SEA (Seattle) to CHS (Charleston) flights arrive on time 81% of the time. The most reliable airline on this route is Alaska Airlines at 81%. 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 May 2026.SEA → CHS
SEA (Seattle) to CHS (Charleston)
SEA → CHS on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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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?
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 CHS
80% on timeWhen flights into CHS are late, the average delay is 70 minutes. Build buffer if you have ground plans.
If connecting at CHS: TSA is ~23 min right now. Allow at least 60 minutes for a domestic connection.
CHS has a 2.1% cancellation rate — keep the airline app handy for rebooking.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.