Carrier route record
B6ISP→PBI
JetBlue Airways · Islip to West Palm Beach
- Flights
- 540
- 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 ISP to PBI sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 540 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate JetBlue on ISP to PBI from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
73.7%
Arrivals under 15 minutes late, of 521 completed flights
Avg delay
95 min
Across delayed arrivals only, not all flights
Cancelled
2.59%
National rate is 1.89%
Whole route
72.1%
Every carrier on ISP to PBI, 1,133 flights
These figures cover 540 flights between September 2025 and August 2026. Beyond the headline rate, 10.9% 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 ISP to PBI
JetBlue flew 540 of the 1,133 flights on ISP to PBI, about 48% of it. Its 73.7% on time is 2 points better than the route as a whole, which runs 72.1%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from JetBlue at 73.7% to Frontier at 69.7%. 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) | 540 | 73.7% | 95 min | 2.59% | C |
| Southwest Airlines | 524 | 70.7% | 50 min | 1.72% | C |
| Frontier Airlinesthin sample | 69 | 69.7% | 86 min | 4.35% | C− |
Flight by flight
JetBlue flight numbers on ISP to PBI
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 24 points, against half a point between the best and worst carrier.
- 5am–8am50 flights89.8%
- 8am–11am14 flights—
- 11am–2pm93 flights83.0%
- 2pm–5pm304 flights69.7%
- 5pm–8pm78 flights65.8%
- 8pm–5am1 flights—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.8% of the time, against 65.8% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 304 flights scheduled in it.
Across the year
JetBlue on ISP to PBI through the year
December is the weak month at 54.3% on time, against 89.4% in May. 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, Tuesday is the strongest day at 77.3% on time and Saturday the weakest at 65.3%, a spread of 12 points.
Arrival by arrival
How late JetBlue on ISP to PBI runs when it is late
JetBlue on ISP to PBI often beats the schedule: 164 of 521 completed flights, 31%, arrived 15 minutes or more early. The 137 late arrivals split 44 under half an hour, 36 between 30 and 60 minutes, and 57 an hour or more.
- 15+ min early164 flights31.5%
- Within 15 min220 flights42.2%
- 15–29 min late44 flights8.4%
- 30–59 min late36 flights6.9%
- 1–2 hours late26 flights5.0%
- 2+ hours late31 flights6.0%
Scale runs 0% to 100%.
Share of 521 completed flights by arrival against schedule.
22 of 132 late departures made up the time and arrived on time, 17% of them. In the other direction, 27 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at PBI.
The worst days
Worst days for JetBlue on ISP to PBI
The latest arrival of the period was on 18 July 2026, 25 hours 57 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 July 2026 | 25 hours 57 minutes | Extreme weather |
| 26 June 2026 | 17 hours 52 minutes | Carrier |
| 7 March 2026 | 8 hours 37 minutes | Late-arriving aircraft |
| 15 December 2025 | 6 hours 15 minutes | Late-arriving aircraft |
| 28 May 2026 | 5 hours 51 minutes | Late-arriving aircraft |
Delay causes
Why JetBlue runs late on this route
Late-arriving aircraft accounts for 47% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Late-arriving aircraft
- 23%Carrier
- 18%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 13,029 reported delay minutes.
47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 4 to one.
Cancellations run at 2.59%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
10.9% 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 76.8% on time across 542 flights, 3 points above 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. 540 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 ISP to PBI
Put together: treat all of this as provisional. 540 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 73.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 521 completed flights over 12 months sit behind that.
Related
Where to go next
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.