Seattle to Anchorage

What the Data Says About SEA to ANC

The Seattle to Anchorage corridor (SEA → ANC) covers roughly 1,448 miles and is served by 10 carriers, based on Bureau of Transportation Statistics reporting. Across 41,143 flights in the dataset, this route posts a 77.5% on-time rate with an average delay of 50.0 minutes when flights run late. Over the most recent 24 months of BTS data, 14,469 flights were recorded on this pairing — 140 cancelled (1.0%) and 13 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 10 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 41,143 total flights analyzed, the 77.5% on-time figure is statistically meaningful rather than a small-sample fluke. The 50.0-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, Sep 2025 posted the best performance on this corridor at 88% on-time, while Dec 2025 came in at 55% on-time — a 33-point gap between best and worst recent month. For travelers evaluating the SEA to ANC route, the combination of a 77.5% on-time rate, 50.0-minute average delay, 1.0% recent cancellation rate, and 10 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.