Seattle to Juneau

What the Data Says About SEA to JNU

The Seattle to Juneau corridor (SEA → JNU) covers roughly 909 miles and is served by 3 carriers, based on Bureau of Transportation Statistics reporting. Across 8,680 flights in the dataset, this route posts a 78.7% on-time rate with an average delay of 51.4 minutes when flights run late. Over the most recent 24 months of BTS data, 3,191 flights were recorded on this pairing — 39 cancelled (1.2%) and 10 diverted (0.3%). 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 8,680 total flights analyzed, the 78.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 51.4-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, Mar 2025 posted the best performance on this corridor at 88% on-time, while Jul 2024 came in at 58% on-time — a 30-point gap between best and worst recent month. For travelers evaluating the SEA to JNU route, the combination of a 78.7% on-time rate, 51.4-minute average delay, 1.2% recent cancellation rate, and 3 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.