Spokane to Seattle

What the Data Says About GEG to SEA

The Spokane to Seattle corridor (GEG → SEA) covers roughly 224 miles and is served by 20 carriers, based on Bureau of Transportation Statistics reporting. Across 31,745 flights in the dataset, this route posts a 86.5% on-time rate with an average delay of 65.3 minutes when flights run late. Over the most recent 24 months of BTS data, 10,470 flights were recorded on this pairing — 70 cancelled (0.7%) and 7 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 20 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 31,745 total flights analyzed, the 86.5% on-time figure is statistically meaningful rather than a small-sample fluke. The 65.3-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, Apr 2024 posted the best performance on this corridor at 91% on-time, while Feb 2025 came in at 71% on-time — a 20-point gap between best and worst recent month. For travelers evaluating the GEG to SEA route, the combination of a 86.5% on-time rate, 65.3-minute average delay, 0.7% recent cancellation rate, and 20 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.