Ontario to San Jose

What the Data Says About ONT to SJC

The Ontario to San Jose corridor (ONT → SJC) covers roughly 333 miles and is served by 1 carrier, based on Bureau of Transportation Statistics reporting. Across 7,951 flights in the dataset, this route posts a 86.8% on-time rate with an average delay of 57.4 minutes when flights run late. Over the most recent 24 months of BTS data, 2,701 flights were recorded on this pairing — 5 cancelled (0.2%) and 0 diverted (0.0%). Those baseline metrics tell you what to expect before you book.

Having 1 carrier on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 7,951 total flights analyzed, the 86.8% on-time figure is statistically meaningful rather than a small-sample fluke. The 57.4-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Oct 2024 posted the best performance on this corridor at 97% on-time, while Jul 2025 came in at 77% on-time — a 20-point gap between best and worst recent month. For travelers evaluating the ONT to SJC route, the combination of a 86.8% on-time rate, 57.4-minute average delay, 0.2% recent cancellation rate, and 1 available carrier is the concrete summary of what BTS data shows about reliability on this pairing.