San Francisco (SFO) to Miami (MIA): On-Time Performance
Data through July 2026
San Francisco (SFO) to Miami (MIA) effectively runs on two schedules. In April 2025, 93% of arrivals were on time; in July 2026 that fell to 63% — a 30-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 4.8
- last 12 months
- Duration
- 5h 35m
- scheduled
- Distance
- 2,585 mi
Best airline from SFO to MIA
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 81% | 10 min | 0.2% | 1,264 |
| American Airlines | 79% | 20 min | 0.6% | 2,311 |
Monthly on-time trend
Best time to fly from SFO to MIA
Aim for departures around 12 a.m. (100% on-time); avoid 9 p.m. departures (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 17 min |
| Tuesdaybest | 84% | 11 min |
| Wednesday | 82% | 10 min |
| Thursday | 77% | 16 min |
| Friday | 79% | 16 min |
| Saturday | 81% | 14 min |
| Sunday | 76% | 27 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations43%
- National airspace system21%
- Weather1%
Frequently asked questions
- How often are flights from SFO to MIA delayed?
- 20% of SFO–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 16 minutes.
- Which airline is most reliable from SFO to MIA?
- United Airlines has the best on-time record on this route at 81%, based on 1,264 flights. 2 airlines flew SFO–MIA frequently enough to compare in this period.
- What is the best time of day to fly from SFO to MIA?
- Departures around 12 a.m. have the best record (100% on-time), while departures around 9 p.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 SFO to MIA?
- The scheduled SFO–MIA flight time averages 5h 35m over 2,585 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are SFO to MIA flights cancelled?
- 0.4% 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 SFO to MIA?
- July 2026 was the roughest month in this dataset, with only 63% of arrivals on time. The best was April 2025 at 93%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 3,575 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.