Carrier route record
AAMIA→SLC
American Airlines · Miami to Salt Lake City
- Flights
- 412
- Period
- July 2025 to June 2026
- Share of route
- 53%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with American Airlines.
American on MIA to SLC lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 412 flights, with a median arrival 8 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate American on MIA to SLC from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.8%
Arrivals under 15 minutes late, of 406 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
1.21%
National rate is 1.81%
Whole route
76.7%
Every carrier on MIA to SLC, 776 flights
These figures cover 412 flights between July 2025 and June 2026. The median arrival is 8 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.
Carrier by carrier
American against every carrier on MIA to SLC
American flew 412 of the 776 flights on MIA to SLC, most of the route. Its 76.8% on time is about level with the route as a whole at 76.7%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from American at 76.8% to Delta at 76.5%. 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 |
|---|---|---|---|---|---|
| American Airlines (this page) | 412 | 76.8% | 67 min | 1.21% | B |
| Delta Air Linesthin sample | 364 | 76.5% | 57 min | 0.55% | B+ |
Departure window
When American runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am139 flights88.3%
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm128 flights69.0%
- 8pm–5am145 flights72.7%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 88.3% of the time, against 69.0% for the evening window. That is 19 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 145 flights scheduled in it.
Across the year
American on MIA to SLC through the year
- Jul–Sep 202536 flights58.8%
- Oct–Dec 202571 flights77.5%
- Jan–Mar 2026180 flights78.4%
- Apr–Jun 2026125 flights79.2%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 76.8% on time across 412 flights.
American on MIA to SLC did not run the same all year. Its best quarter was Apr–Jun 2026 at 79.2% on time and its weakest Jul–Sep 2025 at 58.8%, a swing of 20 points on roughly 103 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Wednesday is the strongest day at 88.7% on time and Saturday the weakest at 68.3%. 20 points is a smaller lever than departure hour, but it is free.
Delay causes
Why American runs late on this route
One category carries most of the weight here. Carrier accounts for 50% of the 6,279 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 50%Carrier
- 30%Late-arriving aircraft
- 17%National Airspace System
- 2%Extreme weather
- 0%Security
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,155 of the 6,279 delay minutes reported here. The split is drawn from 6,279 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 88.3% on time here.
Cancellations sit at 1.21% against a national 1.81%, which is ordinary. Diversions add another 0.24%.
Connections and stage length
What a delay here costs
7.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, 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 81.3% on time across 412 flights, 5 points above 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 5 points of difference.
One caution: this is a thin sample. 412 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 MIA to SLC
Put together: treat all of this as provisional. 412 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 76.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 406 completed flights over 12 months sit behind that.
Related
Where to go next
- MIA to SLC, every carrier
- American on SLC to MIA, the return leg
- Delta Air Lines on MIA to SLC76.5%
- American Airlines network-wide record
- Miami International (MIA) delay statistics
- Salt Lake City International (SLC) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- How to read this site: grades, sample sizes, and honest caveats
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.