Seattle to Idaho Falls

What the Data Says About SEA to IDA

The Seattle to Idaho Falls corridor (SEA → IDA) covers roughly 566 miles and is served by 2 carriers, based on Bureau of Transportation Statistics reporting. Across 602 flights in the dataset, this route posts a 77.1% on-time rate with an average delay of 54.9 minutes when flights run late. Over the most recent 24 months of BTS data, 602 flights were recorded on this pairing — 6 cancelled (1.0%) and 4 diverted (0.7%). 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 602 total flights analyzed, the 77.1% on-time figure is statistically meaningful rather than a small-sample fluke. The 54.9-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, Nov 2025 posted the best performance on this corridor at 86% on-time, while Dec 2025 came in at 71% on-time — a 15-point gap between best and worst recent month. For travelers evaluating the SEA to IDA route, the combination of a 77.1% on-time rate, 54.9-minute average delay, 1.0% recent cancellation rate, and 2 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.