San Juan (SJU) to Miami (MIA): On-Time Performance
Data through July 2026
The calendar drives reliability on SJU–MIA. October 2024 flights landed on schedule 89% of the time, but August 2024 dropped to 67% — a gap of 22 points. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 69%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 7.2
- last 12 months
- Duration
- 2h 55m
- scheduled
- Distance
- 1,045 mi
Best airline from SJU to MIA
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| American Airlinesmost reliable | 78% | 21 min | 0.5% | 4,197 |
| Frontier Airlines | 78% | 22 min | 1.9% | 952 |
| Spirit Airlines | 76% | 19 min | 1.7% | 530 |
Monthly on-time trend
Best time to fly from SJU to MIA
Aim for departures around 5 a.m. (94% on-time); avoid 5 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 23 min |
| Tuesday | 79% | 19 min |
| Wednesdaybest | 82% | 16 min |
| Thursday | 77% | 20 min |
| Friday | 79% | 20 min |
| Saturday | 76% | 23 min |
| Sunday | 74% | 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 aircraft52%
- Airline operations36%
- National airspace system10%
- Weather2%
Frequently asked questions
- How often are flights from SJU to MIA delayed?
- 22% of SJU–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 21 minutes.
- Which airline is most reliable from SJU to MIA?
- American Airlines has the best on-time record on this route at 78%, based on 4,197 flights. 3 airlines flew SJU–MIA frequently enough to compare in this period.
- What is the best time of day to fly from SJU to MIA?
- Departures around 5 a.m. have the best record (94% on-time), while departures around 5 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to MIA?
- The scheduled SJU–MIA flight time averages 2h 55m over 1,045 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are SJU to MIA flights cancelled?
- 0.9% 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 SJU to MIA?
- August 2024 was the roughest month in this dataset, with only 67% of arrivals on time. The best was October 2024 at 89%. If your dates are flexible, that 22-point gap is worth planning around.
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Based on 5,695 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.