SEA (Seattle) to RDU (Raleigh) flights arrive on time 79% of the time. The most reliable airline on this route is Delta Air Lines at 83%. The average delay is 41 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 → RDU
SEA (Seattle) to RDU (Raleigh)
SEA → RDU on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 79% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Airlines are roughly equal on this route — Delta Air Lines leads slightly at 83% vs Alaska Airlines at 79%.
Airline Comparison
Delta Air Lines leads at 83% on time; Alaska Airlines trails at 79%.
Accurate?
Good to know
Departing from SEA
82% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~10 min. Best time: 4 AM (about 5 min).
Arriving at RDU
80% on timeWhen flights into RDU are late, the average delay is 72 minutes. Build buffer if you have ground plans.
If connecting at RDU: TSA is ~14 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.