On Tuesday, the number of international flights, including to Macau, Hong Kong and Taiwan, for this year stood at about 4% of pre-COVID levels, according to consultancy Variflight.
Ticket prices are far above normal. One-way tickets from Singapore to China's business hub of Shanghai cost between 50,000 and 70,000 yuan ($7,460 and $10,590) on China Eastern Airlines for the period between July and September, for example.
"There are very few flights, air ticket prices are sky high.
In fact it is not possible to arrange international group travel," said Zhou Weihong, deputy general manager of Shanghai-based travel agency Spring Tour.