How often are SEA to SLC flights on time?

Flights from Seattle (SEA) to Salt Lake City (SLC) arrive on time 88% of the time across 24,601 flights of official data.

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

Delta Air Lines has the best on-time record on this route at 91% across 14,073 flights.

Route reliability

Flights from Seattle to Salt Lake City arrive on time 88% of the time across 24,601 flights. Here’s how each airline really performs.

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On-time rate

24,601 flights

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

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Are Some Airlines Really More Reliable Than Others?

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