Santa Rosa to San Diego

What the Data Says About STS to SAN

The Santa Rosa to San Diego corridor (STS → SAN) covers roughly 508 miles and is served by 5 carriers, based on Bureau of Transportation Statistics reporting. Across 3,163 flights in the dataset, this route posts a 77.9% on-time rate with an average delay of 62.1 minutes when flights run late. Over the most recent 24 months of BTS data, 1,484 flights were recorded on this pairing — 36 cancelled (2.4%) and 7 diverted (0.5%). Those baseline metrics tell you what to expect before you book.

Having 5 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 3,163 total flights analyzed, the 77.9% on-time figure is statistically meaningful rather than a small-sample fluke. The 62.1-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, Jul 2025 posted the best performance on this corridor at 85% on-time, while Nov 2024 came in at 48% on-time — a 37-point gap between best and worst recent month. For travelers evaluating the STS to SAN route, the combination of a 77.9% on-time rate, 62.1-minute average delay, 2.4% recent cancellation rate, and 5 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.