Jacksonville (JAX) to San Juan (SJU): On-Time Performance
Data through July 2026
Jacksonville (JAX) to San Juan (SJU) 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, 72% arrived on time, noticeably below the national average of 78%. Cancellations are the bigger caveat: 3.7% of scheduled flights never departed.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 32 min
- completed flights
- Cancelled
- 3.7%
- Flights/day
- 0.72
- last 12 months
- Duration
- 3h 4m
- scheduled
- Distance
- 1,288 mi
Best airline from JAX to SJU
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlinesmost reliable | 72% | 36 min | 4.4% | 321 |
| JetBlue Airways | 70% | 23 min | 1.7% | 117 |
Monthly on-time trend
Best time to fly from JAX to SJU
Aim for departures around 11 a.m. (87% on-time); avoid 8 p.m. departures (49%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 66% | 64 min |
| Tuesday | 63% | 25 min |
| Wednesdaybest | 77% | 24 min |
| Thursday | 75% | 29 min |
| Friday | 77% | 11 min |
| Saturday | 68% | 56 min |
| Sunday | 74% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft69%
- Airline operations28%
- National airspace system3%
- Weather1%
Frequently asked questions
- How often are flights from JAX to SJU delayed?
- 28% of JAX–SJU 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 32 minutes.
- Which airline is most reliable from JAX to SJU?
- Frontier Airlines has the best on-time record on this route at 72%, based on 321 flights. 2 airlines flew JAX–SJU frequently enough to compare in this period.
- What is the best time of day to fly from JAX to SJU?
- Departures around 11 a.m. have the best record (87% on-time), while departures around 8 p.m. have the worst (49%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from JAX to SJU?
- The scheduled JAX–SJU flight time averages 3h 4m over 1,288 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are JAX to SJU flights cancelled?
- 3.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07 — several times the typical US rate, so consider earlier departures or backup options.
- What day of the week is most reliable for JAX to SJU?
- Wednesday flights have the best record at 77% on-time. Day-of-week differences on this route are meaningful — Tuesday trails at 63%.
Explore related pages
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Other ways to fly to San Juan (SJU)
Related guides
Based on 438 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.