72% of flights from West Palm Beach to Islip arrived on time over the past 12 months. That is worse than the typical U.S. route. The 10 a.m. departures ran on time 85% of the time; the 1 p.m. ones 68%. Most reliable airline: JetBlue (75%). 10% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for PBI → ISP: when a flight was late, it was under 45 minutes late 55% of the time. About 1 in 12 flights landed an hour or more late, and 1 in 103 three hours or more; 1.8% were cancelled outright.
- On time or early72%
- 15–30 min late8.7%
- 30–60 min late8.4%
- 1–2 hours late5.1%
- 2–3 hours late2.4%
- 3+ hours late1.0%
- Diverted0.3%
- Cancelled1.8%
Share of all 1,134 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| JetBlue | 542 | 75% | 1.8% | −7 min | 9.0% | +65 min | JetBlue |
| Southwest Airlines | 523 | 73% | 1.1% | 0 min | 6.7% | +53 min | Southwest Airlines |
| Frontier Airlines | 69 | — | — | — | — | — | Frontier Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at PBI). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Southwest Airlines |
|---|---|
| noon | 81% |
Last flight of the day
On PBI → ISP, each airline's last flight of the day was cancelled 2.3% of the time, against 1.8% for its earlier flights (1.3× as often). It arrived 3+ hours late 1.8% of the time (earlier flights: 0.5%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| JetBlue | 1:00 p.m. | 2.9% | 1.5% | 1.9% | first flight 10:59 a.m. |
| Southwest Airlines | 1:55 p.m. | 1.7% | 2.2% | 1.6% | first flight 1:55 p.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in ISP tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: October (88%). Worst: July (68%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 163 | 66% | 4.3% |
| Tuesday | 161 | 76% | 0.0% |
| Wednesday | 159 | 82% | 0.0% |
| Thursday | 164 | 71% | 0.0% |
| Friday | 163 | 71% | 1.2% |
| Saturday | 155 | 75% | 0.7% |
| Sunday | 169 | 65% | 5.9% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 14 · airline 5 · air traffic/airport 1
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| B6 544 | 10:09 a.m. | 334 | 79% | 0.9% | −8 min | JetBlue |
| B6 444 | 10:12 a.m. | 141 | 65% | 1.4% | +1 min | JetBlue |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Feb 22, 2026 | 5 | 0% | 3 |
| Dec 28, 2025 | 5 | 0% | 0 |
| Apr 2, 2026 | 4 | 0% | 0 |
| Jan 25, 2026 | 4 | 0% | 4 |
| Apr 7, 2026 | 4 | 0% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of West Palm Beach or Islip. None has been clearly more reliable than PBI → ISP.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| PBI → ISP (this route) | 1,134 | 72% | 1.8% |
| PBI → EWR President Donald J. Trump to Newark | 3,394 | 73% | 3.1% |
| FLL → HPN Fort Lauderdale to Westchester | 880 | 71% | 2.2% |
| PBI → JFK President Donald J. Trump to New York JFK | 2,051 | 71% | 4.3% |
| PBI → HPN President Donald J. Trump to Westchester | 1,574 | 69% | 3.4% |
| FLL → EWR Fort Lauderdale to Newark | 4,666 | 68% | 3.7% |
| FLL → JFK Fort Lauderdale to New York JFK | 3,896 | 66% | 4.8% |
Questions
How often are flights from PBI to ISP on time?
72% of 1,134 scheduled flights from West Palm Beach/Palm Beach, FL to Islip, NY arrived within 15 minutes of schedule between September 2025 and August 2026. 1.8% were cancelled.
What is the best time of day to fly PBI to ISP?
Flights scheduled to leave at 10 a.m. were the most reliable (85% on time). The 1 p.m. departures were the least (68%).
Which airline is most on time from PBI to ISP?
JetBlue: 75% of its 542 flights on the route arrived on time. Southwest Airlines: 73%.
What month has the most delays from PBI to ISP?
July (68% on time). The best month is October (88%), over 2023–2026.
Is the last flight of the day from PBI to ISP more likely to be cancelled?
Yes. Each airline's last PBI–ISP flight of the day was cancelled 2.3% of the time over the past year, against 1.8% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- ISP → PBI (return)
- President Donald J. Trump (PBI) delays by hour
- Flights into Long Island MacArthur (ISP)
- JetBlue on-time record
- Southwest Airlines on-time record
- Frontier Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.