The flight from San Francisco (SFO) to Sepang (KUL) takes about 15h 18m nonstop on a widebody airliner, covering 8,472 miles (13,635 km).
Sepang is 15 hours ahead of San Francisco. 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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