San Diego to Chicago — airline reliability comparison
United Airlines is the most reliable airline on the SAN to ORD route with a 86% on-time rate, compared to Frontier Airlines at 29%. Based on 6,003 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 | 86% | 0.8% | 77m | 6,003 |
| American AirlinesAA | 83% | 1.3% | 109m | 4,289 |
| Alaska AirlinesAS | 74% | 2.1% | 62m | 777 |
| Frontier AirlinesF9Worst | 29% | 3.1% | 155m | 75 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.