Flight number record

B6 514

JetBlue Airways · Fort Lauderdale to Islip

Route: FLL → ISP
Departs: 08:00
Flights: 343
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 514, check with JetBlue Airways.

B6 514 lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 343 flights, with a median arrival 4 minutes early.

On time

77.3%

Arrivals under 15 minutes late, of 335 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

1.75%

National rate is 1.81%

1 hour+ late

9.3%

National rate is 8.1%

These figures cover 343 flights between July 2025 and June 2026. Beyond the headline rate, 9.3% 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 514 flies

B6 514 flies FLL to ISP without a single fixed slot. Its most common scheduled departure was 08:00, used on 52 of 343 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:0052 flights15.2%

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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and B6 514 runs 7 points worse at 77.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

B6 514 next to FLL to ISP

Every carrier on FLL to ISP combined arrived on time 74.7% of the time across 393 flights, so B6 514 is 3 points ahead of it. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 5 points.

B6 514 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 514thin sample	343	77.3%	62 min	1.75%	B
All JetBlue Airways on FLL–ISP	371	76.5%	60 min	1.89%	B
All carriers on FLL–ISP	393	74.7%	63 min	2.04%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 514 quarter by quarter

B6 514 did not run the same all year. Its best quarter was Jul–Sep 2025 at 92.5% on time and its weakest Jan–Mar 2026 at 67.9%, a swing of 25 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 202580 flights92.5%
Oct–Dec 202582 flights73.2%
Jan–Mar 202690 flights67.9%
Apr–Jun 202691 flights76.4%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, B6 514 did best on Wednesday at 94.0% on time and worst on Sunday at 56.8%. Each day rests on about 49 flights, so a gap of 37 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 514 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 4,725 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
49%
Carrier
36%
National Airspace System
13%
Extreme weather
1%
Security
0%

49% 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 4,725 reported delay minutes here, that single category outweighs weather by 33 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 4,725 delay minutes reported on B6 514.

Cancellations sit at 1.75% against a national 1.81%, which is ordinary. Diversions add another 0.58%.

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. 9.3% 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.

The 1,092 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 343 flights under B6 514 in the data flew FLL to ISP. 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. 343 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 514

For a booking, read B6 514 as 77.3% on time with 1.75% cancelled over 343 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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