SEA (Seattle) to DEN (Denver) flights arrive on time 81% of the time. The most reliable airline on this route is Delta Air Lines at 81%. The average delay is 46 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.SEA → DEN
SEA (Seattle) to DEN (Denver)
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SEA → DEN on-time performance by month
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This route is on time most of the time. About 81% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Airlines are roughly equal on this route — Delta Air Lines leads slightly at 81% vs Alaska Airlines at 79%.
Airline Comparison
Delta Air Lines leads at 81% on time; Alaska Airlines trails at 79%.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.