St. Louis (STL) to Austin (AUS): On-Time Performance
Data through July 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 63% in June 2026. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 70%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.5%
- 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 10 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 16 min |
| Tuesday | 81% | 10 min |
| Wednesday | 82% | 10 min |
| Thursdaybest | 82% | 11 min |
| Friday | 78% | 14 min |
| Saturday | 75% | 16 min |
| Sunday | 73% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft59%
- Airline operations23%
- National airspace system14%
- Weather3%
Frequently asked questions
- How often are flights from STL to AUS delayed?
- 22% of STL–AUS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 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 10 p.m. have the worst (63%). 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 22% of the time.
- How often are STL to AUS flights cancelled?
- 0.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from STL to AUS?
- June 2026 was the roughest month in this dataset, with only 63% of arrivals on time. The best was October 2024 at 92%. If your dates are flexible, that 29-point gap is worth planning around.
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Based on 2,012 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.