Best Time to Fly AUS to STL: On-Time Stats by Hour & Airline
Austin - Bergstrom International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.5% of Austin (AUS) to St. Louis (STL) flights arrived on time (973 scheduled flights). That is in line with the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (87% on time) and June the worst month (69%).
The cancellation rate was 0.1% (US average 1.8%).
AUS to STL 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 | 77.5% | 50 min | 0.1% | 973 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly AUS to STL
On-time arrival % by scheduled departure hour (local time), 1,924 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.8% | 0.6% | 313 |
| 6am–7am | 98.5% | 0.8% | 132 |
| 7am–8am | 93.8% | 0.0% | 177 |
| 8am–9am | Limited data | 17 | |
| 9am–10am | 84.4% | 2.2% | 46 |
| 10am–11am | 87.2% | 0.0% | 47 |
| 11am–12pm | 84.7% | 0.0% | 99 |
| 12pm–1pm | 83.5% | 0.0% | 230 |
| 1pm–2pm | 68.8% | 0.0% | 144 |
| 2pm–3pm | 82.9% | 0.0% | 41 |
| 3pm–4pm | 76.0% | 0.4% | 226 |
| 4pm–5pm | 66.8% | 0.0% | 211 |
| 5pm–6pm | 55.6% | 0.0% | 225 |
| 6pm–7pm | Limited data | 14 | |
| 7pm–8pm | Limited data | 2 | |
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 STL
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% | -3.1 pts | 0.0% | 39 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.4% | -1.2 pts | 0.0% | 86 |
| Summer peak (Jun 15 - Aug 15) | 73.1% | -9.5 pts | 0.0% | 354 |
| All other days | 82.6% | — | 0.3% | 1,445 |
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).