United Airlines is the most reliable airline on the IAD to SAT route with a 83% on-time rate. Based on 2,327 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to SAT
Washington to San Antonio — airline reliability comparison
On-Time Rate by Airline
United Airlines83%
IAD to SAT Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 83% | 1.1% | 78m | 2,327 |
Route Overview
83%
Overall On-Time
78m
Avg Delay
1%
Cancel Rate
2,327
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.