Based on flight volume data, Osaka Kansai Intl is the most popular airport that HK Express uses. Hong Kong Intl and Bangkok Suvarnabhumi are the next two most visited by HK Express.
The least expensive round-trip HK Express international flight we could find is flying from Hong Kong Intl to Fukuoka. This trip has 0 stops) and costs just 3,334,899 ₫ per ticket. HK Express has international one-way flights available, but the cheapest is a flight from Bangkok Suvarnabhumi to Hong Kong Intl for just 1,596,994 ₫. This flight has 0 stops.
HK Express does not have flights from Ho Chi Minh City - you will need to fly out of Da Nang instead. However, you could fly from Ho Chi Minh City with Emirates or another airline.