Islip (ISP) to Orlando (MCO): On-Time Performance
Data through July 2026
Islip (ISP) to Orlando (MCO) effectively runs on two schedules. In October 2024, 94% of arrivals were on time; in August 2025 that fell to 60% — a 35-point seasonal swing. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 59%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 3.9
- last 12 months
- Duration
- 2h 54m
- scheduled
- Distance
- 971 mi
Best airline from ISP to MCO
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 76% | 17 min | 1.3% | 1,395 |
| JetBlue Airways | 74% | 20 min | 1.0% | 673 |
| Frontier Airlines | 73% | 27 min | 2.4% | 884 |
Monthly on-time trend
Best time to fly from ISP to MCO
Aim for departures around 5 a.m. (94% on-time); avoid 6 p.m. departures (52%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 22 min |
| Tuesdaybest | 79% | 22 min |
| Wednesday | 73% | 16 min |
| Thursday | 76% | 20 min |
| Friday | 73% | 27 min |
| Saturday | 78% | 17 min |
| Sunday | 69% | 20 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 operations25%
- National airspace system24%
- Weather5%
Frequently asked questions
- How often are flights from ISP to MCO delayed?
- 26% of ISP–MCO 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 21 minutes.
- Which airline is most reliable from ISP to MCO?
- Southwest Airlines has the best on-time record on this route at 76%, based on 1,395 flights. 3 airlines flew ISP–MCO frequently enough to compare in this period.
- What is the best time of day to fly from ISP to MCO?
- Departures around 5 a.m. have the best record (94% on-time), while departures around 6 p.m. have the worst (52%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ISP to MCO?
- The scheduled ISP–MCO flight time averages 2h 54m over 971 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are ISP to MCO 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 ISP to MCO?
- August 2025 was the roughest month in this dataset, with only 60% of arrivals on time. The best was October 2024 at 94%. If your dates are flexible, that 35-point gap is worth planning around.
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Based on 2,952 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.