You can fly from Shanghai to Amsterdam (Paris), via Lima to La Paz, and take a bus from La Paz to uyuni (or take the train first, which is more comfortable). This is the way to Europe. Of course, you can also fly from Europe to Sao Paulo, Brazil or Caracas, Venezuela to La Paz, mainly by Air France or KLM (that's the flight to that country's capital), while in South America, Taca or Lanci Airlines can do it.

In addition, if you can get a visa from Canada or the United States, you can fly from Shanghai to Canada or the United States. The United States has direct flights to La Paz, or from Sao Paulo and Lima or Caracas to La Paz.

In short, it is to transfer from Europe or North America to three central airports in South America for use by local airlines in South America. The full price of the air ticket is 30,000 in Europe and 25,000 in North America. It's hard to say whether there is any discount.

Air France, Air Canada, Delta and other airlines have offices in Shanghai, which is very convenient.