West Palm Beach/Palm Beach (PBI) to Islip (ISP): On-Time Performance
Data through July 2026
The calendar drives reliability on PBI–ISP. November 2024 flights landed on schedule 93% of the time, but February 2026 dropped to 61% — a gap of 32 points. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (84% vs 61%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 3.3
- last 12 months
- Duration
- 2h 43m
- scheduled
- Distance
- 1,052 mi
Best airline from PBI to ISP
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 77% | 15 min | 1.2% | 806 |
| Southwest Airlines | 76% | 17 min | 0.7% | 1,343 |
| Frontier Airlines | 58% | 35 min | 3.0% | 263 |
Monthly on-time trend
Best time to fly from PBI to ISP
Aim for departures around 7 a.m. (94% on-time); avoid 7 p.m. departures (52%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 24 min |
| Tuesday | 79% | 15 min |
| Wednesdaybest | 79% | 12 min |
| Thursday | 71% | 21 min |
| Friday | 72% | 17 min |
| Saturday | 78% | 16 min |
| Sunday | 69% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft64%
- Airline operations24%
- National airspace system10%
- Weather1%
Frequently asked questions
- How often are flights from PBI to ISP delayed?
- 26% of PBI–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 18 minutes.
- Which airline is most reliable from PBI to ISP?
- JetBlue Airways has the best on-time record on this route at 77%, based on 806 flights. 3 airlines flew PBI–ISP frequently enough to compare in this period.
- What is the best time of day to fly from PBI to ISP?
- Departures around 7 a.m. have the best record (94% on-time), while departures around 7 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 PBI to ISP?
- The scheduled PBI–ISP flight time averages 2h 43m over 1,052 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are PBI to ISP flights cancelled?
- 1.2% 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 PBI to ISP?
- February 2026 was the roughest month in this dataset, with only 61% of arrivals on time. The best was November 2024 at 93%. If your dates are flexible, that 32-point gap is worth planning around.
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Based on 2,412 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.