SEA (Seattle) to BWI (Baltimore) flights arrive on time 78% of the time. The most reliable airline on this route is Alaska Airlines at 78%. The average delay is 40 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.SEA → BWI
SEA (Seattle) to BWI (Baltimore)
SEA → BWI on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 78% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — Alaska Airlines leads slightly at 78% vs Southwest Airlines at 77%.
Airline Comparison
Alaska Airlines leads at 78% on time; Southwest Airlines trails at 77%.
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 ~15 min. Best time: 4 AM (about 5 min).
Arriving at BWI
78% on timeWhen flights into BWI are late, the average delay is 58 minutes. Build buffer if you have ground plans.
If connecting at BWI: TSA is ~23 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.