Best Time to Fly SFO to MIA: On-Time Stats by Hour & Airline
San Francisco International → Miami International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.4% of San Francisco (SFO) to Miami (MIA) flights arrived on time (1,746 scheduled flights). That is 1.2 points below the national average of 77.6%.
United Airlines was the most punctual of the 2 airlines on the route at 77.9%, while American Airlines trailed at 75.6%.
October has been the best month (88% on time) and Sunday the weakest day of the week (77%).
0.5% of flights were cancelled, versus 1.8% nationally.
SFO 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 |
|---|---|---|---|---|
| United Airlines | 77.9% | 40 min | 0.0% | 613 |
| American Airlines | 75.6% | 81 min | 0.8% | 1,133 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to MIA
On-time arrival % by scheduled departure hour (local time), 3,455 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 100.0% | 0.0% | 36 |
| 6am–7am | 88.6% | 0.0% | 44 |
| 7am–8am | 90.9% | 0.2% | 474 |
| 8am–9am | 77.8% | 0.5% | 825 |
| 11am–12pm | 61.3% | 0.0% | 62 |
| 12pm–1pm | 75.0% | 0.0% | 285 |
| 1pm–2pm | 75.5% | 0.7% | 430 |
| 9pm–10pm | 52.8% | 0.0% | 72 |
| 10pm–11pm | 85.3% | 1.0% | 405 |
| 11pm–12am | 81.0% | 0.1% | 822 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SFO 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) | 88.2% | +5.0 pts | 0.0% | 68 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.8% | -14.5 pts | 0.7% | 145 |
| Summer peak (Jun 15 - Aug 15) | 70.0% | -13.3 pts | 0.3% | 639 |
| All other days | 83.2% | — | 0.4% | 2,603 |
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).