Jacksonville to Denver — airline reliability comparison
Frontier Airlines is the most reliable airline on the JAX to DEN route with a 89% on-time rate, compared to Southwest Airlines at 78%. Based on 54 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 |
|---|---|---|---|---|
| Frontier AirlinesF9Best | 89% | 1.7% | 71m | 54 |
| United AirlinesUA | 86% | 0.5% | 86m | 1,884 |
| Southwest AirlinesWNWorst | 78% | 0.7% | 53m | 1,192 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.