Carrier route record

AASLC→MIA

American Airlines · Salt Lake City to Miami

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 SLC to MIA lands a B, 4 points better than the national rate of 77.6%. About one flight in five 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 12 minutes early.

The US average over the same twelve months is 77.6%, 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.

On time

81.3%

Arrivals under 15 minutes late, of 407 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

1.21%

National rate is 1.81%

Whole route

84.5%

Every carrier on SLC to MIA, 776 flights

These figures cover 412 flights between July 2025 and June 2026. The median arrival is 12 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 SLC to MIA

American flew 412 of the 776 flights on SLC to MIA, most of the route. Its 81.3% on time is 3 points worse than the route as a whole, which runs 84.5%. 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 81.3%. 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.

On-time performance by carrier on SLC to MIA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Linesthin sample	364	88.1%	57 min	0.55%	A+
American Airlines (this page)	412	81.3%	66 min	1.21%	B

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 412 flights.

5am–8am—
8am–11am—
11am–2pm91 flights75.8%
2pm–5pm48 flights81.2%
5pm–8pm—
8pm–5am273 flights83.2%

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 83.2% 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 273 flights scheduled in it.

Across the year

American on SLC to MIA through the year

Jul–Sep 202536 flights70.6%
Oct–Dec 202570 flights82.9%
Jan–Mar 2026181 flights84.8%
Apr–Jun 2026125 flights78.4%

Scale runs 60% to 90%. 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 81.3% on time across 412 flights.

American on SLC to MIA did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.8% on time and its weakest Jul–Sep 2025 at 70.6%, a swing of 14 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, Tuesday is the strongest day at 92.3% on time and Saturday the weakest at 71.7%. 21 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. Late-arriving aircraft accounts for 60% of the 4,990 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.

Late-arriving aircraft
60%
Carrier
24%
National Airspace System
15%
Security
2%
Extreme weather
0%

60% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,990 reported delay minutes here, that single category outweighs weather by 60 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,990 reported delay minutes.

Cancellations sit at 1.21% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

6.9% 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 76.8% on time across 412 flights, 5 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 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 SLC to MIA

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 81.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 407 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures