Best Time to Fly STL to AUS: On-Time Stats by Hour & Airline
St Louis Lambert International → Austin - Bergstrom International
Data through July 2026 · Last updated October 18, 2026
972 flights were scheduled from St. Louis (STL) to Austin (AUS) in the last 12 months, and 75.9% of those that flew arrived on time, 1.7 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
September has been the best month (90% on time) and Sunday the weakest day of the week (73%).
0.4% of flights were cancelled, versus 1.8% nationally.
STL to AUS 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 |
|---|---|---|---|---|
| Southwest Airlines | 75.9% | 51 min | 0.4% | 972 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to AUS
On-time arrival % by scheduled departure hour (local time), 1,923 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 97.8% | 0.0% | 46 |
| 7am–8am | Limited data | 21 | |
| 8am–9am | 87.7% | 0.0% | 163 |
| 9am–10am | 85.1% | 0.8% | 122 |
| 10am–11am | 89.4% | 0.8% | 360 |
| 11am–12pm | 86.1% | 0.0% | 37 |
| 12pm–1pm | 84.8% | 0.0% | 34 |
| 1pm–2pm | 76.1% | 0.0% | 92 |
| 2pm–3pm | 70.7% | 0.0% | 216 |
| 3pm–4pm | 72.3% | 0.7% | 142 |
| 4pm–5pm | 89.3% | 0.0% | 56 |
| 5pm–6pm | 68.1% | 0.0% | 69 |
| 6pm–7pm | 66.7% | 0.0% | 55 |
| 7pm–8pm | 83.7% | 0.0% | 49 |
| 8pm–9pm | 81.7% | 1.7% | 117 |
| 9pm–10pm | 71.3% | 0.6% | 172 |
| 10pm–11pm | 63.3% | 1.7% | 172 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL to AUS
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) | 66.7% | -14.5 pts | 0.0% | 39 |
| Christmas & New Year (Dec 20 - Jan 3) | 83.7% | +2.6 pts | 0.0% | 86 |
| Summer peak (Jun 15 - Aug 15) | 71.0% | -10.1 pts | 0.0% | 354 |
| All other days | 81.1% | — | 0.8% | 1,444 |
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).