Flight number record
B6 678
JetBlue Airways · Jacksonville to New York
- Route
- JAX → JFK
- Departs
- 17:12
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 363 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so B6 678 runs 6 points behind the country as a whole. Across a thousand flights that is about 63 extra late arrivals.
Key figures
On time
71.0%
Arrivals under 15 minutes late, of 334 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
7.71%
National rate is 1.89%
1 hour+ late
12.6%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 12.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 363 flights, with 17:36 (41 flights) next.
- Departs 17:1241 flights11.3%
- Departs 17:3641 flights11.3%
Scale runs 0% to 100%.
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 68.0%, and B6 678 runs 3 points better at 71.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
B6 678 next to JAX to JFK
Every carrier on JAX to JFK combined arrived on time 74.2% of the time across 1,188 flights, so B6 678 is 3 points behind it. JetBlue flew 891 flights on the same city pair under all its flight numbers, including this one, and those ran 77.2% on time. Across its whole network JetBlue Airways managed 71.3%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 678thin sample | 363 | 71.0% | 88 min | 7.71% | C− |
| All JetBlue Airways on JAX–JFK | 891 | 77.2% | 72 min | 5.50% | B− |
| All carriers on JAX–JFK | 1,188 | 74.2% | 93 min | 5.05% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | 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 Jul–Sep 2026 at 48.9%, a swing of 36 points on roughly 91 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%
- Jul–Sep 202662 flights48.9%
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, B6 678 did best on Monday at 78.6% on time and worst on Sunday at 56.5%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 678 runs when it is late
B6 678 often beats the schedule: 89 of 334 completed flights, 27%, arrived 15 minutes or more early. The 97 late arrivals split 28 under half an hour, 27 between 30 and 60 minutes, and 42 an hour or more.
- 15+ min early89 flights26.6%
- Within 15 min148 flights44.3%
- 15–29 min late28 flights8.4%
- 30–59 min late27 flights8.1%
- 1–2 hours late21 flights6.3%
- 2+ hours late21 flights6.3%
Scale runs 0% to 100%.
Share of 334 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 96 departures that left 15 minutes late or more, only 10 made it up before arrival. 11 flights left on time and still arrived late.
The worst days
Worst days for B6 678
The latest arrival of the period was on 7 June 2026, 14 hours 57 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 June 2026 | 14 hours 57 minutes | Late-arriving aircraft |
| 6 August 2026 | 6 hours 15 minutes | Late-arriving aircraft |
| 12 June 2026 | 5 hours 27 minutes | Carrier |
| 16 August 2026 | 4 hours 46 minutes | Late-arriving aircraft |
| 21 January 2026 | 4 hours 35 minutes | Late-arriving aircraft |
Delay causes
Why B6 678 runs late
Late-arriving aircraft accounts for 56% of the 8,489 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Late-arriving aircraft
- 21%National Airspace System
- 17%Carrier
- 6%Extreme weather
56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,489 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 8,489 delay minutes reported on B6 678.
Cancellations run at 7.71%, against 1.89% nationally. That is roughly one flight in twelve 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
12.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The same number turns up on one other city pair in the data, including JFK to JAX (2), 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. 363 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: 7.71% of its 363 scheduled flights did not operate. A late arrival costs an hour and a half, 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 route92.1%
- Jacksonville International (JAX) delay statistics
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.