San Luis Obispo to Seattle

What the Data Says About SBP to SEA

The San Luis Obispo to Seattle corridor (SBP → SEA) covers roughly 847 miles and is served by 6 carriers, based on Bureau of Transportation Statistics reporting. Across 2,043 flights in the dataset, this route posts a 85% on-time rate with an average delay of 66.9 minutes when flights run late. Over the most recent 24 months of BTS data, 836 flights were recorded on this pairing — 6 cancelled (0.7%) and 3 diverted (0.4%). Those baseline metrics tell you what to expect before you book.

Having 6 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,043 total flights analyzed, the 85% on-time figure is statistically meaningful rather than a small-sample fluke. The 66.9-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 2024 posted the best performance on this corridor at 87% on-time, while Aug 2024 came in at 75% on-time — a 12-point gap between best and worst recent month. For travelers evaluating the SBP to SEA route, the combination of a 85% on-time rate, 66.9-minute average delay, 0.7% recent cancellation rate, and 6 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.