San Juan (SJU) to Jacksonville (JAX): On-Time Performance
Data through May 2026
San Juan (SJU) to Jacksonville (JAX) is a thinner route than most in this dataset — 182 departures over the past year, roughly 4 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 76% arrived on time. Cancellations are the bigger caveat: 3.8% of scheduled flights never departed.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 25 min
- completed flights
- Cancelled
- 3.8%
- Flights/day
- 0.50
- last 12 months
- Duration
- 3h 30m
- scheduled
- Distance
- 1,288 mi
Monthly on-time trend
Best time to fly from SJU to JAX
Aim for departures around 7 a.m. (94% on-time); avoid 5 p.m. departures (50%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 59 min |
| Tuesday | 58% | 26 min |
| Wednesday | 80% | 20 min |
| Thursday | 83% | 13 min |
| Friday | 79% | 11 min |
| Saturday | 65% | 35 min |
| Sundaybest | 85% | 13 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft49%
- Airline operations37%
- National airspace system4%
- Weather10%
Frequently asked questions
- How often are flights from SJU to JAX delayed?
- 24% of SJU–JAX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 25 minutes.
- What is the best time of day to fly from SJU to JAX?
- Departures around 7 a.m. have the best record (94% on-time), while departures around 5 p.m. have the worst (50%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to JAX?
- The scheduled SJU–JAX flight time averages 3h 30m over 1,288 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are SJU to JAX flights cancelled?
- 3.8% of scheduled flights on this route were cancelled between 2024-06 and 2026-05 — several times the typical US rate, so consider earlier departures or backup options.
- What day of the week is most reliable for SJU to JAX?
- Sunday flights have the best record at 85% on-time. Day-of-week differences on this route are meaningful — Saturday trails at 65%.
Explore related pages
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Based on 346 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.