The flight from Las Vegas (LAS) to New York (JFK) takes about 4h 14m nonstop on a narrowbody airliner, covering 2,243 miles (3,609 km).
New York is 3 hours ahead of Las Vegas. You cross 3 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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