United Airlines is the most reliable airline on the RDU to IAD route with a 88% on-time rate, compared to Republic Airways at 85%. Based on 3,125 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: RDU to IAD
Raleigh to Washington — airline reliability comparison
On-Time Rate by Airline
United Airlines88%
Republic Airways85%
RDU to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 88% | 1.2% | 82m | 3,125 |
| Republic AirwaysYXWorst | 85% | 2.2% | 71m | 552 |
Route Overview
87%
Overall On-Time
81m
Avg Delay
1.3%
Cancel Rate
3,724
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.