Chicago is 14 hours behind Seoul.
Time difference
Seoul is 14 to 15 hours ahead of Chicago, depending on daylight saving time. The gap changes by an hour when Chicago shifts its clocks for daylight saving time; Seoul stays on the same offset year-round.
Working hours
A standard 9-to-6 workday in Chicago does not overlap with Seoul. The least disruptive time to connect is around 18:30 in Chicago, which is 08:30 in Seoul.
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