The flight from Los Angeles (LAX) to Philadelphia (PHL) takes about 4h 30m nonstop on a narrowbody airliner, covering 2,396 miles (3,856 km).
Philadelphia is 3 hours ahead of Los Angeles. 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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