Flight number record
B6 517
JetBlue Airways · Boston to New York
- Route
- BOS → JFK
- Departs
- 13:40
- Flights
- 259
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 517, check with JetBlue Airways.
B6 517 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 259 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so B6 517 runs 11 points behind the country as a whole. Across a thousand flights that is about 113 extra late arrivals.
Key figures
On time
66.0%
Arrivals under 15 minutes late, of 247 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
4.63%
National rate is 1.89%
1 hour+ late
13.8%
National rate is 8.3%
These figures cover 259 flights between September 2025 and August 2026. Beyond the headline rate, 13.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 517 flies
B6 517 flies BOS to JFK without a single fixed slot. Its most common scheduled departure was 13:40, used on 76 of 259 flights, with 14:55 (34 flights) next.
- Departs 13:4076 flights29.3%
- Departs 14:5534 flights13.1%
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 13:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and B6 517 runs 12 points worse at 66.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
B6 517 next to BOS to JFK
Every carrier on BOS to JFK combined arrived on time 74.2% of the time across 5,614 flights, so B6 517 is 8 points behind it. JetBlue flew 2,389 flights on the same city pair under all its flight numbers, including this one, and those ran 70.8% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 517thin sample | 259 | 66.0% | 76 min | 4.63% | C− |
| All JetBlue Airways on BOS–JFK | 2,389 | 70.8% | 79 min | 5.44% | C− |
| All carriers on BOS–JFK | 5,614 | 74.2% | 71 min | 5.58% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 517 quarter by quarter
B6 517 did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.0% on time and its weakest Oct–Dec 2025 at 59.3%, a swing of 21 points on roughly 86 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 202591 flights59.3%
- Jan–Mar 202690 flights61.9%
- Apr–Jun 202650 flights80.0%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, B6 517 did best on Tuesday at 80.0% on time and worst on Monday at 47.1%. Each day rests on about 37 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 517 runs when it is late
The 84 late arrivals split 24 under half an hour, 26 between 30 and 60 minutes, and 34 an hour or more.
- 15+ min early59 flights23.9%
- Within 15 min104 flights42.1%
- 15–29 min late24 flights9.7%
- 30–59 min late26 flights10.5%
- 1–2 hours late23 flights9.3%
- 2+ hours late11 flights4.5%
Scale runs 0% to 100%.
Share of 247 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 88 departures that left 15 minutes late or more, only 10 made it up before arrival. 6 flights left on time and still arrived late.
The worst days
Worst days for B6 517
The latest arrival of the period was on 17 February 2026, 7 hours 55 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 February 2026 | 7 hours 55 minutes | Late-arriving aircraft |
| 30 October 2025 | 6 hours 12 minutes | National Airspace System |
| 25 February 2026 | 6 hours | Late-arriving aircraft |
| 20 December 2025 | 4 hours 24 minutes | Late-arriving aircraft |
| 12 October 2025 | 4 hours 8 minutes | National Airspace System |
Delay causes
Why B6 517 runs late
Late-arriving aircraft accounts for 52% of the 6,354 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 26%National Airspace System
- 21%Carrier
- 1%Extreme weather
- 0%Security
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,354 reported delay minutes here, that single category outweighs weather by 52 to one. The split is drawn from 6,354 delay minutes reported on B6 517.
Cancellations run at 4.63%, against 1.89% nationally. That is about one flight in twenty 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
13.8% 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 same number turns up on one other city pair in the data, including ATL to FLL (54), but none flew often enough under B6 517 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to JFK only.
One caution: this is a thin sample. 259 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 517
For a booking, the cancellation rate is the figure to plan around on B6 517: 4.63% of its 259 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
- BOS to JFK, every carrier and departure
- JFK to BOS, the return direction
- Republic Airways 5720 on the same route85.1%
- JetBlue Airways 717 on the same route60.3%
- Delta Air Lines 2611 on the same route92.3%
- Republic Airways 5808 on the same route73.8%
- JetBlue Airways 1017 on the same route64.9%
- Republic Airways 5814 on the same route63.2%
- Boston Logan International (BOS) 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.