Vietnam has three international airports. These can be found in Ho Chi Minh which is the busiest, Hanoi and Danang, which is the quietest of the three. Most flights to Vietnam arrive from other Asian cities but others come fly in from Australia, America and occasionally Europe.
Vietnam is also accessible on overland routes through Cambodia, Laos and China.
Trains connect the major cities, although they can sometimes be slow. The other option is to use Vietnam’s public buses which also connect all major towns and cities but these can get quite packed sometimes. Private mini-bus companies compete with the public companies and, unfortunately, can get just as packed as the public trains.
If you are in the position where you can splash out, internal flights operate between the airports.