Carrier route record
AASLC→MIA
American Airlines · Salt Lake City to Miami
- Flights
- 454
- Period
- September 2025 to August 2026
- Share of route
- 56%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with American Airlines.
American on SLC to MIA lands a B+, 4 points better than the national rate of 77.3%. About 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 454 flights, with a median arrival 11 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate American on SLC 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
81.1%
Arrivals under 15 minutes late, of 450 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
0.66%
National rate is 1.89%
Whole route
84.2%
Every carrier on SLC to MIA, 818 flights
These figures cover 454 flights between September 2025 and August 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
American against every carrier on SLC to MIA
American flew 454 of the 818 flights on SLC to MIA, most of the route. Its 81.1% on time is 3 points worse than the route as a whole, which runs 84.2%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 88.1% to American at 81.1%. One 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 |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 364 | 88.1% | 58 min | 0.55% | A+ |
| American Airlines (this page) | 454 | 81.1% | 83 min | 0.66% | B+ |
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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 454 flights.
- 5am–8am—
- 8am–11am—
- 11am–2pm91 flights75.8%
- 2pm–5pm71 flights76.1%
- 5pm–8pm—
- 8pm–5am292 flights84.0%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 75.8% on time against 84.0% for 8pm–5am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 292 flights scheduled in it.
Across the year
American on SLC to MIA through the year
July is the worst month at 70.0% on time, 16 points below January, the best at 86.4%. 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 62 flights.
Across the week, Tuesday is the strongest day at 92.2% on time and Friday the weakest at 72.5%, a spread of 20 points.
Arrival by arrival
How late American on SLC to MIA runs when it is late
American on SLC to MIA often beats the schedule: 196 of 450 completed flights, 44%, arrived 15 minutes or more early. The 85 late arrivals split 22 under half an hour, 30 between 30 and 60 minutes, and 33 an hour or more.
- 15+ min early196 flights43.6%
- Within 15 min169 flights37.6%
- 15–29 min late22 flights4.9%
- 30–59 min late30 flights6.7%
- 1–2 hours late20 flights4.4%
- 2+ hours late13 flights2.9%
Scale runs 0% to 100%.
Share of 450 completed flights by arrival against schedule.
29 of 103 late departures made up the time and arrived on time, 28% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for American on SLC to MIA
The latest arrival of the period was on 18 July 2026, 15 hours 29 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 July 2026 | 15 hours 29 minutes | Carrier |
| 3 July 2026 | 13 hours 36 minutes | Carrier |
| 17 July 2026 | 4 hours 53 minutes | Carrier |
| 21 March 2026 | 3 hours 49 minutes | Late-arriving aircraft |
| 18 February 2026 | 3 hours 24 minutes | Late-arriving aircraft |
Delay causes
Why American runs late on this route
Late-arriving aircraft accounts for 48% of the 7,074 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 40%Carrier
- 11%National Airspace System
- 1%Security
- 0%Extreme weather
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,074 reported delay minutes here, that single category outweighs weather by 48 to one. The split is drawn from 7,074 reported delay minutes.
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,853 of the 7,074 delay minutes reported here.
Cancellations are rare at 0.66%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
7.3% 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 2,088 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 is a different operation and performs like one: it runs 75.1% on time across 454 flights, 6 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
One caution: this is a thin sample. 454 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 SLC to MIA
Put together: treat all of this as provisional. 454 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 81.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 450 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to MIA, every carrier
- American on MIA to SLC, the return leg
- Delta Air Lines on SLC to MIA88.1%
- American Airlines network-wide record
- Salt Lake City International (SLC) 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.