United Airlines is the most reliable airline on the IAD to AUS route with a 84% on-time rate, compared to at 83%. Based on 3,466 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to AUS
Washington to Austin — airline reliability comparison
On-Time Rate by Airline
United Airlines84%
83%
IAD to AUS Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 84% | 1.0% | 67m | 3,466 |
| MQWorst | 83% | 0.4% | 56m | 208 |
Route Overview
83%
Overall On-Time
69m
Avg Delay
0.9%
Cancel Rate
3,912
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.