British Airways, Qantas Airways, EVA, and Thai Airways fly from LHR to BKK in just over 11 hours, and the return trip takes about 12 hours 45 minutes.
British Airways has a daily flight from Heathrow to Bangkok. It takes around 11 hours and 15 minutes (on a Boeing 747 jet)
Qantas also have a daily flight from Heathrow to Bangkok, which takes the same time to arrive.
Keep up the good work bro.Your article is really great and I truly enjoyed reading it.Waiting for some more great articles like this from you in the coming days.