Flight profile · JetBlue
B6318
New York (JFK) to Boston (BOS) · scheduled 9:59 PM – 4:13 PM
How B6318 performs
738 operations, July 2023 – May 2026.
B6318 arrived on time 61.8% of the time, against 74.8% for all JFK → BOS flights, so this departure is 13.0 percentage points worse than the route as a whole. Against JetBlue’s own flights on this route it is 7.4 points worse.
Source: US DOT Bureau of Transportation Statistics · 738 operations, July 2023 – May 2026 · If B6318 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 B6318 compares to other flight numbers, not just to itself.
This flight's worst arrivals run unusually far past its typical one, a bigger gap than 93% of 11,788 comparable flight numbers.
A typical arrival is 0 min early, but the worst tenth run 100 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – May 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 B6318 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 |
|---|---|---|---|---|---|
| B6318 | 61.8% | 4.88% | 0 min | 20.4% | 738 |
| JetBlue on JFK → BOS | 69.2% | 3.18% | -4 min | 14.2% | 7,618 |
| All JFK → BOS flights | 74.8% | 3.33% | -8 min | 11.5% | 17,279 |
B6318 has cancelled 4.88% of its scheduled departures (36 of 738), against 3.33% for all JFK → BOS flights — this specific departure cancels 1.6 percentage points more often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about B6318 specifically, not about the route it flies.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – May 2026
Why B6318 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for B6318 on JFK → BOS. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – May 2026
Does a late aircraft delay this flight?
How often the plane that flies B6318 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, B6318 pushed back an average of 74 minutes late; when it came in on time or early, an average of 14 minutes late.
Each departure is matched to the flight the same aircraft flew into JFK just before it, using the tail number in the DOT file, 638 of 702 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 |
|---|---|---|---|
| B6318 | 30% | 75% | 27% |
| Network, same turn | 18% | 85% | 10% |
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 45 to 59 minutes. How often B6318’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often B6318 left 15 or more minutes late is lower 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 July 2023 – May 2026
From pushback to gate
When it leaves JFK late, does that still matter by the time it reaches BOS?
B6318 pushes back an average of 33.4 minutes late and reaches the gate at BOS an average of 23.6 minutes late. The 9.8 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 26.6 minutes on the taxiways at JFK, 3.7 minutes shorter than a typical JFK departure in the same hour.
On arrival at BOS, B6318 spends 7.5 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 1.4 minutes shorter than a typical BOS arrival (9.0 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 BOS. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 17,239 departures from JFK scheduled in the clock hour B6318 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at BOS (440,886 flights), not just B6318’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – May 2026
The hour it leaves JFK
Part of any flight’s record belongs to the clock rather than to the flight. B6318 has one departure time, so this is what that time is worth.
On-time arrival rate. 17,239 departures from JFK are scheduled in the 9 PM–10 PM hour over the period, against 351,635 across the whole day.
B6318 is scheduled out of JFK at 9:59 PM, in the 9 PM–10 PM bank. Departures from JFK in that hour arrive on time 68.4% of the time against 77.0% across the airport’s whole day — the slot alone is worth 8.7 points worse 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 – May 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.
100 min late
against a median of 0 min early
B6318 has an average that understates its risk: a typical arrival is 0 min early, but the worst tenth are 100 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 738 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – May 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| YX5765 | Republic Airways | 91.3% | 13 min early | 732 |
| YX5733 | Republic Airways | 86.6% | 10 min early | 784 |
| YX4659 | Republic Airways | 78.4% | 7 min early | 683 |
| DL2639 | Delta Air Lines | 66.3% | 5 min early | 744 |
| B61318 | JetBlue | 65.9% | 0 min early | 741 |
| B6318 this flight | JetBlue | 61.8% | 0 min early | 738 |
| B61118 | JetBlue | 60.8% | 2 min late | 914 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. B6318 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 738 records of B6318 operating JFK → BOS, 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
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