Do I need to go through the immigration formalities to buy a ticket from Singapore to Hong Kong?

According to the latest immigration policies of Singapore and Hong Kong, you need to go through the relevant immigration procedures from Singapore to Hong Kong, as follows:

1. Singapore citizens: Singapore citizens with valid Singapore passports can stay in Hong Kong for 90 days without a visa.

2. Non-Singapore citizens: Passengers holding passports from other countries or regions except Singapore can apply for visas on arrival to stay in Hong Kong for 14 days, and must provide valid travel documents, travel documents, return air tickets and sufficient travel expenses.

3. Other circumstances: According to personal circumstances, such as visa type and travel purpose, additional entry formalities may be required.

In short, if you are from Singapore to Hong Kong and you are not a Singaporean citizen, you need to apply for a visa on arrival. It is recommended that you know and prepare the corresponding procedures and materials in advance before purchasing tickets, so as not to delay the trip.