The flight from Paris (Roissy-en-France, Val-d'Oise) (CDG) to San Francisco (SFO) takes about 11h 0m nonstop on a widebody airliner, covering 5,569 miles (8,963 km).
San Francisco is 9 hours behind Paris (Roissy-en-France, Val-d'Oise). You cross 9 time zones heading west. Westbound trips like this one are usually a little easier to adjust to, so plan for a day or two of jet lag.
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