-time (69 flights)121 p.m.: 75% on-time (69 flights)132 p.m.: 84% on-time (174 flights)143 p.m.: 82% on-time (191 flights)154 p.m.: 69% on-time (180 flights)165 p.m.: 68% on-time (79 flights)177 p.m.: 63% on-time (116 flights)198 p.m.: 76% on-time (168 flights)209 p.m.: 72% on-time (264 flights)2110 p.m.: 53% on-time (319 flights)22scheduled departure hour

By day of week

DayOn-timeAvg delay
Monday73%18 min
Tuesdaybest82%11 min
Wednesday81%12 min
Thursday76%13 min
Friday73%17 min
Saturday78%12 min
Sunday67%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 operations40%
  • National airspace system9%
  • 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 2024-06 and 2026-05. 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 (94% on-time), while departures around 10 p.m. have the worst (53%). 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?
1.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, 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.

Explore related pages

More routes from BWI

Based on 2,402 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.