Carrier route record
AADEN→MIA
American Airlines · Denver to Miami
- Flights
- 890
- Period
- September 2025 to August 2026
- Share of route
- 36%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with American Airlines.
American on DEN to MIA lands a B, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 890 flights, with a median arrival 10 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate American on DEN to MIA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.8%
Arrivals under 15 minutes late, of 878 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
1.01%
National rate is 1.89%
Whole route
74.9%
Every carrier on DEN to MIA, 2,443 flights
These figures cover 890 flights between September 2025 and August 2026. Beyond the headline rate, 8.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
American against every carrier on DEN to MIA
American flew 890 of the 2,443 flights on DEN to MIA, about 36% of it. Its 77.8% on time is 3 points better than the route as a whole, which runs 74.9%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from American at 77.8% to Southwest at 64.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| American Airlines (this page) | 890 | 77.8% | 96 min | 1.01% | B |
| United Airlines | 877 | 76.3% | 60 min | 0.00% | B+ |
| Frontier Airlinesthin sample | 353 | 73.9% | 63 min | 0.28% | C+ |
| Southwest Airlinesthin sample | 323 | 64.5% | 48 min | 0.62% | D+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When American runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 890 flights.
- 5am–8am117 flights84.3%
- 8am–11am46 flights76.1%
- 11am–2pm296 flights78.8%
- 2pm–5pm66 flights76.9%
- 5pm–8pm—
- 8pm–5am365 flights75.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 84.3% of the time, against 75.2% for the overnight window. That is 9 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 365 flights scheduled in it.
Across the year
American on DEN to MIA through the year
July is the worst month at 66.7% on time, 26 points below February, the best at 92.9%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. January was the busiest month here, with 93 flights.
Across the week, Tuesday is the strongest day at 83.3% on time and Friday the weakest at 71.4%, a spread of 12 points.
Arrival by arrival
How late American on DEN to MIA runs when it is late
American on DEN to MIA often beats the schedule: 357 of 878 completed flights, 41%, arrived 15 minutes or more early. The 195 late arrivals split 58 under half an hour, 60 between 30 and 60 minutes, and 77 an hour or more.
- 15+ min early357 flights40.7%
- Within 15 min326 flights37.1%
- 15–29 min late58 flights6.6%
- 30–59 min late60 flights6.8%
- 1–2 hours late50 flights5.7%
- 2+ hours late27 flights3.1%
Scale runs 0% to 100%.
Share of 878 completed flights by arrival against schedule.
67 of 233 late departures made up the time and arrived on time, 29% of them. 29 flights left on time and still arrived late.
The worst days
Worst days for American on DEN to MIA
The latest arrival of the period was on 25 February 2026, 31 hours 25 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 February 2026 | 31 hours 25 minutes | Carrier |
| 12 December 2025 | 25 hours 50 minutes | Carrier |
| 3 April 2026 | 13 hours 38 minutes | Late-arriving aircraft |
| 30 January 2026 | 12 hours 29 minutes | Late-arriving aircraft |
| 18 December 2025 | 10 hours 5 minutes | Carrier |
Delay causes
Why American runs late on this route
Carrier accounts for 48% of the 19,000 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 40%Late-arriving aircraft
- 11%National Airspace System
- 1%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 19,000 reported delay minutes here, that single category outweighs weather by 40 to one. The split is drawn from 18,646 reported delay minutes.
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 9,000 of the 19,000 delay minutes reported here.
Cancellations sit at 1.01% against a national 1.89%, which is ordinary. Diversions add another 0.34%.
Connections and stage length
What a delay here costs
8.8% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
At 1,709 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg runs 76.1% on time across 889 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 890 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking American on DEN to MIA
Put together: treat all of this as provisional. 890 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 878 completed flights over 12 months sit behind that.
Related
Where to go next
- DEN to MIA, every carrier
- American on MIA to DEN, the return leg
- United Airlines on DEN to MIA76.3%
- Frontier Airlines on DEN to MIA73.9%
- Southwest Airlines on DEN to MIA64.5%
- American Airlines network-wide record
- Denver International (DEN) delay statistics
- Miami International (MIA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.