Direct flights departing from London to Las Vegas take 10 to 11 hours to reach their destination. This assumes that the plane flies at a fairly consistent speed of 500 mph and that takeoff and landing add roughly 30 minutes to the overall flight time.
Finnair, British Airways, and American Airlines offer nonstop flights from London to Las Vegas. American Airways, US Airways, United, Delta, Lufthansa and a few other airlines offer flights with one or two stops. One or multi-stop flights normally lay over in a major city, such as Dallas, New York City, Atlanta or Miami, and it can take travelers up to 26 hours to reach their final destinations.