Historical on-time performance
St. Louis to San Antonio
786 miData through Dec 2025Source: US DOT · BTS
Flights on STL–SAT arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 559 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time79%Medianon timep9040 minCancel1.1%Flights559
Why flights run late
Delay causes
- Airline30%
- Weather1%
- Air traffic (NAS)12%
- Late aircraft58%
- 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 STL → SAT
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 66% to 88% on time.
- Mornings88% on time · p90 15 min · 172 flights · limited
- Middays86% on time · p90 20 min · 536 flights
- Afternoons75% on time · p90 35 min · 314 flights
- Overnights75% on time · p90 45 min · 292 flights
- Evenings66% on time · p90 75 min · 226 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 83% on time.
- Fridays83% on time · p90 30 min · 243 flights
- Mondays81% on time · p90 35 min · 241 flights
- Wednesdays80% on time · p90 30 min · 220 flights
- Tuesdays79% on time · p90 35 min · 223 flights
- Sundays78% on time · p90 30 min · 218 flights
- Saturdays75% on time · p90 50 min · 155 flights · limited
- Thursdays74% on time · p90 35 min · 240 flights
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