Long Island MacArthur Airport (ISP) delays & on-time performance
Islip, New York · 8 nonstop destinations · 3 airlines · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ISP right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
On-time arrivals
76%
arrived < 15 min late
Cancelled
2.1%
104 flights
Avg arrival delay
18 min
71 min when late
Departed on time
75%
avg taxi-out 13 min
Figures cover 4,966 departures from ISP; on-time is measured at arrival. Arrivals into ISP were on time 75% of the time.
Key facts
- Flights departing Long Island MacArthur Airport (ISP) arrived on time 76% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.1% were cancelled, and 8% arrived an hour or more late.
- Southwest Airlines was the most punctual airline here (78% on time); JetBlue was the least (72%).
- Departures scheduled around 5am did best (91% on time); around 6pm did worst (59%).
- The largest source of delay minutes was late-arriving aircraft (43%).
Most delayed routes from ISP
Lowest on-time arrival rates among regularly flown routes.
- FLL · Fort Lauderdale69%405 flts
- PBI · West Palm Beach/Palm Beach72%1,221 flts
- TPA · Tampa72%445 flts
- MCO · Orlando73%1,424 flts
- BWI · Baltimore85%1,235 flts
Most reliable routes from ISP
Highest on-time arrival rates among regularly flown routes.
- BWI · Baltimore85%1,235 flts
- MCO · Orlando73%1,424 flts
- TPA · Tampa72%445 flts
- PBI · West Palm Beach/Palm Beach72%1,221 flts
- FLL · Fort Lauderdale69%405 flts
Best airline at ISP
Departures from this airport, ranked by on-time arrival.
| Airline | On time | Cancelled | Avg delay | Routes | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 78% | 1.6% | 14 min | 6 | 2,589 |
| Frontier Airlines | 74% | 3.4% | 22 min | 6 | 845 |
| JetBlue | 72% | 2.2% | 24 min | 5 | 1,532 |
Best time to fly out of ISP
On-time arrival rate by scheduled departure hour (local time).
- 5am91%268 flts
- 6am89%661 flts
- 7am79%203 flts
- 8am81%132 flts
- 9am88%200 flts
- 10am80%270 flts
- 11am82%417 flts
- 12pm79%516 flts
- 1pm68%315 flts
- 2pm60%277 flts
- 3pm66%483 flts
- 4pm71%422 flts
- 5pm65%389 flts
- 6pm59%168 flts
- 7pm59%88 flts
- 8pm63%96 flts
- 9pm80%61 flts
Monthly trend
Why departures were late
- Late-arriving aircraft43%
- Airline (crew, maintenance, cleaning, fueling)27%
- Air traffic control & airport congestion23%
- Extreme weather6%
- Security0%
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.