United Airlines is the most reliable airline on the IAD to PIT route with a 87% on-time rate, compared to Republic Airways at 86%. Based on 592 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to PIT
Washington to Pittsburgh — airline reliability comparison
On-Time Rate by Airline
United Airlines87%
Republic Airways86%
IAD to PIT Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 87% | 1.2% | 66m | 592 |
| Republic AirwaysYXWorst | 86% | 1.4% | 61m | 2,697 |
Route Overview
86%
Overall On-Time
65m
Avg Delay
1.3%
Cancel Rate
3,311
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.