San Jose to Denver — airline reliability comparison
United Airlines is the most reliable airline on the SJC to DEN route with a 89% on-time rate, compared to Frontier Airlines at 75%. Based on 4,090 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 | 89% | 0.8% | 71m | 4,090 |
| SkyWest AirlinesOO | 82% | 1.5% | 80m | 122 |
| Southwest AirlinesWN | 80% | 0.6% | 52m | 5,758 |
| Frontier AirlinesF9Worst | 75% | 0.5% | 66m | 241 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.