Flight profile · JetBlue
B6391
Boston (BOS) to Tampa (TPA) · scheduled 6:20 PM – 9:40 PM
How B6391 performs
611 operations, February 2024 – July 2026.
B6391 arrived on time 59.7% of the time, against 73.8% for all BOS → TPA flights, so this departure is 14.1 percentage points worse than the route as a whole. Against JetBlue’s own flights on this route it is 12.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 611 operations, February 2024 – July 2026 · If B6391 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How B6391 compares to other flight numbers, not just to itself.
This flight runs unusually far behind the carrier's own average on this route, worse than 93% of 11,589 comparable flight numbers.
59.7% on time for this specific departure, against 72.4% for the same carrier's other flights on this route.
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where B6391 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 |
|---|---|---|---|---|---|
| B6391 | 59.7% | 2.29% | 4 min | 17.2% | 611 |
| JetBlue on BOS → TPA | 72.4% | 2.67% | -5 min | 11.6% | 4,684 |
| All BOS → TPA flights | 73.8% | 2.31% | -6 min | 11.0% | 8,553 |
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026
Why B6391 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 and fueling, all 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 B6391 on BOS → TPA. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering February 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies B6391 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, B6391 pushed back an average of 71 minutes late; when it came in on time or early, an average of 8 minutes late.
Each departure is matched to the flight the same aircraft flew into BOS just before it, using the tail number in the DOT file, 491 of 597 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 |
|---|---|---|---|
| B6391 | 30% | 87% | 21% |
| 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 B6391’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often B6391 left 15 or more minutes late is higher than 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 February 2024 – July 2026
From pushback to gate
When it leaves BOS late, does that still matter by the time it reaches TPA?
B6391 pushes back an average of 31.8 minutes late and reaches the gate at TPA an average of 22.7 minutes late. The 9.1 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 21.2 minutes on the taxiways at BOS, 2.3 minutes shorter than a typical BOS departure in the same hour.
On arrival at TPA, B6391 spends 6.8 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 TPA 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 TPA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 27,363 departures from BOS scheduled in the clock hour B6391 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at TPA (242,635 flights), not just B6391’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026
The hour it leaves BOS
Part of any flight’s record belongs to the clock rather than to the flight. B6391 has one departure time, so this is what that time is worth.
On-time arrival rate. 27,363 departures from BOS are scheduled in the 6 PM–7 PM hour over the period, against 440,893 across the whole day.
B6391 is scheduled out of BOS at 6:20 PM, in the 6 PM–7 PM bank. Departures from BOS in that hour arrive on time 66.3% of the time against 77.2% across the airport’s whole day — the slot alone is worth 10.9 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from BOS 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 · February 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes B6391 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| BUF→JFK Buffalo to New York | October 27, 2024 – February 12, 2025 | 106 | 67.0% |
Because the same number has served different journeys, the statistics above describe only the route B6391 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
96 min late
against a median of 4 min late
B6391 has an average that understates its risk: a typical arrival is 4 min late, but the worst tenth are 92 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 611 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering February 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL2706 | Delta Air Lines | 89.1% | 12 min early | 762 |
| B6891 | JetBlue | 85.0% | 10 min early | 983 |
| DL1439 | Delta Air Lines | 68.2% | 1 min early | 916 |
| B6591 | JetBlue | 65.2% | 0 min early | 962 |
| DL2234 | Delta Air Lines | 63.6% | 2 min early | 617 |
| B6391 this flight | JetBlue | 59.7% | 4 min late | 611 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. B6391 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 611 records of B6391 operating BOS → TPA, 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