Carrier route record
B6FLL→SJU
JetBlue Airways · Fort Lauderdale to San Juan
- Flights
- 1,646
- 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 FLL to SJU sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 1,646 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so JetBlue on FLL to SJU runs 7 points behind the country as a whole. Across a thousand flights that is about 66 extra late arrivals.
Key figures
On time
71.0%
Arrivals under 15 minutes late, of 1,625 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.22%
National rate is 1.81%
Whole route
68.0%
Every carrier on FLL to SJU, 2,344 flights
These figures cover 1,646 flights between July 2025 and June 2026. Beyond the headline rate, 9.0% 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 FLL to SJU
JetBlue flew 1,646 of the 2,344 flights on FLL to SJU, most of the route. Its 71.0% on time is 3 points better than the route as a whole, which runs 68.0%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from JetBlue at 71.0% to Spirit at 55.4%. 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 |
|---|---|---|---|---|---|
| JetBlue Airways (this page) | 1,646 | 71.0% | 58 min | 1.22% | C |
| Southwest Airlinesthin sample | 279 | 64.7% | 48 min | 0.36% | D+ |
| Frontier Airlinesthin sample | 128 | 64.2% | 110 min | 3.91% | D− |
| Spirit Airlinesthin sample | 291 | 55.4% | 68 min | 1.72% | D |
Flight by flight
JetBlue flight numbers on FLL 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 42 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–8am349 flights93.3%
- 8am–11am114 flights86.7%
- 11am–2pm385 flights59.3%
- 2pm–5pm280 flights68.5%
- 5pm–8pm334 flights68.7%
- 8pm–5am184 flights51.6%
Scale runs 45% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 51.6% on time, against 93.3% 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 11am–2pm window is the busiest, with 385 flights scheduled in it.
Across the year
JetBlue on FLL to SJU through the year
September is the best month on the calendar at 85.4% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. December was the busiest month here, with 175 flights.
Across the week, Wednesday is the strongest day at 82.9% on time and Sunday the weakest at 61.9%. 21 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 46% 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.
- 46%Late-arriving aircraft
- 37%Carrier
- 13%National Airspace System
- 5%Extreme weather
- 0%Security
46% 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 10 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 27,452 reported delay minutes.
The largest share of delay minutes, 37%, 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 10,000 of the 27,000 delay minutes reported here.
Cancellations sit at 1.22% against a national 1.81%, which is ordinary. Diversions add another 0.06%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
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 76.6% on time across 1,645 flights, 6 points above 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 1,646 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 FLL to SJU
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 85.4% on time and March 58.4%, a swing of 27 points. If the dates move at all, move them out of March before you think about anything else. 1,625 completed flights over 12 months sit behind that.
Related
Where to go next
- FLL to SJU, every carrier
- JetBlue on SJU to FLL, the return leg
- Southwest Airlines on FLL to SJU64.7%
- Frontier Airlines on FLL to SJU64.2%
- Spirit Airlines on FLL to SJU55.4%
- JetBlue Airways network-wide record
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
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.