Southwest Airlines is the most reliable airline on the STL to SAT route with a 81% on-time rate. Based on 1,868 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to SAT
St. Louis to San Antonio — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines81%
STL to SAT Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 81% | 0.4% | 52m | 1,868 |
Route Overview
81%
Overall On-Time
53m
Avg Delay
0.4%
Cancel Rate
1,868
Total Flights
Flying out of STL? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.