Route Reliability
Jacksonville → San Juan
JAX–SJU · 1,288 miles · Jacksonville International Airport to Luis Muñoz Marín International Airport
- 80%
- Arrive within 15 minutes
- 15 min
- Average arrival delay
- 3.8%
- Cancelled
- 182
- Flights in the data
Data through May 2026.
Airlines on this route
- Frontier Airlines82% on time · 125 flights
- JetBlue Airways75% on time · 57 flights
Too little history on this route to call a winner. We rank airlines only after 100 flights each.
What the data says
Morning flights do better here.
JAX–SJU flights departing between 9 AM–12 PM arrived on time 93% of the time, versus 67% between 9 PM–12 AM.
Saturdays have been rough.
JAX–SJU flights arrived on time 91% of the time on Fridays and just 69% on Saturdays. That gap is worth planning around.
Keep a backup plan handy.
This route was cancelled 3.8% of the time. Typical for U.S. flights is around 1–2%.
Trending in the right direction.
JAX–SJU flights arrived on time 77% of the time over the last three months in the data, compared with 67% in the three months before that.
Flights on this route
The breakdown
- Mon79%(28 flights)
- Tue—(9 flights)
- Wed81%(16 flights)
- Thu82%(28 flights)
- Fri91%(34 flights)
- Sat69%(29 flights)
- Sun81%(31 flights)
- 9 AM–12 PM93%(73 flights)
- 12–3 PM—(4 flights)
- 3–6 PM72%(43 flights)
- 6–9 PM71%(31 flights)
- 9 PM–12 AM67%(24 flights)
Jun 91% → May 89% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 91% | 21 |
| July 2025 | 95% | 20 |
| August 2025 | 75% | 12 |
| December 2025 | 65% | 20 |
| January 2026 | 60% | 10 |
| March 2026 | 70% | 10 |
| April 2026 | 73% | 22 |
| May 2026 | 89% | 52 |
Keep nerding
Based on 182 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.