St. Louis (STL) to Austin (AUS): On-Time Performance
Data through May 2026
When you fly STL to AUS matters as much as anything else about the booking: the route swung from 92% on-time in October 2024 to just 65% in July 2024. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 71%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 2.7
- last 12 months
- Duration
- 2h 7m
- scheduled
- Distance
- 721 mi
Monthly on-time trend
Best time to fly from STL to AUS
Aim for departures around 6 a.m. (98% on-time); avoid 5 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 15 min |
| Tuesday | 82% | 10 min |
| Wednesdaybest | 82% | 10 min |
| Thursday | 82% | 10 min |
| Friday | 80% | 13 min |
| Saturday | 76% | 16 min |
| Sunday | 74% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft58%
- Airline operations24%
- National airspace system15%
- Weather3%
Frequently asked questions
- How often are flights from STL to AUS delayed?
- 21% of STL–AUS 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 13 minutes.
- What is the best time of day to fly from STL to AUS?
- Departures around 6 a.m. have the best record (98% on-time), while departures around 5 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to AUS?
- The scheduled STL–AUS flight time averages 2h 7m over 721 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are STL to AUS flights cancelled?
- 0.6% 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 STL to AUS?
- July 2024 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 92%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 1,923 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.