The main reasons are as follows:

1.？ Hong Kong is an international metropolis with earlier development in China, with more foreign financial institutions than Guangzhou, more frequent exchanges between Hong Kong people and other international cities, earlier and more mature development of international routes, and more advantages in airline diversity and flight density. Take Emirates as an example. Their flights from Hong Kong to and from the Middle East, Europe and America are far more than those from Guangzhou.

2.？ Except for the relatively few flights from Guangzhou to other cities, most of the take-off and landing periods are not ideal. A few impartial flights in a short period of time are expensive, and it is difficult to meet the needs of passengers 100%. If you take international flights in Guangzhou, it is more suitable to choose short-haul routes, such as Bangkok and Chiang Mai in Southeast Asia or Singapore, Malaysia and Indonesia.

3.？ There are many international flights taking off and landing in Hong Kong, and there are many choices. In addition, Hong Kong's aviation market is more open, there is greater competition among airlines, and air tickets are often discounted. Even at the same time, the same airline, the same model and the same destination travel between Hong Kong and Guangzhou, the price in Hong Kong is usually lower than that in Guangzhou.

4.？ There are many direct flights in Hong Kong, and it has great advantages to fly to the Middle East, Europe, North America, South America, Japan and other relatively distant countries.

Now it is very convenient for mainland residents to travel to and from Hong Kong for customs clearance. In addition, the high-speed train can go directly to Futian, Shenzhen, the EMU can go directly to Luohu, Guangzhou even has a direct train to Kowloon, and there is a direct bus to Hong Kong Airport. Flying abroad via Hong Kong saves time and money.