How often are DEN to SEA flights on time?

Flights from Denver (DEN) to Seattle (SEA) arrive on time 82% of the time across 39,417 flights of official data.

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

Delta Air Lines has the best on-time record on this route at 86% across 7,038 flights.

Route reliability

Flights from Denver to Seattle arrive on time 82% of the time across 39,417 flights. Here’s how each airline really performs.

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On-time rate

39,417 flights

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

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Nonstop vs. Connecting Flights: The Reliability Trade-off

A stop multiplies the ways a trip can break. When it's worth it — and how to de-risk it.

Do Morning Flights Really Have Fewer Delays?

Yes — and there's a clear reason. How delays snowball through the day.

Are Some Airlines Really More Reliable Than Others?

The reliability gap between airlines is real — here's what actually drives it.

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