The flight from Bangkok (BKK) to Dulles (IAD) takes about 16h 42m nonstop on a widebody airliner, covering 8,799 miles (14,160 km).
Dulles is 11 hours behind Bangkok. You cross 11 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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