FlightRecord

Long Island MacArthur Airport (ISP): Delays & On-Time Performance

Data through May 2026

Long Island MacArthur Airport (ISP) is a tale of two seasons: departures ran 87% on-time in November 2024 but sank to 64% in December 2025. Across the year it averages 76% against a national 78%, over roughly 14 departures a day to 10 destinations.

Departures on-time
76%
left <15 min late
Avg dep delay
19 min
Arrivals on-time
76%
Cancelled
1.8%
Destinations
10
nonstop
Airlines
3

Monthly on-time trend

Monthly departure on-time percentage at ISP50%75%100%June 2024: 76% on-time (397 flights)76Jun 2024July 2024: 68% on-time (407 flights)68August 2024: 69% on-time (378 flights)69September 2024: 86% on-time (292 flights)86Sep 2024October 2024: 83% on-time (269 flights)83November 2024: 87% on-time (349 flights)87December 2024: 69% on-time (432 flights)69Dec 2024January 2025: 80% on-time (411 flights)80February 2025: 80% on-time (434 flights)80March 2025: 78% on-time (482 flights)78Mar 2025April 2025: 83% on-time (536 flights)83May 2025: 76% on-time (536 flights)76June 2025: 72% on-time (449 flights)72Jun 2025July 2025: 68% on-time (463 flights)68August 2025: 72% on-time (403 flights)72September 2025: 86% on-time (351 flights)86Sep 2025October 2025: 81% on-time (365 flights)81November 2025: 81% on-time (395 flights)81December 2025: 64% on-time (458 flights)64Dec 2025January 2026: 77% on-time (435 flights)77February 2026: 72% on-time (433 flights)72March 2026: 67% on-time (413 flights)67Mar 2026April 2026: 77% on-time (462 flights)77May 2026: 84% on-time (393 flights)84

Best time of day to depart from ISP

On-time percentage by scheduled departure hour at ISP5 a.m.: 93% on-time (637 flights)56 a.m.: 93% on-time (1,236 flights)67 a.m.: 92% on-time (344 flights)78 a.m.: 84% on-time (336 flights)89 a.m.: 89% on-time (373 flights)910 a.m.: 85% on-time (612 flights)1011 a.m.: 85% on-time (822 flights)1112 p.m.: 74% on-time (945 flights)121 p.m.: 71% on-time (658 flights)132 p.m.: 62% on-time (611 flights)143 p.m.: 58% on-time (626 flights)154 p.m.: 70% on-time (902 flights)165 p.m.: 61% on-time (649 flights)176 p.m.: 61% on-time (467 flights)187 p.m.: 59% on-time (261 flights)198 p.m.: 59% on-time (273 flights)209 p.m.: 71% on-time (163 flights)21scheduled departure hour

Busiest routes from ISP

RouteFlights/12moOn-timeAvg delay
ISP → MCO1,42675%21 min
ISP → PBI1,24773%21 min
ISP → BWI1,20185%11 min
ISP → TPA47372%21 min
ISP → FLL37572%23 min
ISP → MYR12381%18 min
ISP → RSW11166%26 min

Most reliable routes

  1. ISP → BWI85%
  2. ISP → MYR81%
  3. ISP → MCO75%
  4. ISP → PBI73%
  5. ISP → TPA72%

Most delay-prone routes

  1. ISP → RSW66%
  2. ISP → FLL72%
  3. ISP → TPA72%
  4. ISP → PBI73%
  5. ISP → MCO75%

Airline performance at ISP

AirlineOn-time departuresAvg delayFlights
JetBlue Airways78%20 min1,979
Southwest Airlines77%16 min5,629
Frontier Airlines73%25 min2,335

Frequently asked questions

How often are flights delayed at ISP?
24% of departures from Long Island MacArthur Airport left 15+ minutes late between 2024-06 and 2026-05, with an average departure delay of 19 minutes. The national on-time average over the same period was 78%.
What is the best time of day to depart from ISP?
Flights scheduled around 6 a.m. depart on time 93% of the time at ISP, versus 58% around 3 p.m.. Booking before noon is the usual rule of thumb here.
What is the worst month for delays at ISP?
In this dataset, December 2025 was the weakest month at ISP, with 64% of departures on time.
How often are flights cancelled at ISP?
1.8% of scheduled departures from ISP were cancelled in this period, compared with a national rate of 1.6%.

Popular route pages from this airport

Based on 9,943 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.