Raleigh to Denver — airline reliability comparison
United Airlines is the most reliable airline on the RDU to DEN route with a 85% on-time rate, compared to Frontier Airlines at 77%. Based on 3,005 flights tracked.
This route involves weather-prone airports and high-congestion airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 85% | 0.8% | 80m | 3,005 |
| Southwest AirlinesWN | 79% | 0.6% | 53m | 2,412 |
| Frontier AirlinesF9Worst | 77% | 1.4% | 99m | 1,376 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.