Flight number record
B6 513
JetBlue Airways · Islip to Fort Lauderdale
- Route
- ISP → FLL
- Departs
- 06:00
- Flights
- 342
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 513, check with JetBlue Airways.
B6 513 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 342 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so B6 513 runs 5 points behind the country as a whole. Across a thousand flights that is about 51 extra late arrivals.
Key figures
On time
72.2%
Arrivals under 15 minutes late, of 334 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
1.75%
National rate is 1.89%
1 hour+ late
11.1%
National rate is 8.3%
These figures cover 342 flights between September 2025 and August 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 513 flies
B6 513 flies ISP to FLL without a single fixed slot. Its most common scheduled departure was 06:00, used on 54 of 342 flights, with 12:25 (53 flights) next.
- Departs 06:0054 flights15.8%
- Departs 12:2553 flights15.5%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and B6 513 runs 17 points worse at 72.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
B6 513 next to ISP to FLL
Every carrier on ISP to FLL combined arrived on time 68.6% of the time across 418 flights, so B6 513 is 4 points ahead of it. Across its whole network JetBlue Airways managed 71.3%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 513thin sample | 342 | 72.2% | 89 min | 1.75% | C |
| All JetBlue Airways on ISP–FLL | 396 | 70.8% | 87 min | 1.77% | C |
| All carriers on ISP–FLL | 418 | 68.6% | 82 min | 1.91% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 513 quarter by quarter
B6 513 did not run the same all year. Its best quarter was Apr–Jun 2026 at 81.1% on time and its weakest Jan–Mar 2026 at 65.5%, a swing of 16 points on roughly 86 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 202518 flights—
- Oct–Dec 202582 flights65.9%
- Jan–Mar 202689 flights65.5%
- Apr–Jun 202691 flights81.1%
- Jul–Sep 202662 flights77.0%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, B6 513 did best on Wednesday at 86.5% on time and worst on Monday at 63.3%. Each day rests on about 49 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 513 runs when it is late
B6 513 often beats the schedule: 113 of 334 completed flights, 34%, arrived 15 minutes or more early. The 93 late arrivals split 28 under half an hour, 28 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early113 flights33.8%
- Within 15 min128 flights38.3%
- 15–29 min late28 flights8.4%
- 30–59 min late28 flights8.4%
- 1–2 hours late20 flights6.0%
- 2+ hours late17 flights5.1%
Scale runs 0% to 100%.
Share of 334 completed flights by arrival against schedule.
17 of 83 late departures made up the time and arrived on time, 20% 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 FLL.
The worst days
Worst days for B6 513
The latest arrival of the period was on 15 February 2026, 19 hours 51 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 February 2026 | 19 hours 51 minutes | Carrier |
| 26 December 2025 | 18 hours 49 minutes | Carrier |
| 30 December 2025 | 4 hours 42 minutes | Late-arriving aircraft |
| 22 March 2026 | 4 hours 7 minutes | Late-arriving aircraft |
| 3 July 2026 | 3 hours 15 minutes | Late-arriving aircraft |
Delay causes
Why B6 513 runs late
Late-arriving aircraft accounts for 43% of the 8,307 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 40%Carrier
- 16%National Airspace System
- 1%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,307 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 8,307 delay minutes reported on B6 513.
Cancellations sit at 1.75% against a national 1.89%, which is ordinary. Diversions add another 0.58%.
Connections and routes
What a delay on this flight costs
11.1% 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 1,092 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.
Every one of the 342 flights under B6 513 in the data flew ISP to FLL. 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. 342 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 513
For a booking, read B6 513 as 72.2% on time with 1.75% cancelled over 342 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.