Chicago to Los Angeles — airline reliability comparison
United Airlines is the most reliable airline on the ORD to LAX route with a 80% on-time rate, compared to Frontier Airlines at 69%. Based on 11,470 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 | 80% | 1.1% | 69m | 11,470 |
| American AirlinesAA | 75% | 1.1% | 76m | 10,412 |
| Delta Air LinesDL | 74% | 0.0% | 72m | 151 |
| Spirit AirlinesNK | 72% | 1.6% | 75m | 2,135 |
| Frontier AirlinesF9Worst | 69% | 4.3% | 68m | 285 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.