Flight profile · JetBlue
B6904
San Juan (SJU) to New York (JFK) · scheduled 10:35 AM – 2:30 PM
How B6904 performs
827 operations, July 2023 – July 2026.
B6904 arrived on time 74.5% of the time, against 79.0% for all SJU → JFK flights, so this departure is 4.5 percentage points worse than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 827 operations, July 2023 – July 2026 · If B6904 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where B6904 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| B6904 | 74.5% | 2.30% | -6 min | 10.2% | 827 |
| JetBlue on SJU → JFK | 75.2% | 2.28% | -7 min | 11.1% | 6,850 |
| All SJU → JFK flights | 79.0% | 1.80% | -9 min | 8.8% | 11,345 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why B6904 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for B6904 on SJU → JFK. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies B6904 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, B6904 pushed back an average of 51 minutes late; when it came in on time or early, an average of 10 minutes late.
Each departure is matched to the flight the same aircraft flew into SJU just before it, using the tail number in the DOT file, 713 of 809 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| B6904 | 23% | 70% | 17% |
| Network, same turn | 17% | 68% | 9% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often B6904’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often B6904 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves SJU late, does that still matter by the time it reaches JFK?
B6904 pushes back an average of 25.4 minutes late and reaches the gate at JFK an average of 14.2 minutes late. The 11.2 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 13.5 minutes on the taxiways at SJU, 1.5 minutes shorter than a typical SJU departure in the same hour.
On arrival at JFK, B6904 spends 8.3 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 3.2 minutes shorter than a typical JFK arrival (11.5 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached JFK. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 3,513 departures from SJU scheduled in the clock hour B6904 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at JFK (351,546 flights), not just B6904’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves SJU
Part of any flight’s record belongs to the clock rather than to the flight. B6904 has one departure time, so this is what that time is worth.
On-time arrival rate. 3,513 departures from SJU are scheduled in the 10 AM–11 AM hour over the period, against 109,598 across the whole day.
B6904 is scheduled out of SJU at 10:35 AM, in the 10 AM–11 AM bank. Departures from SJU in that hour arrive on time 82.3% of the time against 76.2% across the airport’s whole day — the slot alone is worth 6.1 points better before anything about this particular flight is considered.
The two airport figures cover every departure from SJU to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
60 min late
against a median of 6 min early
B6904 has an average that understates its risk: a typical arrival is 6 min early, but the worst tenth are 66 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 827 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1854 | Delta Air Lines | 93.9% | 14 min early | 1,127 |
| DL1961 | Delta Air Lines | 87.5% | 14 min early | 836 |
| DL1877 | Delta Air Lines | 85.4% | 14 min early | 699 |
| B61604 | JetBlue | 81.0% | 10 min early | 1,003 |
| B6904 this flight | JetBlue | 74.5% | 6 min early | 827 |
| B62404 | JetBlue | 65.7% | 1 min early | 639 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. B6904 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 827 records of B6904 operating SJU → JFK, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed