Southwest Airlines is the most reliable airline on the ONT to SJC route with a 87% on-time rate. Based on 4,987 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: ONT to SJC
Ontario to San Jose — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines87%
ONT to SJC Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 87% | 0.3% | 55m | 4,987 |
Route Overview
87%
Overall On-Time
55m
Avg Delay
0.3%
Cancel Rate
4,987
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.