San Juan (SJU) to Jacksonville (JAX): On-Time Performance
Data through July 2026
San Juan (SJU) to Jacksonville (JAX) is a thinner route than most in this dataset — 261 departures over the past year, roughly 5 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 76% arrived on time.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 25 min
- completed flights
- Cancelled
- 2.7%
- Flights/day
- 0.72
- last 12 months
- Duration
- 3h 27m
- scheduled
- Distance
- 1,288 mi
Best airline from SJU to JAX
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 80% | 16 min | 1.7% | 117 |
| Frontier Airlines | 75% | 28 min | 3.1% | 321 |
Monthly on-time trend
Best time to fly from SJU to JAX
Aim for departures around 7 a.m. (91% on-time); avoid 5 p.m. departures (50%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 67% | 64 min |
| Tuesday | 60% | 22 min |
| Wednesdaybest | 83% | 17 min |
| Thursday | 83% | 11 min |
| Friday | 80% | 11 min |
| Saturday | 71% | 28 min |
| Sunday | 83% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft54%
- Airline operations34%
- National airspace system5%
- Weather8%
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 2024-07 and 2026-07. The average arrival delay across completed flights was 25 minutes.
- Which airline is most reliable from SJU to JAX?
- JetBlue Airways has the best on-time record on this route at 80%, based on 117 flights. 2 airlines flew SJU–JAX frequently enough to compare in this period.
- What is the best time of day to fly from SJU to JAX?
- Departures around 7 a.m. have the best record (91% 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 27m 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?
- 2.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What day of the week is most reliable for SJU to JAX?
- Wednesday flights have the best record at 83% on-time. Day-of-week differences on this route are meaningful — Tuesday trails at 60%.
Explore related pages
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Based on 438 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.