ORD (Chicago) to SEA (Seattle) flights arrive on time 76% of the time. The most reliable airline on this route is Delta Air Lines at 81%. The average delay is 37 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.ORD → SEA
ORD (Chicago) to SEA (Seattle)
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ORD → SEA on-time performance by month
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This route is on time most of the time. About 76% 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 United Airlines at 77%.
Airline Comparison
Delta Air Lines leads at 81% on time; United Airlines trails at 77%.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.