San Diego to Santa Rosa

What the Data Says About SAN to STS

The San Diego to Santa Rosa corridor (SAN → STS) covers roughly 508 miles and is served by 4 carriers, based on Bureau of Transportation Statistics reporting. Across 3,245 flights in the dataset, this route posts a 80.9% on-time rate with an average delay of 57.4 minutes when flights run late. Over the most recent 24 months of BTS data, 1,484 flights were recorded on this pairing — 38 cancelled (2.6%) and 12 diverted (0.8%). Those baseline metrics tell you what to expect before you book.

Having 4 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 3,245 total flights analyzed, the 80.9% 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, May 2025 posted the best performance on this corridor at 84% on-time, while Nov 2024 came in at 53% on-time — a 31-point gap between best and worst recent month. For travelers evaluating the SAN to STS route, the combination of a 80.9% on-time rate, 57.4-minute average delay, 2.6% recent cancellation rate, and 4 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.