Great Falls to Seattle

What the Data Says About GTF to SEA

The Great Falls to Seattle corridor (GTF → SEA) covers roughly 512 miles and is served by 2 carriers, based on Bureau of Transportation Statistics reporting. Across 1,214 flights in the dataset, this route posts a 85.7% on-time rate with an average delay of 58.2 minutes when flights run late. Over the most recent 24 months of BTS data, 770 flights were recorded on this pairing — 3 cancelled (0.4%) and 2 diverted (0.3%). 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 1,214 total flights analyzed, the 85.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 58.2-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).

Monthly performance varies, so review the monthly table above to see specific periods. For travelers evaluating the GTF to SEA route, the combination of a 85.7% on-time rate, 58.2-minute average delay, 0.4% recent cancellation rate, and 2 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.