Historical on-time performance
San Antonio to St. Louis
786 miData through Dec 2025Source: US DOT · BTS
Flights on SAT–STL arrive on time 87% of the time over the last 12 months.
On-time rate87%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 560 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time87%Medianon timep9020 minCancel0.7%Flights560
Why flights run late
Delay causes
- Airline23%
- Weather4%
- Air traffic (NAS)4%
- Late aircraft69%
- 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 SAT → STL
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 68% to 94% on time.
- Mornings94% on time · p90 5 min · 594 flights
- Middays92% on time · p90 5 min · 403 flights
- Afternoons75% on time · p90 30 min · 414 flights
- Evenings68% on time · p90 50 min · 125 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 90% on time.
- Saturdays90% on time · p90 10 min · 156 flights · limited
- Tuesdays90% on time · p90 10 min · 223 flights
- Mondays89% on time · p90 15 min · 241 flights
- Wednesdays86% on time · p90 15 min · 220 flights
- Thursdays84% on time · p90 25 min · 240 flights
- Fridays83% on time · p90 25 min · 243 flights
- Sundays83% on time · p90 40 min · 213 flights
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