RDU (Raleigh) to SEA (Seattle) flights arrive on time 80% of the time. The most reliable airline on this route is Delta Air Lines at 88%. The average delay is 52 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated August 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 80% 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 — 88% vs 76% on time.
Airline Comparison
Delta Air Lines leads at 88% on time; Alaska Airlines trails at 76%.
Accurate?
Good to know
Departing from RDU
79% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. RDU has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at SEA
80% 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 ~5 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Delta Air Lines owes you — refund rights, action plan, complaint email. Free.
Flying out of RDU? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated August 2026. Source: Bureau of Transportation Statistics.