Route reliability record
FLL→SJU
Fort Lauderdale to San Juan
- Flights
- 2,358
- Period
- September 2025 to August 2026
- Distance
- 1,046 mi
- Carriers
- 4
This route draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 2,358 FLL to SJU flights, with a median arrival 1 minute late.
Best time to fly FLL to SJU: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 92.4% of the time and Tuesday flights 76.2%, against 66.8% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
66.8%
Arrivals under 15 minutes late, of 2,319 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.57%
National rate is 1.89%
Best carrier
JetBlue
69.3% on time across 1,718 flights
These figures cover 2,358 flights between September 2025 and August 2026. Beyond the headline rate, 10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on FLL to SJU
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 | 1,718 | 69.3% | 60 min | 1.57% | C |
| Southwest Airlinesthin sample | 225 | 65.2% | 41 min | 0.44% | C+ |
| Frontier Airlinesthin sample | 173 | 64.5% | 106 min | 2.31% | D |
| Spirit Airlinesthin sample | 242 | 52.1% | 69 min | 2.07% | F |
Flight by flight
Flights on FLL to SJU
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Fort Lauderdale to San Juan
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 3 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. MIA → SJUMiami to San Juan | American Airlines | 77.8% | 78.2% | 0.51% | 5am–8am, Wed | — |
| 2. MIA → SJUMiami to San Juan | Frontier Airlines | 70.9% | 71.8% | 1.31% | 8am–11am, Wed | — |
| 3. FLL → SJUFort Lauderdale to San Juan | JetBlue Airways | 68.2% | 69.3% | 1.57% | 5am–8am, Tue | B6 553 17:45 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 45 points, against half a point between the best and worst carrier.
- 5am–8am364 flights92.4%
- 8am–11am311 flights74.3%
- 11am–2pm658 flights59.2%
- 2pm–5pm380 flights62.3%
- 5pm–8pm425 flights65.2%
- 8pm–5am220 flights47.9%
Scale runs 40% to 100%.
The 8pm–5am window is where this operation falls apart: 47.9% on time, against 92.4% 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 658 flights scheduled in it.
Explore
Filter FLL to SJU by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On FLL to SJU, the best departure window is 5am–8am at 92.4% on time and the worst is 8pm–5am at 47.9%, a wide gap of 44.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am92.4%
- 8–11am74.3%
- 11am–2pm59.2%
- 2–5pm62.3%
- 5–8pm65.2%
- 8pm–5am47.9%
best all US flightsScale 40% to 95%.
Across the year
When delays peak on this route
This route's year swings by 31 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
October is the best month on the calendar at 81.6% 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 261 flights.
Across the week, Tuesday is the strongest day at 76.2% on time and Sunday the weakest at 58.9%, a spread of 17 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 46% of the 49,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 38%Carrier
- 13%National Airspace System
- 3%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. Across 49,000 reported delay minutes here, that single category outweighs weather by 15 to one. The split is drawn from 48,639 reported delay minutes.
The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 19,000 of the 49,000 delay minutes reported here.
Cancellations sit at 1.57% against a national 1.89%, which is ordinary. Diversions add another 0.08%.
Connections and stage length
What a delay here actually costs
10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The return leg is a different operation and performs like one: it runs 76.2% on time across 2,356 flights, 9 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 9 points of difference.
The sample behind these figures is 2,358 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.
Work out the risk of missing a connection in SJU after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. October runs 81.6% on time and March 50.6%, a swing of 31 points. If the dates move at all, move them out of March before you think about anything else. 2,319 completed flights over 12 months sit behind that.
Common questions
FLL to SJU questions
How often is FLL to SJU delayed?
About one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 33.2% of the 2,358 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is FLL to SJU compared with the rest of the country?
66.8% of flights arrive on time here against a national 77.3%, a difference of 11 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on FLL to SJU?
The 5am–8am departure window is the strongest at 92.4% on time. The 8pm–5am window is the weakest at 47.9%, 45 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on FLL to SJU?
March is the weakest month at 50.6% on time, compared with 81.6% in October. Across the year that is 31 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- SJU to FLL — the return legseparate record
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- JetBlue Airways on FLL to SJU69.3%
- Southwest Airlines on FLL to SJU65.2%
- Frontier Airlines on FLL to SJU64.5%
- Spirit Airlines on FLL to SJU52.1%
- FLL to ATL, a related route71.0%
- MCO to SJU, a related route73.8%
- FLL to LGA, a related route64.8%
- JetBlue Airways on-time record69.3%
- Southwest Airlines on-time record65.2%
- Frontier Airlines on-time record64.5%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. FLL to SJU and SJU to FLL are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.