Best Time to Fly MIA to SLC: On-Time Stats by Hour & Airline
Miami International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.7% of Miami (MIA) to Salt Lake City (SLC) flights arrived on time (796 scheduled flights). That is 0.9 points below the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 79.0% on time and American Airlines was last with 74.8%.
Over 24 months, Tuesday was the most reliable day (86% on time) and July the worst month (58%).
The cancellation rate was 0.6% (US average 1.8%).
MIA to SLC on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 79.0% | 65 min | 0.6% | 364 |
| American Airlines | 74.8% | 67 min | 0.7% | 432 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MIA to SLC
On-time arrival % by scheduled departure hour (local time), 1,486 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 80.9% | 1.3% | 154 |
| 7am–8am | 94.4% | 0.0% | 71 |
| 8am–9am | 87.0% | 0.9% | 110 |
| 9am–10am | 86.4% | 0.7% | 155 |
| 4pm–5pm | Limited data | 23 | |
| 5pm–6pm | 83.3% | 0.0% | 30 |
| 6pm–7pm | 69.0% | 0.0% | 426 |
| 7pm–8pm | 72.8% | 0.8% | 360 |
| 8pm–9pm | 66.2% | 1.3% | 153 |
| 9pm–10pm | Limited data | 4 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MIA to SLC
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 71.1% | -7.3 pts | 0.0% | 90 |
| Summer peak (Jun 15 - Aug 15) | 65.5% | -12.9 pts | 0.8% | 254 |
| All other days | 78.4% | — | 0.6% | 1,116 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).