Flight number record

B6 1233

JetBlue Airways · Orlando to San Juan

Route: MCO → SJU
Departs: 05:01
Flights: 341
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs about an hour. That rests on 341 flights, with a median arrival 7 minutes early.

Set against the rest of the country, B6 1233's record is 14 points better than the US average of 77.6%. That gap is worth roughly 141 fewer late arrivals for every thousand flights.

On time

91.7%

Arrivals under 15 minutes late, of 337 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

1.17%

National rate is 1.81%

1 hour+ late

2.1%

National rate is 8.1%

These figures cover 341 flights between July 2025 and June 2026. The median arrival is 7 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.

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 162 of 341 flights, with 06:00 (69 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:01162 flights47.5%
Departs 06:0069 flights20.2%

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 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 91.7%. 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 1233 next to MCO to SJU

Every carrier on MCO to SJU combined arrived on time 73.0% of the time across 6,054 flights, so B6 1233 is 19 points ahead of it. JetBlue flew 2,134 flights on the same city pair under all its flight numbers, including this one, and those ran 76.4% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 19 points.

B6 1233 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1233thin sample	341	91.7%	59 min	1.17%	A
All JetBlue Airways on MCO–SJU	2,134	76.4%	70 min	0.98%	B+
All carriers on MCO–SJU	6,054	73.0%	63 min	0.94%	C+
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 1233 quarter by quarter

Quarter by quarter B6 1233 held fairly steady: 90.7% in Jul–Sep 2025, 91.1% in Oct–Dec 2025, 92.0% in Jan–Mar 2026 and 93.2% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202586 flights90.7%
Oct–Dec 202591 flights91.1%
Jan–Mar 202690 flights92.0%
Apr–Jun 202674 flights93.2%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1233 ranged from 85.7% on Sunday to 95.9% on Friday. With about 49 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why B6 1233 runs late

One category carries most of the weight here. Carrier accounts for 86% of the 1,641 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.

Carrier
86%
National Airspace System
11%
Late-arriving aircraft
3%

The largest share of delay minutes, 86%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,403 of the 1,641 delay minutes reported here. The split is drawn from 1,641 delay minutes reported on B6 1233.

Cancellations sit at 1.17% against a national 1.81%, 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 2.1% land an hour or more behind schedule, against 8.1% 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. 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 341 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. 341 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, B6 1233 has one of the better records a US domestic flight can show: 91.7% on time and 1.17% cancelled. That is a base rate, not a promise about any single 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