Best Time to Fly SJU to MIA: On-Time Stats by Hour & Airline
Luis Munoz Marin International → Miami International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.2% of San Juan (SJU) to Miami (MIA) flights arrived on time (2,643 scheduled flights). That is 0.6 points above the national average of 77.6%.
Among 3 airlines, American Airlines led with 78.7% on time and Spirit Airlines was last with 71.3%.
Over 24 months, Wednesday was the most reliable day (83% on time) and August the worst month (70%).
The cancellation rate was 1.0% (US average 1.8%).
SJU to MIA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| American Airlines | 78.7% | 89 min | 0.7% | 2,110 |
| Frontier Airlines | 78.4% | 100 min | 1.9% | 379 |
| Spirit Airlines | 71.3% | 101 min | 2.6% | 154 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJU to MIA
On-time arrival % by scheduled departure hour (local time), 5,411 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 3am–4am | Limited data | 20 | |
| 5am–6am | 94.0% | 1.3% | 153 |
| 6am–7am | 93.4% | 1.0% | 520 |
| 7am–8am | 91.0% | 0.4% | 267 |
| 8am–9am | 85.4% | 0.0% | 104 |
| 9am–10am | 89.4% | 2.3% | 87 |
| 10am–11am | 85.5% | 0.5% | 215 |
| 11am–12pm | 85.0% | 0.6% | 530 |
| 12pm–1pm | 84.0% | 0.8% | 367 |
| 1pm–2pm | 79.4% | 0.6% | 541 |
| 2pm–3pm | 76.3% | 1.0% | 304 |
| 3pm–4pm | 66.2% | 0.0% | 323 |
| 4pm–5pm | 64.0% | 0.8% | 395 |
| 5pm–6pm | 62.3% | 1.6% | 384 |
| 6pm–7pm | 67.7% | 0.5% | 445 |
| 7pm–8pm | 69.8% | 1.2% | 399 |
| 8pm–9pm | 77.4% | 1.1% | 94 |
| 9pm–10pm | 82.3% | 0.0% | 182 |
| 10pm–11pm | 73.7% | 3.8% | 79 |
| 11pm–12am | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SJU to MIA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 76.7% | -2.1 pts | 0.0% | 116 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.3% | -3.5 pts | 4.3% | 279 |
| Summer peak (Jun 15 - Aug 15) | 76.0% | -2.8 pts | 1.1% | 902 |
| All other days | 78.8% | — | 0.6% | 4,114 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).