Flight number record
B6 1004
JetBlue Airways · San Juan to New York
- Route
- SJU → JFK
- Departs
- 15:24
- Flights
- 254
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 1004, check with JetBlue Airways.
B6 1004 draws a D−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 254 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so B6 1004 runs 13 points behind the country as a whole. Across a thousand flights that is about 131 extra late arrivals.
Key figures
On time
64.2%
Arrivals under 15 minutes late, of 226 completed flights
Avg delay
99 min
Across delayed arrivals only, not all flights
Cancelled
10.63%
National rate is 1.89%
1 hour+ late
18.1%
National rate is 8.3%
These figures cover 254 flights between September 2025 and August 2026. Beyond the headline rate, 18.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 1004 flies
B6 1004 flies SJU to JFK without a single fixed slot. Its most common scheduled departure was 15:24, used on 66 of 254 flights, with 14:20 (40 flights) next.
- Departs 15:2466 flights26.0%
- Departs 14:2040 flights15.7%
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 15:24 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 1004 runs 8 points worse at 64.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
B6 1004 next to SJU to JFK
Every carrier on SJU to JFK combined arrived on time 77.8% of the time across 3,560 flights, so B6 1004 is 14 points behind it. JetBlue flew 2,250 flights on the same city pair under all its flight numbers, including this one, and those ran 72.4% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 1004thin sample | 254 | 64.2% | 99 min | 10.63% | D− |
| All JetBlue Airways on SJU–JFK | 2,250 | 72.4% | 85 min | 4.84% | C− |
| All carriers on SJU–JFK | 3,560 | 77.8% | 82 min | 3.93% | B− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 1004 quarter by quarter
B6 1004 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.5% on time and its weakest Jul–Sep 2026 at 40.9%, a swing of 42 points on roughly 64 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 20252 flights—
- Oct–Dec 202562 flights72.4%
- Jan–Mar 202670 flights55.4%
- Apr–Jun 202659 flights82.5%
- Jul–Sep 202661 flights40.9%
Scale runs 30% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, B6 1004 did best on Tuesday at 75.0% on time and worst on Saturday at 59.4%. Each day rests on about 36 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 1004 runs when it is late
When B6 1004 is late it tends to be very late: 41 of its 81 late arrivals were an hour or more behind, and 19 were two hours or more.
- 15+ min early48 flights21.2%
- Within 15 min97 flights42.9%
- 15–29 min late21 flights9.3%
- 30–59 min late19 flights8.4%
- 1–2 hours late22 flights9.7%
- 2+ hours late19 flights8.4%
Scale runs 0% to 100%.
Share of 226 completed flights by arrival against schedule.
21 of 96 late departures made up the time and arrived on time, 22% of them. 6 flights left on time and still arrived late.
The worst days
Worst days for B6 1004
The latest arrival of the period was on 4 January 2026, 12 hours 1 minute behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 January 2026 | 12 hours 1 minute | Carrier |
| 22 January 2026 | 6 hours 50 minutes | Late-arriving aircraft |
| 2 March 2026 | 6 hours 30 minutes | Late-arriving aircraft |
| 19 January 2026 | 6 hours 3 minutes | Late-arriving aircraft |
| 6 July 2026 | 4 hours 29 minutes | Carrier |
Delay causes
Why B6 1004 runs late
Late-arriving aircraft accounts for 48% of the 7,983 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 44%Carrier
- 7%National Airspace System
- 1%Extreme weather
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,983 reported delay minutes here, that single category outweighs weather by 48 to one. The split is drawn from 7,983 delay minutes reported on B6 1004.
Cancellations run at 10.63%, against 1.89% nationally. That is about one flight in nine 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 routes
What a delay on this flight costs
18.1% 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.
At 1,598 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 254 flights under B6 1004 in the data flew SJU to JFK. 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. 254 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 1004
For a booking, the cancellation rate is the figure to plan around on B6 1004: 10.63% of its 254 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SJU to JFK, every carrier and departure
- JFK to SJU, the return direction
- Delta Air Lines 1854 on the same route92.5%
- JetBlue Airways 1604 on the same route79.9%
- JetBlue Airways 904 on the same route77.7%
- Delta Air Lines 1961 on the same route87.7%
- Delta Air Lines 1966 on the same route83.6%
- Luis Munoz Marin International (SJU) delay statistics
- John F. Kennedy International (JFK) 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.