Flight number record

B6 803

JetBlue Airways · New York to San Juan

Route: JFK → SJU
Departs: 15:59
Flights: 289
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 803, check with JetBlue Airways.

B6 803 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 10 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 289 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.6%, so B6 803 runs 10 points behind the country as a whole. Across a thousand flights that is about 96 extra late arrivals.

On time

68.0%

Arrivals under 15 minutes late, of 281 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

2.42%

National rate is 1.81%

1 hour+ late

13.2%

National rate is 8.1%

These figures cover 289 flights between July 2025 and June 2026. Beyond the headline rate, 13.2% 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 803 flies

B6 803 flies JFK to SJU without a single fixed slot. Its most common scheduled departure was 15:59, used on 39 of 289 flights, with 21:29 (33 flights) and 12:45 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:5939 flights13.5%
Departs 21:2933 flights11.4%
Departs 12:4531 flights10.7%

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 15:59 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and B6 803 runs 4 points worse at 68.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 803 next to JFK to SJU

Every carrier on JFK to SJU combined arrived on time 71.1% of the time across 3,651 flights, so B6 803 is 3 points behind it. JetBlue flew 2,232 flights on the same city pair under all its flight numbers, including this one, and those ran 69.5% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 5 points.

B6 803 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 803thin sample	289	68.0%	75 min	2.42%	C
All JetBlue Airways on JFK–SJU	2,232	69.5%	74 min	2.91%	C
All carriers on JFK–SJU	3,651	71.1%	74 min	2.63%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 803 quarter by quarter

B6 803 did not run the same all year. Its best quarter was Oct–Dec 2025 at 76.1% on time and its weakest Jan–Mar 2026 at 58.0%, a swing of 18 points on roughly 72 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 202592 flights67.4%
Oct–Dec 202549 flights76.1%
Jan–Mar 202673 flights58.0%
Apr–Jun 202675 flights73.0%

Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, B6 803 ranged from 63.2% on Wednesday to 75.0% on Tuesday. With about 41 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why B6 803 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 6,766 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
26%
National Airspace System
19%
Extreme weather
1%
Security
0%

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 6,766 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 6,766 delay minutes reported on B6 803.

Cancellations sit at 2.42% against a national 1.81%, which is ordinary. Diversions add another 0.35%.

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. 13.2% 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 289 flights under B6 803 in the data flew JFK to SJU. 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. 289 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 803

For a booking, B6 803 is a flight to put a long connection behind. 13.2% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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