Helena to Seattle

What the Data Says About HLN to SEA

The Helena to Seattle corridor (HLN → SEA) covers roughly 491 miles and is served by 2 carriers, based on Bureau of Transportation Statistics reporting. Across 677 flights in the dataset, this route posts a 84.8% on-time rate with an average delay of 69.0 minutes when flights run late. Over the most recent 24 months of BTS data, 677 flights were recorded on this pairing — 9 cancelled (1.3%) 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 677 total flights analyzed, the 84.8% on-time figure is statistically meaningful rather than a small-sample fluke. The 69.0-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 HLN to SEA route, the combination of a 84.8% on-time rate, 69.0-minute average delay, 1.3% recent cancellation rate, and 2 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.