The flight from Los Angeles (LAX) to Beijing (PEK) takes about 12h 18m nonstop on a widebody airliner, covering 6,237 miles (10,037 km).
Beijing is 15 hours ahead of Los Angeles. 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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