Miami (MIA) to Denver (DEN): On-Time Performance
Data through July 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 (87% vs 66%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 6.8
- last 12 months
- Duration
- 4h 33m
- scheduled
- Distance
- 1,709 mi
Best airline from MIA to DEN
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 80% | 16 min | 0.2% | 1,915 |
| Frontier Airlines | 79% | 20 min | 1.0% | 780 |
| American Airlines | 74% | 21 min | 0.9% | 1,826 |
| Southwest Airlines | 69% | 20 min | 0.3% | 691 |
Monthly on-time trend
Best time to fly from MIA to DEN
Aim for departures around 7 a.m. (91% on-time); avoid 4 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 23 min |
| Tuesdaybest | 80% | 16 min |
| Wednesday | 80% | 12 min |
| Thursday | 77% | 20 min |
| Friday | 77% | 19 min |
| Saturday | 75% | 20 min |
| Sunday | 73% | 21 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 operations34%
- National airspace system21%
- Weather4%
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 2024-07 and 2026-07. 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 1,915 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 (91% on-time), while departures around 4 p.m. have the worst (51%). 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 33m 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?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, 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 5,212 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.