San Jose to Ontario

What the Data Says About SJC to ONT

The San Jose to Ontario corridor (SJC → ONT) covers roughly 333 miles and is served by 1 carrier, based on Bureau of Transportation Statistics reporting. Across 7,922 flights in the dataset, this route posts a 85.6% on-time rate with an average delay of 55.4 minutes when flights run late. Over the most recent 24 months of BTS data, 2,692 flights were recorded on this pairing — 7 cancelled (0.3%) and 3 diverted (0.1%). 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 7,922 total flights analyzed, the 85.6% on-time figure is statistically meaningful rather than a small-sample fluke. The 55.4-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, Nov 2024 posted the best performance on this corridor at 94% on-time, while Oct 2025 came in at 72% on-time — a 22-point gap between best and worst recent month. For travelers evaluating the SJC to ONT route, the combination of a 85.6% on-time rate, 55.4-minute average delay, 0.3% recent cancellation rate, and 1 available carrier is the concrete summary of what BTS data shows about reliability on this pairing.