Miami (MIA) to San Juan (SJU): On-Time Performance
Data through May 2026
Miami (MIA) to San Juan (SJU) effectively runs on two schedules. In October 2024, 90% of arrivals were on time; in July 2025 that fell to 63% — a 28-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 67%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 7.2
- last 12 months
- Duration
- 2h 39m
- scheduled
- Distance
- 1,045 mi
Best airline from MIA to SJU
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlinesmost reliable | 76% | 24 min | 2.3% | 944 |
| American Airlines | 76% | 18 min | 0.5% | 3,977 |
| Spirit Airlines | 71% | 24 min | 2.4% | 580 |
Monthly on-time trend
Best time to fly from MIA to SJU
Aim for departures around 7 a.m. (93% on-time); avoid 12 a.m. departures (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 19 min |
| Tuesday | 80% | 17 min |
| Wednesdaybest | 82% | 15 min |
| Thursday | 74% | 19 min |
| Friday | 77% | 18 min |
| Saturday | 70% | 23 min |
| Sunday | 70% | 26 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations37%
- National airspace system15%
- Weather5%
Frequently asked questions
- How often are flights from MIA to SJU delayed?
- 24% of MIA–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 20 minutes.
- Which airline is most reliable from MIA to SJU?
- Frontier Airlines has the best on-time record on this route at 76%, based on 944 flights. 3 airlines flew MIA–SJU frequently enough to compare in this period.
- What is the best time of day to fly from MIA to SJU?
- Departures around 7 a.m. have the best record (93% on-time), while departures around 12 a.m. have the worst (53%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to SJU?
- The scheduled MIA–SJU flight time averages 2h 39m over 1,045 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are MIA to SJU flights cancelled?
- 1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from MIA to SJU?
- July 2025 was the roughest month in this dataset, with only 63% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 5,517 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.