The flight from Bangkok (BKK) to Dallas-Fort Worth (DFW) takes about 15h 49m nonstop on a widebody airliner, covering 9,011 miles (14,502 km).
Dallas-Fort Worth is 12 hours behind Bangkok. You cross 12 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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