Flight number record

B6 517

JetBlue Airways · Boston to New York

Route: BOS → JFK
Departs: 13:40
Flights: 259
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%, so B6 517 runs 12 points behind the country as a whole. Across a thousand flights that is about 116 extra late arrivals.

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 1.81%

1 hour+ late

13.8%

National rate is 8.1%

These figures cover 259 flights between July 2025 and June 2026. Beyond the headline rate, 13.8% 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 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. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:4076 flights29.3%
Departs 14:5534 flights13.1%

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 13:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 517 runs 13 points worse at 66.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 517 next to BOS to JFK

Every carrier on BOS to JFK combined arrived on time 75.5% of the time across 5,738 flights, so B6 517 is 10 points behind it. JetBlue flew 2,455 flights on the same city pair under all its flight numbers, including this one, and those ran 73.6% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 7 points.

B6 517 against its route and carrier
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	2,455	73.6%	81 min	4.24%	C−
All carriers on BOS–JFK	5,738	75.5%	73 min	4.55%	B−
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	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.

Delay causes

Why B6 517 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 6,354 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.

Late-arriving aircraft
52%
National Airspace System
26%
Carrier
21%
Extreme weather
1%
Security
0%

52% 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 6,354 reported delay minutes here, that single category outweighs weather by 52 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 6,354 delay minutes reported on B6 517.

Cancellations run at 4.63%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.8% 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.

Every one of the 259 flights under B6 517 in the data flew BOS to JFK. 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. 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.

Where to go next

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.

Key figures