The flight from London (LHR) to Dallas-Fort Worth (DFW) takes about 9h 23m nonstop on a widebody airliner, covering 4,739 miles (7,627 km).
Dallas-Fort Worth is 6 hours behind London. You cross 6 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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