There is no direct flight from India to Ho Chi Minh City. However, one can take a flight to Bangkok and then take a connecting flight to Ho Chi Minh City.
The best way to reach Ho Chi Minh City by flight is to fly into Tan Son Nhat International Airport (SGN).
There is no railroad connection between Hanoi and Ho Chi Minh City. However, there are several trains per day from Hanoi to Dong Hoi, a town on the coast about halfway between the two cities. From Dong Hoi, there are several buses per day to Ho Chi Minh City.
You can reach Ho Chi Minh City by bus from Bangkok, Bangkok Airport, Kuala Lumpur, and Singapore.
There are a number of options for transportation in Ho Chi Minh City, including buses, taxis, and motorbikes.