Carrier route record
B6SJU→FLL
JetBlue Airways · San Juan to Fort Lauderdale
- Flights
- 1,645
- Period
- July 2025 to June 2026
- Share of route
- 70%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on SJU to FLL 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 1,645 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate JetBlue on SJU to FLL from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.6%
Arrivals under 15 minutes late, of 1,617 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
1.28%
National rate is 1.81%
Whole route
75.1%
Every carrier on SJU to FLL, 2,342 flights
These figures cover 1,645 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 SJU to FLL
JetBlue flew 1,645 of the 2,342 flights on SJU to FLL, most of the route. Its 76.6% on time is 2 points better than the route as a whole, which runs 75.1%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Frontier at 81.6% to Spirit at 61.9%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 128 | 81.6% | 143 min | 2.34% | B |
| JetBlue Airways (this page) | 1,645 | 76.6% | 71 min | 1.28% | B |
| Southwest Airlinesthin sample | 279 | 76.3% | 39 min | 0.36% | B+ |
| Spirit Airlinesthin sample | 290 | 61.9% | 79 min | 2.76% | D |
Flight by flight
JetBlue flight numbers on SJU to FLL
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 29 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am364 flights91.2%
- 8am–11am229 flights80.0%
- 11am–2pm350 flights79.0%
- 2pm–5pm290 flights72.1%
- 5pm–8pm247 flights61.9%
- 8pm–5am165 flights65.2%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 61.9% on time, against 91.2% 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 364 flights scheduled in it.
Across the year
JetBlue on SJU to FLL through the year
August is the worst month at 67.4% on time, 23 points below October, the best at 90.0%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. December was the busiest month here, with 177 flights.
Across the week, Wednesday is the strongest day at 83.5% on time and Monday the weakest at 70.2%. 13 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 56% of the 27,000 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.
- 56%Late-arriving aircraft
- 33%Carrier
- 10%National Airspace System
- 1%Extreme weather
- 0%Security
56% 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 27,000 reported delay minutes here, that single category outweighs weather by 51 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 26,943 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 91.2% on time here.
Cancellations sit at 1.28% against a national 1.81%, which is ordinary. Diversions add another 0.43%.
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 1,046 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 is a different operation and performs like one: it runs 71.0% on time across 1,646 flights, 6 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
The sample behind these figures is 1,645 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 SJU to FLL
Put together: the calendar is the biggest lever here, not the carrier or the hour. October runs 90.0% on time and August 67.4%, a swing of 23 points. If the dates move at all, move them out of August before you think about anything else. 1,617 completed flights over 12 months sit behind that.
Related
Where to go next
- SJU to FLL, every carrier
- JetBlue on FLL to SJU, the return leg
- Frontier Airlines on SJU to FLL81.6%
- Southwest Airlines on SJU to FLL76.3%
- Spirit Airlines on SJU to FLL61.9%
- JetBlue Airways network-wide record
- Luis Munoz Marin International (SJU) delay statistics
- Fort Lauderdale-Hollywood International (FLL) 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.