Flight number record

B6 1004

JetBlue Airways · San Juan to New York

Route: SJU → JFK
Departs: 14:20
Flights: 255
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1004, check with JetBlue Airways.

B6 1004 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land close to two hours behind schedule. That rests on 255 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so B6 1004 runs 9 points behind the country as a whole. Across a thousand flights that is about 86 extra late arrivals.

On time

69.0%

Arrivals under 15 minutes late, of 242 completed flights

Avg delay

104 min

Across delayed arrivals only, not all flights

Cancelled

4.71%

National rate is 1.81%

1 hour+ late

15.3%

National rate is 8.1%

These figures cover 255 flights between July 2025 and June 2026. Beyond the headline rate, 15.3% 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 1004 flies

B6 1004 flies SJU to JFK without a single fixed slot. Its most common scheduled departure was 14:20, used on 40 of 255 flights, with 14:55 (31 flights) and 15:00 (27 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:2040 flights15.7%
Departs 14:5531 flights12.2%
Departs 15:0027 flights10.6%

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 14:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and B6 1004 runs 3 points worse at 69.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 1004 next to SJU to JFK

Every carrier on SJU to JFK combined arrived on time 79.3% of the time across 3,657 flights, so B6 1004 is 10 points behind it. JetBlue flew 2,237 flights on the same city pair under all its flight numbers, including this one, and those ran 75.0% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 4 points.

B6 1004 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1004thin sample	255	69.0%	104 min	4.71%	C−
All JetBlue Airways on SJU–JFK	2,237	75.0%	78 min	3.22%	B−
All carriers on SJU–JFK	3,657	79.3%	77 min	2.68%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 1004 quarter by quarter

B6 1004 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.5% on time and its weakest Jan–Mar 2026 at 55.4%, a swing of 27 points on roughly 64 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 202564 flights67.7%
Oct–Dec 202562 flights72.4%
Jan–Mar 202670 flights55.4%
Apr–Jun 202659 flights82.5%

Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1004 did best on Wednesday at 77.1% on time and worst on Sunday at 51.5%. Each day rests on about 36 flights, so a gap of 26 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1004 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 7,774 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
53%
Carrier
39%
National Airspace System
7%
Extreme weather
1%

53% 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 7,774 reported delay minutes here, that single category outweighs weather by 53 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 7,774 delay minutes reported on B6 1004.

Cancellations run at 4.71%, 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. 15.3% 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.

At 1,598 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 255 flights under B6 1004 in the data flew SJU 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. 255 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 1004

For a booking, the cancellation rate is the figure to plan around on B6 1004: 4.71% of its 255 scheduled flights did not operate. A late arrival costs close to two hours, 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