PDX (Portland) to SEA (Seattle) flights arrive on time 86% of the time. The most reliable airline on this route is Delta Air Lines at 93%. The average delay is 60 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated April 2026.PDX → SEA
PDX (Portland) to SEA (Seattle)
PDX → SEA on-time performance by month
24
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is usually on time. About 86% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Delta Air Lines edges out Alaska Airlines on this route — 93% vs 84% on time.
Airline Comparison
Delta Air Lines leads at 93% on time; Alaska Airlines trails at 84%.
Accurate?
Good to know
Departing from PDX
83% on timeExpect ~16 min sitting on the taxiway after your gate pushes back. PDX has long runway queues.
TSA is currently ~15 min. Best time: 4 AM (about 5 min).
Arriving at SEA
82% on timeWhen flights into SEA are late, the average delay is 57 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~22 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated April 2026. Source: Bureau of Transportation Statistics.