DCA (Washington) to SEA (Seattle) flights arrive on time 82% of the time. The most reliable airline on this route is Alaska Airlines at 83%. The average delay is 77 minutes. Delays on this route are most often caused by air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated March 2026.DCA → SEA
DCA (Washington) to SEA (Seattle)
DCA → SEA on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 82% of flights arrive on schedule.
Delays on this route are most often caused by air traffic and busy airspace.
Accurate?
Alaska Airlines edges out Delta Air Lines on this route — 83% vs 75% on time.
Airline Comparison
Alaska Airlines leads at 83% on time; Delta Air Lines trails at 75%.
Accurate?
Good to know
Departing from DCA
79% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. DCA has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
DCA cancels 2.6% of flights — higher than average. Have a backup plan.
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 ~5 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
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Data last updated March 2026. Source: Bureau of Transportation Statistics.