Flight number record
B6 545
JetBlue Airways · Islip to West Palm Beach
- Route
- ISP → PBI
- Departs
- 13:55
- Flights
- 358
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s B6 545, check with JetBlue Airways.
B6 545 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 10 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 358 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so B6 545 runs 10 points behind the country as a whole. Across a thousand flights that is about 95 extra late arrivals.
Key figures
On time
68.1%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
1.68%
National rate is 1.81%
1 hour+ late
14.4%
National rate is 8.1%
These figures cover 358 flights between July 2025 and June 2026. Beyond the headline rate, 14.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When B6 545 flies
B6 545 flies ISP to PBI without a single fixed slot. Its most common scheduled departure was 13:55, used on 53 of 358 flights, with 15:00 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:5553 flights14.8%
- Departs 15:0041 flights11.5%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:55 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 545 runs 11 points worse at 68.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
B6 545 next to ISP to PBI
Every carrier on ISP to PBI combined arrived on time 71.9% of the time across 1,223 flights, so B6 545 is 4 points behind it. JetBlue flew 541 flights on the same city pair under all its flight numbers, including this one, and those ran 72.7% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 545thin sample | 358 | 68.1% | 91 min | 1.68% | C |
| All JetBlue Airways on ISP–PBI | 541 | 72.7% | 93 min | 2.40% | C |
| All carriers on ISP–PBI | 1,223 | 71.9% | 70 min | 2.13% | C |
| JetBlue Airways, whole network | 234,468 | 72.7% | 76 min | 2.56% | C |
Across the year
B6 545 quarter by quarter
B6 545 did not run the same all year. Its best quarter was Apr–Jun 2026 at 77.0% on time and its weakest Jan–Mar 2026 at 55.6%, a swing of 21 points on roughly 90 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202592 flights68.1%
- Oct–Dec 202592 flights70.8%
- Jan–Mar 202686 flights55.6%
- Apr–Jun 202688 flights77.0%
Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, B6 545 did best on Monday at 78.0% on time and worst on Thursday at 60.0%. Each day rests on about 51 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why B6 545 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 10,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 43%Late-arriving aircraft
- 31%Carrier
- 23%National Airspace System
- 3%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 10,000 reported delay minutes here, that single category outweighs weather by 15 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 10,106 delay minutes reported on B6 545.
Cancellations sit at 1.68% against a national 1.81%, which is ordinary. Diversions add another 1.12%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 358 flights under B6 545 in the data flew ISP to PBI. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 358 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 B6 545
For a booking, B6 545 is a flight to put a long connection behind. 14.4% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- ISP to PBI, every carrier and departure
- PBI to ISP, the return direction
- JetBlue Airways on-time record
- Every JetBlue Airways flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means JetBlue Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.