United Airlines is the most reliable airline on the IAD to RDU route with a 85% on-time rate, compared to Republic Airways at 81%. Based on 3,131 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to RDU
Washington to Raleigh — airline reliability comparison
On-Time Rate by Airline
United Airlines85%
Republic Airways81%
IAD to RDU Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 85% | 1.1% | 67m | 3,131 |
| Republic AirwaysYXWorst | 81% | 2.7% | 60m | 552 |
Route Overview
84%
Overall On-Time
71m
Avg Delay
1.3%
Cancel Rate
3,729
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.