Best Time to Fly AUS to SLC: On-Time Stats by Hour & Airline
Austin - Bergstrom International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.0% of Austin (AUS) to Salt Lake City (SLC) flights arrived on time (1,785 scheduled flights). That is 4.4 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 3 airlines on the route at 86.9%, while Southwest Airlines trailed at 68.7%.
September has been the best month (91% on time) and Thursday the weakest day of the week (79%).
0.7% of flights were cancelled, versus 1.8% nationally.
AUS 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 | 86.9% | 94 min | 0.8% | 1,073 |
| SkyWest Airlines | 86.5% | 74 min | 1.2% | 241 |
| Southwest Airlines | 68.7% | 60 min | 0.2% | 471 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly AUS to SLC
On-time arrival % by scheduled departure hour (local time), 3,541 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 87.9% | 0.0% | 190 |
| 6am–7am | 88.7% | 4.6% | 65 |
| 7am–8am | 90.0% | 2.0% | 51 |
| 8am–9am | 93.4% | 0.5% | 735 |
| 9am–10am | 80.6% | 0.0% | 72 |
| 10am–11am | 91.3% | 1.4% | 70 |
| 11am–12pm | 89.3% | 0.0% | 149 |
| 12pm–1pm | 83.8% | 0.6% | 646 |
| 1pm–2pm | 83.2% | 0.0% | 108 |
| 2pm–3pm | 77.2% | 0.0% | 234 |
| 3pm–4pm | 77.8% | 0.0% | 72 |
| 4pm–5pm | 75.1% | 0.0% | 173 |
| 5pm–6pm | 65.2% | 0.0% | 118 |
| 6pm–7pm | 82.9% | 0.8% | 471 |
| 7pm–8pm | 64.8% | 0.0% | 333 |
| 8pm–9pm | 54.5% | 0.0% | 44 |
| 9pm–10pm | Limited data | 10 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on AUS 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) | 86.2% | +1.9 pts | 0.0% | 65 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.3% | -6.0 pts | 0.0% | 129 |
| Summer peak (Jun 15 - Aug 15) | 75.8% | -8.5 pts | 0.5% | 662 |
| All other days | 84.3% | — | 0.5% | 2,685 |
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).