Historical on-time performance
Austin to St. Louis
722 miData through Dec 2025Source: US DOT · BTS
Flights on AUS–STL arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 970 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time80%Medianon timep9030 minCancel0.4%Flights970
Why flights run late
Delay causes
- Airline25%
- Weather4%
- Air traffic (NAS)8%
- Late aircraft63%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly AUS → STL
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 95% on time.
- Mornings95% on time · p90 on time · 1,038 flights
- Middays80% on time · p90 30 min · 722 flights
- Overnights76% on time · p90 35 min · 85 flights · limited
- Afternoons73% on time · p90 35 min · 760 flights
- Evenings69% on time · p90 55 min · 369 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 86% on time.
- Tuesdays86% on time · p90 15 min · 427 flights
- Saturdays86% on time · p90 20 min · 277 flights
- Mondays84% on time · p90 20 min · 450 flights
- Wednesdays82% on time · p90 30 min · 426 flights
- Thursdays80% on time · p90 25 min · 451 flights
- Sundays79% on time · p90 35 min · 494 flights
- Fridays78% on time · p90 35 min · 449 flights
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