How long does it take to get from melbourne australia to vietnam?

It will take between 9 and 15 hours to get from Melbourne to Vietnam. The specific timing required depends on which airport you land in: it will take less time to get from Melbourne to Ho Chi Minh City than it is to Hanoi. It also depends on which airlines you fly with and how many stops you will be making.

For example: Vietnam Airlines flights will take you 8 hours and 45 minutes while Thai Airways will take you 14 hours and 20 minutes to get from Melbourne to Ho Chi Minh City. 

Vietnam Airlines:

Vietnam Airlines offer direct flight from Melbourne to Ho Chi Minh City.

Jetstar:

Jetstar offers the lowest fare from Melbourne to either Hanoi or Ho Chi Minh City, starting at only $450