Flight number record
B6 803
JetBlue Airways · New York to San Juan
- Route
- JFK → SJU
- Departs
- 21:29
- Flights
- 289
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 803, check with JetBlue Airways.
B6 803 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 289 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so B6 803 runs 15 points behind the country as a whole. Across a thousand flights that is about 151 extra late arrivals.
Key figures
On time
62.2%
Arrivals under 15 minutes late, of 275 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
4.50%
National rate is 1.89%
1 hour+ late
18.2%
National rate is 8.3%
These figures cover 289 flights between September 2025 and August 2026. Beyond the headline rate, 18.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 803 flies
B6 803 flies JFK to SJU without a single fixed slot. Its most common scheduled departure was 21:29, used on 33 of 289 flights, with 12:45 (31 flights) next.
- Departs 21:2933 flights11.4%
- Departs 12:4531 flights10.7%
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 21:29 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and B6 803 runs 8 points worse at 62.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
B6 803 next to JFK to SJU
Every carrier on JFK to SJU combined arrived on time 70.2% of the time across 3,554 flights, so B6 803 is 8 points behind it. JetBlue flew 2,245 flights on the same city pair under all its flight numbers, including this one, and those ran 67.7% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 803thin sample | 289 | 62.2% | 84 min | 4.50% | D− |
| All JetBlue Airways on JFK–SJU | 2,245 | 67.7% | 78 min | 4.14% | C− |
| All carriers on JFK–SJU | 3,554 | 70.2% | 78 min | 3.57% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | 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 Jul–Sep 2026 at 35.7%, a swing of 40 points on roughly 58 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 202530 flights73.3%
- Oct–Dec 202549 flights76.1%
- Jan–Mar 202673 flights58.0%
- Apr–Jun 202675 flights73.0%
- Jul–Sep 202662 flights35.7%
Scale runs 25% to 80%.
By weekday, B6 803 did best on Tuesday at 73.7% on time and worst on Friday at 56.4%. Each day rests on about 41 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 803 runs when it is late
B6 803 often beats the schedule: 88 of 275 completed flights, 32%, arrived 15 minutes or more early. The 104 late arrivals split 23 under half an hour, 31 between 30 and 60 minutes, and 50 an hour or more.
- 15+ min early88 flights32.0%
- Within 15 min83 flights30.2%
- 15–29 min late23 flights8.4%
- 30–59 min late31 flights11.3%
- 1–2 hours late29 flights10.5%
- 2+ hours late21 flights7.6%
Scale runs 0% to 100%.
Share of 275 completed flights by arrival against schedule.
21 of 106 late departures made up the time and arrived on time, 20% of them. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SJU.
The worst days
Worst days for B6 803
The latest arrival of the period was on 17 March 2026, 11 hours 12 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 March 2026 | 11 hours 12 minutes | Late-arriving aircraft |
| 27 July 2026 | 6 hours 32 minutes | Late-arriving aircraft |
| 7 February 2026 | 5 hours 37 minutes | Carrier |
| 18 March 2026 | 5 hours 22 minutes | Late-arriving aircraft |
| 21 July 2026 | 5 hours 14 minutes | Extreme weather |
Delay causes
Why B6 803 runs late
Late-arriving aircraft accounts for 47% of the 8,767 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Late-arriving aircraft
- 30%Carrier
- 20%National Airspace System
- 3%Extreme weather
- 0%Security
47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,767 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 8,767 delay minutes reported on B6 803.
Cancellations run at 4.50%, against 1.89% nationally. That is roughly 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
18.2% 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.
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, the cancellation rate is the figure to plan around on B6 803: 4.50% of its 289 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JFK to SJU, every carrier and departure
- SJU to JFK, the return direction
- Delta Air Lines 1961 on the same route83.6%
- Delta Air Lines 1859 on the same route67.4%
- JetBlue Airways 503 on the same route72.1%
- Delta Air Lines 1966 on the same route80.5%
- JetBlue Airways 1603 on the same route75.6%
- John F. Kennedy International (JFK) delay statistics
- Luis Munoz Marin International (SJU) 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.