Sitka to Seattle

What the Data Says About SIT to SEA

The Sitka to Seattle corridor (SIT → SEA) covers roughly 861 miles and is served by 3 carriers, based on Bureau of Transportation Statistics reporting. Across 1,678 flights in the dataset, this route posts a 78.8% on-time rate with an average delay of 75.4 minutes when flights run late. Over the most recent 24 months of BTS data, 1,564 flights were recorded on this pairing — 17 cancelled (1.1%) and 2 diverted (0.1%). 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 1,678 total flights analyzed, the 78.8% on-time figure is statistically meaningful rather than a small-sample fluke. The 75.4-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, Aug 2020 posted the best performance on this corridor at 92% on-time, while Jul 2025 came in at 61% on-time — a 31-point gap between best and worst recent month. For travelers evaluating the SIT to SEA route, the combination of a 78.8% on-time rate, 75.4-minute average delay, 1.1% recent cancellation rate, and 3 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.