Miami International (MIA) Delays and On-Time Departures
Miami, FL · ranked 299th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
74.0% of the 111,186 flights scheduled to depart Miami (MIA) in the last 12 months left on time, 3.4 points below the US average of 77.4%.
That ranks 299th of 333 US airports tracked on this site, with 1.6% of departures cancelled.
Among airlines at Miami (MIA), Envoy Air left on time most often (86.3%).
Over 24 months, Tuesday was the most reliable day (80% on time) and July the worst month (65%).
Best time of day to fly out of Miami (MIA)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 12 | |
| 5am–6am | 90.5% | 1.9% | 2,142 |
| 6am–7am | 91.8% | 1.5% | 9,910 |
| 7am–8am | 91.0% | 0.9% | 13,618 |
| 8am–9am | 89.2% | 0.9% | 18,793 |
| 9am–10am | 84.4% | 1.1% | 9,774 |
| 10am–11am | 82.3% | 1.0% | 6,490 |
| 11am–12pm | 76.4% | 1.3% | 8,133 |
| 12pm–1pm | 76.1% | 1.1% | 9,557 |
| 1pm–2pm | 73.8% | 1.5% | 9,971 |
| 2pm–3pm | 71.1% | 1.5% | 11,470 |
| 3pm–4pm | 69.1% | 1.7% | 14,199 |
| 4pm–5pm | 70.8% | 1.6% | 12,812 |
| 5pm–6pm | 66.9% | 1.8% | 15,509 |
| 6pm–7pm | 66.4% | 2.0% | 12,845 |
| 7pm–8pm | 66.3% | 1.8% | 19,404 |
| 8pm–9pm | 66.7% | 1.7% | 14,423 |
| 9pm–10pm | 69.7% | 1.9% | 21,163 |
| 10pm–11pm | 69.2% | 1.7% | 11,425 |
| 11pm–12am | 69.3% | 1.4% | 583 |
Airlines at MIA ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Envoy Air | 86.3% | 82.6% | 0.8% | 14,139 |
| United Airlines | 79.5% | 78.2% | 1.0% | 6,821 |
| Frontier Airlines | 75.7% | 73.9% | 2.3% | 4,324 |
| Delta Air Lines | 74.3% | 74.4% | 2.2% | 11,640 |
| Alaska Airlines | 71.9% | 71.2% | 1.3% | 533 |
| American Airlines | 71.6% | 71.9% | 1.5% | 64,171 |
| JetBlue | 71.4% | 74.3% | 0.0% | 35 |
| Republic Airways | 70.8% | 69.9% | 1.4% | 991 |
| Spirit Airlines | 68.5% | 65.7% | 4.8% | 3,184 |
| Southwest Airlines | 64.3% | 70.1% | 1.1% | 5,348 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of MIA
On-time departures by day, 24 months.
Best month to fly out of MIA
On-time departures by month, 24 months.
Holiday travel at Miami (MIA)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 76.5% | -0.2 pts | 0.4% | 4,299 |
| Christmas & New Year (Dec 20 - Jan 3) | 69.8% | -6.9 pts | 1.3% | 10,188 |
| Summer peak (Jun 15 - Aug 15) | 66.7% | -10.0 pts | 2.4% | 36,102 |
| All other days | 76.7% | — | 1.4% | 171,644 |
Monthly on-time departure trend at MIA
On-time departure % each month, with the 12-month US average for reference.
Routes from Miami (MIA)
Every route from MIA with its own page, by number of flights (last 12 months, on-time arrivals).