The flight from Philadelphia (PHL) to Narita (NRT) takes about 13h 16m nonstop on a widebody airliner, covering 6,740 miles (10,847 km).
Narita is 13 hours ahead of Philadelphia. You cross 13 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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