How often are SEA to BOI flights on time?

Flights from Seattle (SEA) to Boise (BOI) arrive on time 89% of the time across 34,589 flights of official data.

Which airline is most reliable on the SEA to BOI route?

Delta Air Lines has the best on-time record on this route at 93% across 14,094 flights.

Route reliability

Flights from Seattle to Boise arrive on time 89% of the time across 34,589 flights. Here’s how each airline really performs.

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On-time rate

34,589 flights

Airline	On-time	Flights
Delta Air Lines	93%	14,094
Alaska Airlines	87%	20,495

On-time = arrived within 15 minutes of schedule, per BTS TranStats. Compare the reverse leg BOI → SEA.

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Score real SEA–BOI flights on reliability, weather, and connection safety — not just price.

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