9-10 hrs according to this:
http://travel.aol.co.uk/flight-duration/article/20060720054209990001
Baltimore, MD (BWI) to London (LON)Shortest Flight Duration 7 hours 20 mins
A flight from London, England to Hawaii, United States will have an estimated flight time of 14 to 15 hours.
I taks about 14 hours to come from London, England to Natal, Brazil (changing flights at Lisbon, Portugal)
Raleigh/Durham, NC (RDU) to London (LON)Shortest Flight Duration 7 hours 25 mins
London (LON) to Sydney (SYD)Flight Duration 21 hours 35 mins
The distance from Port Louis, Mauritius to London, England is 9712 kilometers. A nonstop flight takes on average, 12 hours, 32 minutes.
Flight duration approx 20hr
Toronto, ON (YTO) to London (LON) Shortest Flight Duration 7 hours 4 mins
A non-stop flight from Kuwait City, Kuwait to London, England on British Airways has a duration of 6 hours and 50 minutes. Flights that have one or two stops have a duration of 12 to 20 hours.
Around 13 hours or so, see:http://www.flightsite.org/flights/london-england-to-phuket-phuket/12008-13414/
The air distance from London, England, to Krabi, Thailand, is 6,171 miles. That equals 9,932 kilometers or 5,363 nautical miles.
The duration of a flight from New York to London is typically around 7 to 8 hours.