SEA (Seattle) to MDW (Chicago) flights arrive on time 79% of the time. The most reliable airline on this route is Southwest Airlines at 85%. 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 March 2026.SEA → MDW
SEA (Seattle) to MDW (Chicago)
SEA → MDW on-time performance by month
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This route is on time most of the time. About 79% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
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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 ~10 min. Best time: 4 AM (about 5 min).
Arriving at MDW
78% on timeWhen flights into MDW are late, the average delay is 56 minutes. Build buffer if you have ground plans.
If connecting at MDW: TSA is ~16 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.