San Diego to San Francisco — airline reliability comparison
United Airlines is the most reliable airline on the SAN to SFO route with a 75% on-time rate, compared to Frontier Airlines at 52%. Based on 8,235 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 |
|---|---|---|---|---|
| United AirlinesUABest | 75% | 1.2% | 61m | 8,235 |
| SkyWest AirlinesOO | 69% | 1.2% | 60m | 7,155 |
| Southwest AirlinesWN | 62% | 0.9% | 57m | 6,011 |
| Alaska AirlinesAS | 53% | 0.7% | 52m | 896 |
| Frontier AirlinesF9Worst | 52% | 4.7% | 69m | 702 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.