The flight from Sydney (Mascot) (SYD) to Las Vegas (LAS) takes about 13h 52m nonstop on a widebody airliner, covering 7,727 miles (12,435 km).
Las Vegas is 17 hours behind Sydney (Mascot). You cross 17 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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