Flight number record
B6 845
JetBlue Airways · Boston to Syracuse
- Route
- BOS → SYR
- Departs
- 21:35
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 845, check with JetBlue Airways.
B6 845 earns a D−, which is as low as this site's scale goes for a reason. Only 57.3% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 358 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so B6 845 runs 20 points behind the country as a whole. Across a thousand flights that is about 200 extra late arrivals.
Key figures
On time
57.3%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
3.91%
National rate is 1.89%
1 hour+ late
20.1%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. Beyond the headline rate, 20.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 845 flies
B6 845 flies BOS to SYR without a single fixed slot. Its most common scheduled departure was 21:35, used on 75 of 358 flights, with 21:40 (58 flights) and 18:40 (38 flights) next.
- Departs 21:3575 flights20.9%
- Departs 21:4058 flights16.2%
- Departs 18:4038 flights10.6%
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 21:35 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and B6 845 runs 13 points worse at 57.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
B6 845 next to BOS to SYR
Every carrier on BOS to SYR combined arrived on time 68.2% of the time across 505 flights, so B6 845 is 11 points behind it. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 845thin sample | 358 | 57.3% | 70 min | 3.91% | D− |
| All JetBlue Airways on BOS–SYRthin sample | 358 | 57.3% | 70 min | 3.91% | D− |
| All carriers on BOS–SYR | 505 | 68.2% | 69 min | 2.77% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 845 quarter by quarter
B6 845 did not run the same all year. Its best quarter was Oct–Dec 2025 at 67.0% on time and its weakest Jul–Sep 2026 at 50.0%, a swing of 17 points on roughly 90 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 202524 flights—
- Oct–Dec 202591 flights67.0%
- Jan–Mar 202690 flights54.1%
- Apr–Jun 202691 flights57.1%
- Jul–Sep 202662 flights50.0%
Scale runs 40% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, B6 845 did best on Monday at 70.2% on time and worst on Sunday at 45.8%. Each day rests on about 51 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 845 runs when it is late
The 147 late arrivals split 34 under half an hour, 44 between 30 and 60 minutes, and 69 an hour or more.
- 15+ min early75 flights21.8%
- Within 15 min122 flights35.5%
- 15–29 min late34 flights9.9%
- 30–59 min late44 flights12.8%
- 1–2 hours late45 flights13.1%
- 2+ hours late24 flights7.0%
Scale runs 0% to 100%.
Share of 344 completed flights by arrival against schedule.
28 of 169 late departures made up the time and arrived on time, 17% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for B6 845
The latest arrival of the period was on 29 July 2026, 4 hours 3 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 July 2026 | 4 hours 3 minutes | Carrier |
| 22 June 2026 | 3 hours 53 minutes | Late-arriving aircraft |
| 2 December 2025 | 3 hours 44 minutes | Late-arriving aircraft |
| 21 July 2026 | 3 hours 18 minutes | Late-arriving aircraft |
| 11 June 2026 | 3 hours 16 minutes | Carrier |
Delay causes
Why B6 845 runs late
Late-arriving aircraft accounts for 61% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 34%Carrier
- 4%National Airspace System
- 1%Extreme weather
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 10,000 reported delay minutes here, that single category outweighs weather by 51 to one. The split is drawn from 10,261 delay minutes reported on B6 845.
Cancellations run at 3.91%, against 1.89% nationally. That is about 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
20.1% 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.
Every one of the 358 flights under B6 845 in the data flew BOS to SYR. 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. 358 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 845
For a booking, the cancellation rate is the figure to plan around on B6 845: 3.91% of its 358 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
- Boston Logan International (BOS) 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.