United Airlines is the most reliable airline on the SAT to IAD route with a 91% on-time rate. Based on 2,327 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SAT to IAD
San Antonio to Washington — airline reliability comparison
On-Time Rate by Airline
United Airlines91%
SAT to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 91% | 1.1% | 71m | 2,327 |
Route Overview
92%
Overall On-Time
72m
Avg Delay
1.1%
Cancel Rate
2,327
Total Flights
Flying out of SAT? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.