San Francisco to San Diego — airline reliability comparison
Alaska Airlines is the most reliable airline on the SFO to SAN route with a 87% on-time rate, compared to Frontier Airlines at 57%. Based on 895 flights tracked.
This route involves 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 | 87% | 0.4% | 53m | 895 |
| United AirlinesUA | 81% | 1.1% | 60m | 8,233 |
| SkyWest AirlinesOO | 71% | 1.4% | 56m | 7,095 |
| Southwest AirlinesWN | 63% | 0.9% | 56m | 6,018 |
| Frontier AirlinesF9Worst | 57% | 3.4% | 66m | 702 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.