Seattle to Sitka

What the Data Says About SEA to SIT

The Seattle to Sitka corridor (SEA → SIT) covers roughly 861 miles and is served by 3 carriers, based on Bureau of Transportation Statistics reporting. Across 1,647 flights in the dataset, this route posts a 74.4% on-time rate with an average delay of 57.8 minutes when flights run late. Over the most recent 24 months of BTS data, 1,532 flights were recorded on this pairing — 13 cancelled (0.8%) and 15 diverted (1.0%). Those baseline metrics tell you what to expect before you book.

Having 3 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 1,647 total flights analyzed, the 74.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 57.8-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, Aug 2020 posted the best performance on this corridor at 92% on-time, while Jul 2025 came in at 53% on-time — a 39-point gap between best and worst recent month. For travelers evaluating the SEA to SIT route, the combination of a 74.4% on-time rate, 57.8-minute average delay, 0.8% recent cancellation rate, and 3 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.