Miami (MIA) to Denver (DEN): On-Time Performance
Data through May 2026
Miami (MIA) to Denver (DEN) effectively runs on two schedules. In October 2024, 93% of arrivals were on time; in July 2024 that fell to 59% — a 34-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 66%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 6.9
- last 12 months
- Duration
- 4h 34m
- scheduled
- Distance
- 1,709 mi
Best airline from MIA to DEN
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 80% | 16 min | 0.3% | 1,854 |
| Frontier Airlines | 77% | 24 min | 1.3% | 779 |
| American Airlines | 73% | 22 min | 1.1% | 1,763 |
| Southwest Airlines | 73% | 16 min | 0.8% | 662 |
Monthly on-time trend
Best time to fly from MIA to DEN
Aim for departures around 7 a.m. (89% on-time); avoid 1 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 23 min |
| Tuesdaybest | 80% | 16 min |
| Wednesday | 79% | 13 min |
| Thursday | 77% | 21 min |
| Friday | 76% | 20 min |
| Saturday | 75% | 20 min |
| Sunday | 72% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations33%
- National airspace system19%
- Weather5%
Frequently asked questions
- How often are flights from MIA to DEN delayed?
- 24% of MIA–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 19 minutes.
- Which airline is most reliable from MIA to DEN?
- United Airlines has the best on-time record on this route at 80%, based on 1,854 flights. 4 airlines flew MIA–DEN frequently enough to compare in this period.
- What is the best time of day to fly from MIA to DEN?
- Departures around 7 a.m. have the best record (89% on-time), while departures around 1 p.m. have the worst (58%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to DEN?
- The scheduled MIA–DEN flight time averages 4h 34m over 1,709 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are MIA to DEN flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from MIA to DEN?
- July 2024 was the roughest month in this dataset, with only 59% of arrivals on time. The best was October 2024 at 93%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 5,058 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.