Best Time to Fly DEN to MIA: On-Time Stats by Hour & Airline
Denver International → Miami International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 74.4% of Denver (DEN) to Miami (MIA) flights arrived on time (2,468 scheduled flights). That is 3.2 points below the national average of 77.6%.
American Airlines was the most punctual of the 4 airlines on the route at 76.8%, while Southwest Airlines trailed at 65.3%.
October has been the best month (84% on time) and Friday the weakest day of the week (69%).
0.5% of flights were cancelled, versus 1.8% nationally.
DEN 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 |
|---|---|---|---|---|
| American Airlines | 76.8% | 98 min | 0.9% | 886 |
| United Airlines | 75.7% | 64 min | 0.1% | 910 |
| Frontier Airlines | 73.5% | 60 min | 0.6% | 349 |
| Southwest Airlines | 65.3% | 50 min | 0.6% | 323 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to MIA
On-time arrival % by scheduled departure hour (local time), 4,991 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 80.8% | 2.0% | 403 |
| 5am–6am | Limited data | 5 | |
| 6am–7am | 73.7% | 0.0% | 152 |
| 7am–8am | 81.9% | 1.3% | 157 |
| 8am–9am | 77.4% | 0.0% | 62 |
| 9am–10am | 75.8% | 0.3% | 359 |
| 10am–11am | 71.0% | 0.0% | 523 |
| 11am–12pm | 67.2% | 0.5% | 199 |
| 12pm–1pm | 78.1% | 0.3% | 374 |
| 1pm–2pm | 71.0% | 0.8% | 391 |
| 2pm–3pm | 70.2% | 0.7% | 279 |
| 3pm–4pm | 71.7% | 0.3% | 330 |
| 4pm–5pm | 76.3% | 0.0% | 135 |
| 5pm–6pm | 71.2% | 0.2% | 435 |
| 6pm–7pm | 68.1% | 0.6% | 167 |
| 7pm–8pm | Limited data | 15 | |
| 8pm–9pm | 87.1% | 0.0% | 31 |
| 10pm–11pm | Limited data | 9 | |
| 11pm–12am | 74.9% | 0.7% | 965 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN 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) | 82.8% | +5.9 pts | 1.0% | 100 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.5% | -10.4 pts | 0.0% | 248 |
| Summer peak (Jun 15 - Aug 15) | 59.6% | -17.4 pts | 1.0% | 775 |
| All other days | 77.0% | — | 0.5% | 3,868 |
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).