Jacksonville (JAX) to Miami (MIA): On-Time Performance
Data through July 2026
Jacksonville (JAX) to Miami (MIA) effectively runs on two schedules. In November 2024, 92% of arrivals were on time; in July 2024 that fell to 62% — a 29-point seasonal swing. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 66%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 4.1
- last 12 months
- Duration
- 1h 22m
- scheduled
- Distance
- 335 mi
Best airline from JAX to MIA
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 80% | 13 min | 1.0% | 1,539 |
| American Airlines | 78% | 22 min | 2.0% | 1,990 |
Monthly on-time trend
Best time to fly from JAX to MIA
Aim for departures around 5 a.m. (96% on-time); avoid 5 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 21 min |
| Tuesday | 79% | 16 min |
| Wednesdaybest | 84% | 16 min |
| Thursday | 80% | 17 min |
| Friday | 79% | 16 min |
| Saturday | 78% | 17 min |
| Sunday | 75% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft48%
- Airline operations36%
- National airspace system12%
- Weather4%
Frequently asked questions
- How often are flights from JAX to MIA delayed?
- 21% of JAX–MIA 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 18 minutes.
- Which airline is most reliable from JAX to MIA?
- Envoy Air has the best on-time record on this route at 80%, based on 1,539 flights. 2 airlines flew JAX–MIA frequently enough to compare in this period.
- What is the best time of day to fly from JAX to MIA?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 5 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from JAX to MIA?
- The scheduled JAX–MIA flight time averages 1h 22m over 335 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are JAX to MIA flights cancelled?
- 1.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from JAX to MIA?
- July 2024 was the roughest month in this dataset, with only 62% of arrivals on time. The best was November 2024 at 92%. If your dates are flexible, that 29-point gap is worth planning around.
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Based on 3,556 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.