Best Time to Fly MIA to DEN: On-Time Stats by Hour & Airline
Miami International → Denver International
Data through July 2026 · Last updated October 18, 2026
2,469 flights were scheduled from Miami (MIA) to Denver (DEN) in the last 12 months, and 76.7% of those that flew arrived on time, 1.0 points below the US average of 77.6%.
Among 4 airlines, United Airlines led with 82.9% on time and Southwest Airlines was last with 54.9%.
Over 24 months, Wednesday was the most reliable day (81% on time) and August the worst month (65%).
The cancellation rate was 0.5% (US average 1.8%).
MIA to DEN 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 | 82.9% | 71 min | 0.1% | 910 |
| Frontier Airlines | 82.4% | 110 min | 1.1% | 351 |
| American Airlines | 75.9% | 60 min | 0.8% | 885 |
| Southwest Airlines | 54.9% | 63 min | 0.0% | 323 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MIA to DEN
On-time arrival % by scheduled departure hour (local time), 4,996 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 73.7% | 0.0% | 57 |
| 6am–7am | 88.8% | 1.1% | 535 |
| 7am–8am | 91.6% | 0.2% | 554 |
| 8am–9am | 87.6% | 0.3% | 743 |
| 9am–10am | 84.5% | 0.4% | 463 |
| 10am–11am | 86.0% | 3.4% | 59 |
| 11am–12pm | 75.0% | 0.0% | 60 |
| 12pm–1pm | 75.9% | 0.0% | 134 |
| 1pm–2pm | 60.3% | 0.0% | 66 |
| 2pm–3pm | 70.5% | 0.7% | 150 |
| 3pm–4pm | 70.3% | 0.1% | 801 |
| 4pm–5pm | 51.4% | 0.5% | 185 |
| 5pm–6pm | 68.0% | 1.3% | 155 |
| 6pm–7pm | 68.9% | 0.0% | 134 |
| 7pm–8pm | 77.2% | 1.4% | 138 |
| 8pm–9pm | 64.5% | 0.4% | 498 |
| 9pm–10pm | 64.1% | 1.5% | 261 |
| 10pm–11pm | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MIA to DEN
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) | 72.3% | -6.3 pts | 0.0% | 101 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.6% | -3.0 pts | 0.8% | 248 |
| Summer peak (Jun 15 - Aug 15) | 72.4% | -6.1 pts | 0.8% | 776 |
| All other days | 78.6% | — | 0.5% | 3,871 |
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).