London to Santiago de Chile Nonstop
British Airways http://www.britishairways.com has announced that it will soon have an even longer nonstop than its current champion, London to Buenos Aires. That flight takes 13 hours and 50 minutes, while the new flight to Santiago will take 14 hours and 40 minutes.
I'm no fan of long flights, but if you need or want to go somewhere far away sometimes they can be more relaxing than the hassle of transferring at an intermediate airport. The longest flight I ever took was New York to Johannesburg on South African Airways, which was 14 hours at that time.
Santiago is one of the many South American cities I would like to visit, so if I lived in Britain I would definitely consider this option.