Flight number record
B6 109
JetBlue Airways · Boston to Jacksonville
- Route
- BOS → JAX
- Departs
- 07:00
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 109, check with JetBlue Airways.
B6 109 earns a B−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 363 flights, with a median arrival 14 minutes early.
Set against the rest of the country, B6 109's record is 8 points better than the US average of 77.3%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.
Key figures
On time
84.8%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
3.58%
National rate is 1.89%
1 hour+ late
6.6%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. The median arrival is 14 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When B6 109 flies
B6 109 flies BOS to JAX without a single fixed slot. Its most common scheduled departure was 07:00, used on 50 of 363 flights, with 08:00 (37 flights) next.
- Departs 07:0050 flights13.8%
- Departs 08:0037 flights10.2%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and B6 109 runs 5 points worse at 84.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
B6 109 next to BOS to JAX
Every carrier on BOS to JAX combined arrived on time 74.3% of the time across 1,625 flights, so B6 109 is 11 points ahead of it. JetBlue flew 665 flights on the same city pair under all its flight numbers, including this one, and those ran 75.9% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 109thin sample | 363 | 84.8% | 64 min | 3.58% | B− |
| All JetBlue Airways on BOS–JAX | 665 | 75.9% | 71 min | 3.76% | B− |
| All carriers on BOS–JAX | 1,625 | 74.3% | 68 min | 2.89% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 109 quarter by quarter
B6 109 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 70.7%, a swing of 26 points on roughly 73 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 202530 flights96.7%
- Oct–Dec 202591 flights83.1%
- Jan–Mar 202690 flights70.7%
- Apr–Jun 202690 flights90.0%
- Jul–Sep 202662 flights93.0%
Scale runs 60% to 100%.
By weekday, B6 109 ranged from 80.8% on Thursday to 90.2% on Wednesday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late B6 109 runs when it is late
B6 109 often beats the schedule: 163 of 348 completed flights, 47%, arrived 15 minutes or more early. The 53 late arrivals split 17 under half an hour, 13 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early163 flights46.8%
- Within 15 min132 flights37.9%
- 15–29 min late17 flights4.9%
- 30–59 min late13 flights3.7%
- 1–2 hours late17 flights4.9%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 348 completed flights by arrival against schedule.
15 of 55 late departures made up the time and arrived on time, 27% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for B6 109
The latest arrival of the period was on 24 January 2026, 4 hours 23 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 January 2026 | 4 hours 23 minutes | National Airspace System |
| 1 January 2026 | 3 hours 27 minutes | Carrier |
| 7 February 2026 | 2 hours 59 minutes | National Airspace System |
| 26 December 2025 | 2 hours 51 minutes | Carrier |
| 30 January 2026 | 2 hours 28 minutes | Late-arriving aircraft |
Delay causes
Why B6 109 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,381 reported delay minutes.
- 42%Carrier
- 42%National Airspace System
- 11%Late-arriving aircraft
- 5%Extreme weather
42% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,407 minutes out of 3,381, against a national NAS share of 21%. The split is drawn from 3,381 delay minutes reported on B6 109.
Cancellations run at 3.58%, against 1.89% nationally. That is about one flight in 30 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
6.6% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 1,011 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.
Every one of the 363 flights under B6 109 in the data flew BOS to JAX. The number was not reused on any other city pair, which makes this a clean record of one route.
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 109
For a booking, the cancellation rate is the figure to plan around on B6 109: 3.58% of its 363 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to JAX, every carrier and departure
- JAX to BOS, the return direction
- Boston Logan International (BOS) delay statistics
- Jacksonville International (JAX) 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
- What a cancellation rate actually tells you (and what it hides)
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.