Flight profile · JetBlue
B6503
New York (JFK) to San Juan (SJU) · scheduled 8:00 AM – 12:52 PM
How B6503 performs
1,016 operations, July 2023 – July 2026.
B6503 arrived on time 74.8% of the time, against 70.5% for all JFK → SJU flights, so this departure is 4.3 percentage points better than the route as a whole. Against JetBlue’s own flights on this route it is 8.0 points better.
Source: US DOT Bureau of Transportation Statistics · 1,016 operations, July 2023 – July 2026 · If B6503 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where B6503 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 |
|---|---|---|---|---|---|
| B6503 | 74.8% | 1.87% | -5 min | 9.4% | 1,016 |
| JetBlue on JFK → SJU | 66.8% | 2.06% | -1 min | 14.7% | 6,846 |
| All JFK → SJU flights | 70.5% | 1.68% | -4 min | 11.9% | 11,338 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why B6503 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
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for B6503 on JFK → SJU. 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 B6503 comes in late, and what that does to the departure.
The aircraft flying B6503 came in 15 or more minutes late on 15% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into JFK just before it, using the tail number in the DOT file, 584 of 997 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 |
|---|---|
| B6503 | 15% |
| Network, same turn | 23% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 90 minutes to 3 hours. How often B6503’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
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 JFK late, does that still matter by the time it reaches SJU?
B6503 pushes back an average of 18.2 minutes late and reaches the gate at SJU an average of 11.5 minutes late. The 6.8 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 24.3 minutes on the taxiways at JFK, 3.5 minutes shorter than a typical JFK departure in the same hour.
On arrival at SJU, B6503 spends 6.1 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 about what any arrival at SJU spends on the ground before reaching the gate.
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 SJU. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 30,531 departures from JFK scheduled in the clock hour B6503 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SJU (109,607 flights), not just B6503’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves JFK
Part of any flight’s record belongs to the clock rather than to the flight. B6503 has one departure time, so this is what that time is worth.
On-time arrival rate. 30,531 departures from JFK are scheduled in the 8 AM–9 AM hour over the period, against 351,635 across the whole day.
B6503 is scheduled out of JFK at 8:00 AM, in the 8 AM–9 AM bank. Departures from JFK in that hour arrive on time 83.6% of the time against 77.0% across the airport’s whole day — the slot alone is worth 6.6 points better before anything about this particular flight is considered.
The two airport figures cover every departure from JFK 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.
By day of week
Does B6503 run worse on particular days?
Wednesday is historically the most reliable day and Thursday the least, a gap of 16.0 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
54 min late
against a median of 5 min early
Percentiles over 1,016 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 |
|---|---|---|---|---|
| DL1877 | Delta Air Lines | 87.5% | 14 min early | 737 |
| DL1961 | Delta Air Lines | 86.6% | 14 min early | 1,082 |
| B61603 | JetBlue | 78.5% | 7 min early | 794 |
| B6503 this flight | JetBlue | 74.8% | 5 min early | 1,016 |
| DL1859 | Delta Air Lines | 67.7% | 1 min early | 1,092 |
| B61903 | JetBlue | 64.1% | 2 min late | 661 |
| B6803 | JetBlue | 63.8% | 1 min late | 948 |
| B6403 | JetBlue | 63.1% | 2 min late | 768 |
| B62903 | JetBlue | 59.7% | 5 min late | 727 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. B6503 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 1,016 records of B6503 operating JFK → SJU, 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