I'ts highly recommended to either get to Hue, or leave, via car through the Hai Van Pass to the south, to Danang.
Planes
Hue's airport provides only domestic service by Vietnam Airlines, to Hanoi and Ho Chi Minh City.
Trains
Hue is on the main north-south line connecting Hanoi with Ho Chi Minh city. Express trains from Danang take about 3 1/2 hours, and the view by train is almost as spectacular as the drive. There are several long tunnels along the route, so travelers are advised to keep track of their valuables in the dark.
Automobiles
The trip south from Hue through the Hai Van Pass has to be one of the most scenic trips in Southeast Asia. From Hue, you first pass through rice fields still dotted with guard towers from the war, then you begin to travel up through hills and several connected bays until you reach the pass, from which you then descend down into Danang.
Renting a car with driver is quite inexpensive and can usually be booked through a local travel agent.