Austin (AUS) to St. Louis (STL): On-Time Performance
Data through May 2026
When you fly AUS to STL matters as much as anything else about the booking: the route swung from 93% on-time in September 2024 to just 69% in July 2024. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (94% vs 63%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 0.3%
- Flights/day
- 2.7
- last 12 months
- Duration
- 2h 5m
- scheduled
- Distance
- 721 mi
Monthly on-time trend
Best time to fly from AUS to STL
Aim for departures around 6 a.m. (99% on-time); avoid 5 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 82% | 9 min |
| Tuesdaybest | 87% | 8 min |
| Wednesday | 85% | 7 min |
| Thursday | 83% | 8 min |
| Friday | 79% | 12 min |
| Saturday | 86% | 7 min |
| Sunday | 74% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft62%
- Airline operations27%
- National airspace system9%
- Weather2%
Frequently asked questions
- How often are flights from AUS to STL delayed?
- 18% of AUS–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 10 minutes.
- What is the best time of day to fly from AUS to STL?
- Departures around 6 a.m. have the best record (99% on-time), while departures around 5 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from AUS to STL?
- The scheduled AUS–STL flight time averages 2h 5m over 721 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are AUS to STL flights cancelled?
- 0.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from AUS to STL?
- July 2024 was the roughest month in this dataset, with only 69% of arrivals on time. The best was September 2024 at 93%. If your dates are flexible, that 25-point gap is worth planning around.
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Based on 1,924 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.