Best Time to Fly SAT to SLC: On-Time Stats by Hour & Airline
San Antonio International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 86.7% of San Antonio (SAT) to Salt Lake City (SLC) flights arrived on time (1,009 scheduled flights). That is 9.0 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, Wednesday was the most reliable day (90% on time) and December the worst month (81%).
The cancellation rate was 0.9% (US average 1.8%).
SAT 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 | 86.7% | 75 min | 0.9% | 1,009 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to SLC
On-time arrival % by scheduled departure hour (local time), 2,020 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.9% | 0.0% | 39 |
| 6am–7am | 93.4% | 0.6% | 168 |
| 7am–8am | 95.2% | 0.8% | 399 |
| 8am–9am | 94.3% | 0.0% | 123 |
| 12pm–1pm | 78.4% | 0.5% | 419 |
| 1pm–2pm | 83.3% | 2.5% | 81 |
| 2pm–3pm | 87.7% | 0.0% | 188 |
| 5pm–6pm | 86.5% | 0.8% | 120 |
| 6pm–7pm | 81.5% | 0.2% | 417 |
| 7pm–8pm | 81.0% | 4.5% | 66 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAT 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) | 84.6% | -2.6 pts | 0.0% | 39 |
| Christmas & New Year (Dec 20 - Jan 3) | 87.3% | +0.1 pts | 3.7% | 82 |
| Summer peak (Jun 15 - Aug 15) | 83.6% | -3.6 pts | 0.6% | 357 |
| All other days | 87.2% | — | 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).