The flight from Dulles (IAD) to Madrid (MAD) takes about 6h 29m nonstop on a widebody airliner, covering 3,806 miles (6,125 km).
Madrid is 6 hours ahead of Dulles. You cross 6 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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