Denver (DEN) to Miami (MIA): On-Time Performance
Data through July 2026
When you fly DEN to MIA matters as much as anything else about the booking: the route swung from 88% on-time in October 2024 to just 49% in August 2024. Across the full period the route averages 73% on-time against a national 78%.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 6.8
- last 12 months
- Duration
- 3h 57m
- scheduled
- Distance
- 1,709 mi
Best airline from DEN to MIA
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| American Airlinesmost reliable | 76% | 24 min | 1.0% | 1,826 |
| United Airlines | 74% | 16 min | 0.1% | 1,914 |
| Frontier Airlines | 69% | 21 min | 1.0% | 776 |
| Southwest Airlines | 67% | 21 min | 0.4% | 691 |
Monthly on-time trend
Best time to fly from DEN to MIA
Aim for departures around 8 p.m. (87% on-time); avoid 6 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 23 min |
| Tuesdaybest | 77% | 15 min |
| Wednesday | 76% | 17 min |
| Thursday | 74% | 17 min |
| Friday | 69% | 27 min |
| Saturday | 72% | 19 min |
| Sunday | 71% | 23 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations36%
- National airspace system23%
- Weather3%
Frequently asked questions
- How often are flights from DEN to MIA delayed?
- 27% of DEN–MIA 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 20 minutes.
- Which airline is most reliable from DEN to MIA?
- American Airlines has the best on-time record on this route at 76%, based on 1,826 flights. 4 airlines flew DEN–MIA frequently enough to compare in this period.
- What is the best time of day to fly from DEN to MIA?
- Departures around 8 p.m. have the best record (87% on-time), while departures around 6 p.m. have the worst (64%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to MIA?
- The scheduled DEN–MIA flight time averages 3h 57m over 1,709 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are DEN to MIA 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 DEN to MIA?
- August 2024 was the roughest month in this dataset, with only 49% of arrivals on time. The best was October 2024 at 88%. If your dates are flexible, that 39-point gap is worth planning around.
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Based on 5,207 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.