The flight from Seattle (SEA) to Hong Kong (HKG) takes about 12h 45m nonstop on a widebody airliner, covering 6,488 miles (10,442 km).
Hong Kong is 15 hours ahead of Seattle. You cross 15 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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