Based on flight volume data, Bangkok Suvarnabhumi is the most popular airport that Hong Kong Airlines uses. Hong Kong Intl and Tokyo Narita are the next two most visited by Hong Kong Airlines.
The least expensive round-trip Hong Kong Airlines international flight we could find is flying from Hong Kong Intl to Nanjing Lukou Intl. This trip has 0 stops) and costs just 2,019,253 ₫ per ticket. Hong Kong Airlines has international one-way flights available, but the cheapest is a flight from Manila Ninoy Aquino Intl to Hong Kong Intl for just 1,314,863 ₫. This flight has 0 stops.
Hong Kong Airlines does not have flights from Ho Chi Minh City - you will need to fly out of Bangkok Suvarnabhumi instead. However, you could fly from Ho Chi Minh City with Ethiopian Air or another airline.