Flight number record
B6 1233
JetBlue Airways · Orlando to San Juan
- Route
- MCO → SJU
- Departs
- 05:01
- Flights
- 319
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 1233, check with JetBlue Airways.
B6 1233 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 319 flights, with a median arrival 6 minutes early.
Set against the rest of the country, B6 1233's record is 14 points better than the US average of 77.3%. That gap is worth roughly 141 fewer late arrivals for every thousand flights.
Key figures
On time
91.4%
Arrivals under 15 minutes late, of 313 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.88%
National rate is 1.89%
1 hour+ late
2.6%
National rate is 8.3%
These figures cover 319 flights between September 2025 and August 2026. The median arrival is 6 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When B6 1233 flies
B6 1233 flies MCO to SJU without a single fixed slot. Its most common scheduled departure was 05:01, used on 139 of 319 flights, with 06:00 (69 flights) next.
- Departs 05:01139 flights43.6%
- Departs 06:0069 flights21.6%
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 05:01 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and B6 1233 runs 2 points better at 91.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
B6 1233 next to MCO to SJU
Every carrier on MCO to SJU combined arrived on time 73.8% of the time across 6,141 flights, so B6 1233 is 18 points ahead of it. JetBlue flew 2,196 flights on the same city pair under all its flight numbers, including this one, and those ran 75.5% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 1233thin sample | 319 | 91.4% | 64 min | 1.88% | A |
| All JetBlue Airways on MCO–SJU | 2,196 | 75.5% | 69 min | 1.50% | B |
| All carriers on MCO–SJU | 6,141 | 73.8% | 63 min | 1.14% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 1233 quarter by quarter
B6 1233 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.8% on time and its weakest Jul–Sep 2025 at 83.3%, a swing of 11 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 202530 flights83.3%
- Oct–Dec 202591 flights91.1%
- Jan–Mar 202690 flights92.0%
- Apr–Jun 202674 flights93.2%
- Jul–Sep 202634 flights93.8%
Scale runs 75% to 100%.
By weekday, B6 1233 ranged from 85.0% on Sunday to 95.8% on Wednesday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late B6 1233 runs when it is late
The 27 late arrivals split 9 under half an hour, 10 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early52 flights16.6%
- Within 15 min234 flights74.8%
- 15–29 min late9 flights2.9%
- 30–59 min late10 flights3.2%
- 1–2 hours late5 flights1.6%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 313 completed flights by arrival against schedule.
5 of 26 late departures made up the time and arrived on time, 19% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for B6 1233
The latest arrival of the period was on 10 November 2025, 7 hours 9 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 November 2025 | 7 hours 9 minutes | Carrier |
| 19 September 2025 | 2 hours 9 minutes | Carrier |
| 21 July 2026 | 2 hours 6 minutes | Carrier |
| 5 January 2026 | 1 hour 50 minutes | Carrier |
| 27 November 2025 | 1 hour 41 minutes | Carrier |
Delay causes
Why B6 1233 runs late
Carrier accounts for 86% of the 1,729 delay minutes carriers reported here, and the remaining four split what is left.
- 86%Carrier
- 11%National Airspace System
- 3%Late-arriving aircraft
The largest share of delay minutes, 86%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,484 of the 1,729 delay minutes reported here. The split is drawn from 1,729 delay minutes reported on B6 1233.
Cancellations sit at 1.88% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,188 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.
Every one of the 319 flights under B6 1233 in the data flew MCO 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. 319 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 1233
For a booking, read B6 1233 as 91.4% on time with 1.88% cancelled over 319 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MCO to SJU, every carrier and departure
- SJU to MCO, the return direction
- Frontier Airlines 4726 on the same route78.2%
- JetBlue Airways 2133 on the same route75.8%
- JetBlue Airways 1033 on the same route69.7%
- Frontier Airlines 1824 on the same route78.3%
- Frontier Airlines 2250 on the same route85.7%
- Orlando International (MCO) 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
- Worst months to fly in the US, ranked by the data
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.