I have posted elsewhere on this subject but though maybe this might help.
Posting on the Hue Forum.
Options for getting to Hue from Hanoi seem poor.
Flights appear to be sold out or if not extremely expensive. The alternative by train is a long arduous overnight taking 16 hours. Can anyone suggest how they would travel to and from Hue? What other options are there. We will have come to Vietnam from China after days of train travel and were hoping to avoid any more. What about coaches? Are they comfortable and how quick and safe are they? I have travelled a lot on Vietnamese roads and must say I do not favour this option.