Denver to San Diego — airline reliability comparison
Alaska Airlines is the most reliable airline on the DEN to SAN route with a 84% on-time rate, compared to SkyWest Airlines at 72%. Based on 495 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 |
|---|---|---|---|---|
| Alaska AirlinesASBest | 84% | 0.9% | 46m | 495 |
| United AirlinesUA | 80% | 0.9% | 61m | 7,627 |
| Frontier AirlinesF9 | 75% | 1.6% | 64m | 2,970 |
| Southwest AirlinesWN | 72% | 0.9% | 53m | 8,554 |
| SkyWest AirlinesOOWorst | 72% | 1.5% | 42m | 374 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.