Which airline is most reliable for DEN (Denver) to SEA (Seattle)?

The most reliable airline on the DEN to SEA route is Delta Air Lines, with an on-time arrival rate of 80%.

How often are flights delayed from DEN to SEA?

About 18% of flights from DEN to SEA experience delays. 82% arrive on time.

What's the average delay on DEN to SEA flights?

When flights from DEN to SEA are delayed, the average delay is approximately 41 minutes.

DEN → SEA

DEN (Denver) to SEA (Seattle)

DEN (Denver) to SEA (Seattle) flights arrive on time 82% of the time. The most reliable airline on this route is Delta Air Lines at 80%. The average delay is 41 minutes. Delays on this route are most often caused by weather.

Source: Bureau of Transportation Statistics. Updated March 2026.

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DEN → SEA on-time performance by month

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This route is on time most of the time. About 82% of flights arrive on schedule.

Delays on this route are most often caused by weather.

Airlines are roughly equal on this route — Delta Air Lines leads slightly at 80% vs JetBlue Airways at 76%.

Airline Comparison

Delta Air Lines leads at 80% on time; JetBlue Airways trails at 76%.

DEN Airport SEA Airport

Check the return: SEA → DEN

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Data last updated March 2026. Source: Bureau of Transportation Statistics.