Sacramento to Seattle

What the Data Says About SMF to SEA

The Sacramento to Seattle corridor (SMF → SEA) covers roughly 605 miles and is served by 23 carriers, based on Bureau of Transportation Statistics reporting. Across 24,243 flights in the dataset, this route posts a 85.2% on-time rate with an average delay of 58.8 minutes when flights run late. Over the most recent 24 months of BTS data, 8,423 flights were recorded on this pairing — 33 cancelled (0.4%) and 16 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 23 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 24,243 total flights analyzed, the 85.2% on-time figure is statistically meaningful rather than a small-sample fluke. The 58.8-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, Feb 2024 posted the best performance on this corridor at 94% on-time, while Jun 2025 came in at 73% on-time — a 21-point gap between best and worst recent month. For travelers evaluating the SMF to SEA route, the combination of a 85.2% on-time rate, 58.8-minute average delay, 0.4% recent cancellation rate, and 23 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.