Flight profile · JetBlue
B6521
Boston (BOS) to West Palm Beach (PBI) · scheduled 2:00 PM – 5:15 PM
How B6521 performs
337 operations, 2023-07-01 to 2026-04-29.
B6521 arrived on time 64.3% of the time, against 68.2% for all BOS → PBI flights — this specific departure is 3.9 percentage points worse than the route as a whole. Against JetBlue’s own flights on this route it is 1.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 337 operations between 2023-07-01 to 2026-04-29
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| B6521 | 64.3% | 0.00% | 3 min | 14.0% | 337 |
| JetBlue on BOS → PBI | 65.8% | 1.90% | 1 min | 14.5% | 4,516 |
| All BOS → PBI flights | 68.2% | 1.78% | -1 min | 13.2% | 6,225 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-04-29
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
84 min late
against a median of 3 min late
B6521 is a flight whose average understates its risk: a typical day arrives 3 min late, but the worst tenth of days are 81 minutes worse than that. If the day has something unmissable in it, the median is the wrong number to plan against.
Percentiles over 337 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why B6521 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
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 B6521 on BOS → PBI. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on BOS → PBI
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1245 | Delta Air Lines | 82.7% | 11 min early | 720 |
| B6321 | JetBlue | 66.9% | 1 min late | 678 |
| DL2160 | Delta Air Lines | 63.4% | 2 min late | 720 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 337 records of B6521 operating BOS → PBI, 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.
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