Carrier route record
B6PBI→ISP
JetBlue Airways · West Palm Beach to Islip
- Flights
- 542
- Period
- September 2025 to August 2026
- Share of route
- 48%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on PBI to ISP lands a B, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 542 flights, with a median arrival 7 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate JetBlue on PBI to ISP from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.8%
Arrivals under 15 minutes late, of 530 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.85%
National rate is 1.89%
Whole route
73.9%
Every carrier on PBI to ISP, 1,134 flights
These figures cover 542 flights between September 2025 and August 2026. Beyond the headline rate, 9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
JetBlue against every carrier on PBI to ISP
JetBlue flew 542 of the 1,134 flights on PBI to ISP, about 48% of it. Its 76.8% on time is 3 points better than the route as a whole, which runs 73.9%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from JetBlue at 76.8% to Frontier at 50.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways (this page) | 542 | 76.8% | 65 min | 1.85% | B |
| Southwest Airlines | 523 | 73.9% | 53 min | 1.15% | C |
| Frontier Airlinesthin sample | 69 | 50.0% | 67 min | 5.80% | F− |
Flight by flight
JetBlue flight numbers on PBI to ISP
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 28 points, against half a point between the best and worst carrier.
- 5am–8am76 flights94.6%
- 8am–11am145 flights85.4%
- 11am–2pm208 flights71.6%
- 2pm–5pm2 flights—
- 5pm–8pm19 flights—
- 8pm–5am92 flights67.0%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 94.6% of the time, against 67.0% for the overnight window. That is 28 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 208 flights scheduled in it.
Across the year
JetBlue on PBI to ISP through the year
February is the weak month at 64.2% on time, against 93.3% in September. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. January was the busiest month here, with 62 flights.
Across the week, Wednesday is the strongest day at 85.7% on time and Monday the weakest at 64.5%, a spread of 21 points.
Arrival by arrival
How late JetBlue on PBI to ISP runs when it is late
JetBlue on PBI to ISP often beats the schedule: 167 of 530 completed flights, 32%, arrived 15 minutes or more early. The 123 late arrivals split 42 under half an hour, 32 between 30 and 60 minutes, and 49 an hour or more.
- 15+ min early167 flights31.5%
- Within 15 min240 flights45.3%
- 15–29 min late42 flights7.9%
- 30–59 min late32 flights6.0%
- 1–2 hours late28 flights5.3%
- 2+ hours late21 flights4.0%
Scale runs 0% to 100%.
Share of 530 completed flights by arrival against schedule.
20 of 126 late departures made up the time and arrived on time, 16% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for JetBlue on PBI to ISP
The latest arrival of the period was on 15 December 2025, 4 hours 42 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 December 2025 | 4 hours 42 minutes | Late-arriving aircraft |
| 19 July 2026 | 4 hours 38 minutes | Late-arriving aircraft |
| 21 February 2026 | 3 hours 44 minutes | Late-arriving aircraft |
| 6 March 2026 | 3 hours 34 minutes | Carrier |
| 16 March 2026 | 3 hours 31 minutes | National Airspace System |
Delay causes
Why JetBlue runs late on this route
Late-arriving aircraft accounts for 67% of the 8,014 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Late-arriving aircraft
- 21%Carrier
- 11%National Airspace System
- 1%Security
- 0%Extreme weather
67% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,014 reported delay minutes here, that single category outweighs weather by 67 to one. The split is drawn from 8,014 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 94.6% on time here.
Cancellations sit at 1.85% against a national 1.89%, which is ordinary. Diversions add another 0.37%.
Connections and stage length
What a delay here costs
9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,052 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 73.7% on time across 540 flights, 3 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 3 points of difference.
One caution: this is a thin sample. 542 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking JetBlue on PBI to ISP
Put together: treat all of this as provisional. 542 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 76.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 530 completed flights over 12 months sit behind that.
Related
Where to go next
- PBI to ISP, every carrier
- JetBlue on ISP to PBI, the return leg
- Southwest Airlines on PBI to ISP73.9%
- JetBlue Airways network-wide record
- Palm Beach International (PBI) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.