Flight number record
B6 678
JetBlue Airways · Jacksonville to New York
- Route
- JAX → JFK
- Departs
- 17:12
- Flights
- 301
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s B6 678, check with JetBlue Airways.
B6 678 sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 301 flights, with a median arrival 6 minutes early.
Key figures
On time
74.4%
Arrivals under 15 minutes late, of 289 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
3.65%
National rate is 1.81%
1 hour+ late
9.7%
National rate is 8.1%
These figures cover 301 flights between July 2025 and June 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When B6 678 flies
B6 678 flies JAX to JFK without a single fixed slot. Its most common scheduled departure was 17:12, used on 41 of 301 flights, with 10:00 (35 flights) and 10:43 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:1241 flights13.6%
- Departs 10:0035 flights11.6%
- Departs 10:4333 flights11.0%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:12 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and B6 678 runs 6 points better at 74.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
B6 678 next to JAX to JFK
Every carrier on JAX to JFK combined arrived on time 74.4% of the time across 1,187 flights, so B6 678 is about level with it. JetBlue flew 891 flights on the same city pair under all its flight numbers, including this one, and those ran 77.0% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 678thin sample | 301 | 74.4% | 81 min | 3.65% | C− |
| All JetBlue Airways on JAX–JFK | 891 | 77.0% | 70 min | 4.04% | B− |
| All carriers on JAX–JFK | 1,187 | 74.4% | 87 min | 3.79% | C− |
| JetBlue Airways, whole network | 234,468 | 72.7% | 76 min | 2.56% | C |
Across the year
B6 678 quarter by quarter
B6 678 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.5% on time and its weakest Oct–Dec 2025 at 63.6%, a swing of 21 points on roughly 100 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202528 flights—
- Oct–Dec 202592 flights63.6%
- Jan–Mar 202690 flights84.5%
- Apr–Jun 202691 flights76.7%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, B6 678 did best on Wednesday at 81.4% on time and worst on Sunday at 61.5%. Each day rests on about 43 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Delay causes
Why B6 678 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 57% of the 5,963 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 57%Late-arriving aircraft
- 21%National Airspace System
- 20%Carrier
- 3%Extreme weather
57% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,963 reported delay minutes here, that single category outweighs weather by 21 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,963 delay minutes reported on B6 678.
Cancellations run at 3.65%, against 1.81% nationally. That is roughly one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 829 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on one other city pair in the data, including JFK to JAX (64), but none flew often enough under B6 678 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to JAX to JFK only.
One caution: this is a thin sample. 301 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking B6 678
For a booking, the cancellation rate is the figure to plan around on B6 678: 3.65% of its 301 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JAX to JFK, every carrier and departure
- JFK to JAX, the return direction
- JetBlue Airways 1678 on the same route91.0%
- John F. Kennedy International (JFK) delay statistics
- JetBlue Airways on-time record
- Every JetBlue Airways flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means JetBlue Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.