United Airlines is the most reliable airline on the IAD to BUF route with a 96% on-time rate, compared to Republic Airways at 82%. Based on 26 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to BUF
Washington to Buffalo — airline reliability comparison
On-Time Rate by Airline
United Airlines96%
Republic Airways82%
IAD to BUF Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 96% | 0.0% | 18m | 26 |
| Republic AirwaysYXWorst | 82% | 3.4% | 82m | 361 |
Route Overview
83%
Overall On-Time
84m
Avg Delay
3.5%
Cancel Rate
396
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.