Best Time to Fly SLC to SAT: On-Time Stats by Hour & Airline
Salt Lake City International → San Antonio International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.6% of Salt Lake City (SLC) to San Antonio (SAT) flights arrived on time (1,008 scheduled flights). That is 7.0 points above the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (85% on time) and July the worst month (76%).
The cancellation rate was 0.8% (US average 1.8%).
SLC to SAT 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 | 84.6% | 63 min | 0.8% | 1,008 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to SAT
On-time arrival % by scheduled departure hour (local time), 2,020 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | 86.1% | 0.5% | 602 |
| 10am–11am | 86.4% | 0.0% | 110 |
| 11am–12pm | Limited data | 17 | |
| 1pm–2pm | 84.7% | 0.2% | 461 |
| 2pm–3pm | 75.5% | 3.0% | 101 |
| 5pm–6pm | 82.3% | 0.8% | 132 |
| 6pm–7pm | Limited data | 11 | |
| 8pm–9pm | 81.7% | 0.8% | 471 |
| 9pm–10pm | 79.1% | 0.0% | 115 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC to SAT
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) | 79.5% | -5.4 pts | 0.0% | 39 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.8% | -5.1 pts | 3.7% | 82 |
| Summer peak (Jun 15 - Aug 15) | 78.5% | -6.3 pts | 0.6% | 357 |
| All other days | 84.8% | — | 0.5% | 1,542 |
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).