Walla Walla to Seattle

What the Data Says About ALW to SEA

The Walla Walla to Seattle corridor (ALW → SEA) covers roughly 213 miles and is served by 2 carriers, based on Bureau of Transportation Statistics reporting. Across 2,217 flights in the dataset, this route posts a 88.5% on-time rate with an average delay of 67.6 minutes when flights run late. Over the most recent 24 months of BTS data, 1,278 flights were recorded on this pairing — 41 cancelled (3.2%) and 1 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 2 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,217 total flights analyzed, the 88.5% on-time figure is statistically meaningful rather than a small-sample fluke. The 67.6-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, May 2024 posted the best performance on this corridor at 97% on-time, while Jan 2024 came in at 76% on-time — a 21-point gap between best and worst recent month. For travelers evaluating the ALW to SEA route, the combination of a 88.5% on-time rate, 67.6-minute average delay, 3.2% recent cancellation rate, and 2 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.