RDU (Raleigh) to SEA (Seattle) flights arrive on time 81% of the time. The most reliable airline on this route is Delta Air Lines at 90%. The average delay is 53 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.RDU → SEA
RDU (Raleigh) to SEA (Seattle)
RDU → SEA 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).
Accurate?
Delta Air Lines edges out Alaska Airlines on this route — 90% vs 77% on time.
Airline Comparison
Delta Air Lines leads at 90% on time; Alaska Airlines trails at 77%.
Accurate?
Good to know
Departing from RDU
80% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. RDU has long runway queues.
TSA is currently ~14 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 ~10 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.