The flight from Zurich (ZRH) to Seoul (ICN) takes about 9h 9m nonstop on a widebody airliner, covering 5,433 miles (8,744 km).
Seoul is 7 hours ahead of Zurich. You cross 7 time zones heading east. Eastbound trips like this one tend to be harder to adjust to, so plan for a day or two of jet lag.
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