The flight from Seattle (SEA) to Narita (NRT) takes about 9h 26m nonstop on a widebody airliner, covering 4,757 miles (7,655 km).
Narita is 16 hours ahead of Seattle. You cross 16 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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