Carrier route record
B6MCO→SJU
JetBlue Airways · Orlando to San Juan
- Flights
- 2,134
- Period
- July 2025 to June 2026
- Share of route
- 35%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on MCO to SJU lands a B+, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 2,134 flights. The strongest carrier on the route with a full sample, Frontier Airlines, flew 1,242 at 73.6% on time.
The US average over the same twelve months is 77.6%, so there is little to separate JetBlue on MCO to SJU from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.4%
Arrivals under 15 minutes late, of 2,112 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.98%
National rate is 1.81%
Whole route
73.0%
Every carrier on MCO to SJU, 6,054 flights
These figures cover 2,134 flights between July 2025 and June 2026. Beyond the headline rate, 8.7% 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.
Carrier by carrier
JetBlue against every carrier on MCO to SJU
JetBlue flew 2,134 of the 6,054 flights on MCO to SJU, about 35% of it. Its 76.4% on time is 3 points better than the route as a whole, which runs 73.0%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from JetBlue at 76.4% to Southwest at 69.8%.
The three carriers here are closely matched: 4 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways (this page) | 2,134 | 76.4% | 70 min | 0.98% | B+ |
| Frontier Airlines | 1,242 | 73.6% | 80 min | 1.37% | C |
| Spirit Airlines | 611 | 70.9% | 60 min | 0.98% | C+ |
| Southwest Airlines | 2,067 | 69.8% | 51 min | 0.63% | C+ |
No carrier stands out. Frontier tops the table at 73.6%, 4 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
JetBlue flight numbers on MCO to SJU
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 37 points, against 4 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am483 flights93.9%
- 8am–11am380 flights85.9%
- 11am–2pm355 flights72.2%
- 2pm–5pm267 flights71.3%
- 5pm–8pm404 flights65.4%
- 8pm–5am245 flights56.8%
Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 56.8% on time, against 93.9% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 483 flights scheduled in it.
Across the year
JetBlue on MCO to SJU through the year
January is the weak month at 65.6% on time, against 87.2% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. June was the busiest month here, with 232 flights.
Across the week, Tuesday is the strongest day at 84.0% on time and Sunday the weakest at 69.9%. 14 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 35,000 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.
- 49%Late-arriving aircraft
- 35%Carrier
- 11%National Airspace System
- 5%Extreme weather
49% 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 35,000 reported delay minutes here, that single category outweighs weather by 11 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 34,853 reported delay minutes.
The largest share of delay minutes, 35%, 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 12,000 of the 35,000 delay minutes reported here.
Cancellations sit at 0.98% against a national 1.81%, which is ordinary. Diversions add another 0.05%.
Connections and stage length
What a delay here costs
8.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
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.
The return leg runs 76.9% on time across 2,130 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 2,134 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking JetBlue on MCO to SJU
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 87.2% on time and January 65.6%, a swing of 22 points. If the dates move at all, move them out of January before you think about anything else. 2,112 completed flights over 12 months sit behind that.
Related
Where to go next
- MCO to SJU, every carrier
- JetBlue on SJU to MCO, the return leg
- Frontier Airlines on MCO to SJU73.6%
- Spirit Airlines on MCO to SJU70.9%
- Southwest Airlines on MCO to SJU69.8%
- JetBlue Airways network-wide record
- Orlando International (MCO) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.