Route profile
FLL→SJU
Flight reliability, delays and best times to fly from Fort Lauderdale to San Juan, 1,046 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 24% of comparable major US routes (4,598 compared)
Calculated from 7,202 flights. How this is calculated
FLL → SJU arrives on time 70.5% of the time; the return trip, SJU → FLL, arrives on time 74.5% of the time, a 4.0-point gap between the two directions of the same city pair.
FLL → SJU spends 22.4 minutes on the ground on a 1,046-mile trip: 16.7 minutes from pushback to wheels-up at FLL and 5.7 minutes from touchdown to gate at SJU.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
On-time performance swings unusually widely by time of day here, wider than 100% of 4,023 comparable routes.
90.3% on time for 5–9 AM departures, against 48.5% for 9 PM–5 AM.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,023 in the comparison.
What sets this route apart
Where FLL to SJU differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
FLL to SJU struggles most at 9 PM: 44.5% of its flights scheduled then arrive on time, 20.8 points behind the 65.3% on routes of similar length at the same hour. Against all other routes the gap is 25 points.
FLL to SJU is at its best against routes of similar length for flights scheduled at 7 AM: 93.1% arrive on time, 5.2 points ahead of the 87.9% those routes manage at that hour. Against all other routes the gap is 5.3 points.
Saturday is the day FLL to SJU slips furthest against routes of similar length, 67.9% on time where they average 77.0%, 9.1 points lower. Against all other routes the gap is 11.2 points.
In December, FLL to SJU runs 11.9 points below routes of similar length, 65.1% on time to 77.0%. Against all other routes the gap is 13.7 points.
Spirit Airlines’ flights on FLL to SJU arrive on time 66.1% of the time, 7.6 points below the 73.7% it manages on its routes of similar length. Against all other routes the gap is 9.2 points.
FLL to SJU against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 9 PM departures | 44.5% | routes of similar length | 65.3% | −20.8 pts | 211 here, 77,417 there |
| Hour: 7 AM departures | 93.1% | routes of similar length | 87.9% | +5.2 pts | 419 here, 232,017 there |
| Weekday: Saturday | 67.9% | routes of similar length | 77.0% | −9.1 pts | 1,019 here, 379,680 there |
| Month: December | 65.1% | routes of similar length | 77.0% | −11.9 pts | 656 here, 238,858 there |
| Airline: Spirit Airlines | 66.1% | routes of similar length | 73.7% | −7.6 pts | 1,209 here, 180,052 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 1,046 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
Why FLL → SJU flights are cancelled
July 2023 – July 2026
FLL → SJU cancelled 67 of 7,202 scheduled flights — about 1 in every 107. The reason filed most often was the air traffic system, 41.8% of the cancellations coded on this route — about 1 in every 257 scheduled flights.
Share of cancellations
Of 67 cancelled departures carrying a reason code.
What each reason means
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
28 cancellations, 41.8% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
23 cancellations, 34.3% of the total.
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
16 cancellations, 23.9% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
67 coded cancellations were recorded on FLL → SJU; the section appears from 50.
When it goes wrong
July 2023 – July 2026
56 min late
against a median of 1 min early
Percentiles over 7,202 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at SJU after arriving from FLL.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 47% | Likely to miss |
| 45 min | 28% | High risk |
| 60 min | 19% | High risk |
| 90 min | 9.1% | Some risk |
| 120 min | 5.2% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 0.93% of the time and diverts 0.07% of the time, which a late arrival never shows up in.
Chance of missing is the share of 7,130 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 56 minutes late (90th-percentile gate arrival delay), over 7,202 operations.
Any other layover length: connection checker.
Best time to fly
FLL → SJU flights departing 5–9 AM arrived on time 90.3% of the time, against 48.5% for 9 PM–5 AM departures, a gap of 41.8 percentage points.
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 91.8% on time from 184 flights
- 6 AM: 91.5% on time from 430 flights
- 7 AM: 93.1% on time from 422 flights
- 8 AM: 82.4% on time from 254 flights
- 9 AM: 78.2% on time from 535 flights
- 10 AM: 69.3% on time from 552 flights
- 11 AM: 66.1% on time from 625 flights
- 12 PM: 67.4% on time from 488 flights
- 1 PM: 72.5% on time from 411 flights
- 2 PM: 63.0% on time from 475 flights
- 3 PM: 68.0% on time from 341 flights
- 4 PM: 69.4% on time from 485 flights
- 5 PM: 63.5% on time from 687 flights
- 6 PM: 64.4% on time from 494 flights
- 7 PM: 57.7% on time from 302 flights
- 8 PM: 58.4% on time from 249 flights
- 9 PM: 44.5% on time from 215 flights
- 10 PM to 11 PM: too few flights to score
Why FLL → SJU runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for FLL → SJU. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on FLL → SJU, at 43.1%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 90.3% of the time and 9 PM–5 AM departures 48.5%.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| JetBlue | 4,522 | 72.7% | 0.77% | -3 min | 8.7% |
| Spirit Airlines | 1,223 | 66.1% | 0.98% | 1 min | 10.8% |
| Southwest Airlines | 1,153 | 69.6% | 0.52% | 2 min | 8.6% |
| Frontier Airlines | 304 | 59.3% | 4.61% | 8 min | 13.4% |
JetBlue flew 62.8% of the 7,202 flights listed. Frontier Airlines cancelled 4.61% of its flights here against 0.52% for Southwest Airlines.
JetBlue arrived on time 13.4 percentage points more often than Frontier Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 13.5 percentage points.
By month
- Jan: 68.4%
- Feb: 71.7%
- Mar: 64.6%
- Apr: 77.2%
- May: 76.2%
- Jun: 72.4%
- Jul: 65.4%
- Aug: 63.8%
- Sep: 73.8%
- Oct: 78.1%
- Nov: 76.2%
- Dec: 65.1%
August is historically the weakest month and October the strongest, a spread of 14.3 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 54.0% from 217 flights
- August 2023: 62.5% from 200 flights
- September 2023: 68.9% from 180 flights
- October 2023: 72.1% from 140 flights
- November 2023: 69.4% from 157 flights
- December 2023: 71.0% from 176 flights
- January 2024: 71.3% from 174 flights
- February 2024: 78.5% from 145 flights
- March 2024: 69.1% from 163 flights
- April 2024: 83.2% from 179 flights
- May 2024: 73.8% from 221 flights
- June 2024: 68.7% from 255 flights
- July 2024: 71.6% from 261 flights
- August 2024: 58.8% from 208 flights
- September 2024: 73.8% from 164 flights
- October 2024: 79.8% from 199 flights
- November 2024: 81.6% from 217 flights
- December 2024: 69.8% from 223 flights
- January 2025: 72.9% from 205 flights
- February 2025: 77.8% from 177 flights
- March 2025: 74.9% from 243 flights
- April 2025: 78.0% from 160 flights
- May 2025: 83.2% from 184 flights
- June 2025: 75.1% from 193 flights
- July 2025: 74.7% from 223 flights
- August 2025: 70.3% from 195 flights
- September 2025: 81.0% from 121 flights
- October 2025: 81.6% from 147 flights
- November 2025: 75.8% from 226 flights
- December 2025: 57.0% from 261 flights
- January 2026: 61.6% from 216 flights
- February 2026: 59.6% from 171 flights
- March 2026: 50.6% from 237 flights
- April 2026: 70.4% from 181 flights
- May 2026: 71.8% from 174 flights
- June 2026: 74.3% from 192 flights
- July 2026: 59.6% from 217 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 66.5% against 74.8% in the 12 months before — declining by 8.3 percentage points.
Data and methodology
Calculated by FlyerIntel from 7,202 FLL → SJU flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed