Seek the cheapest route from Changchun to Hong Kong.

Fly from Changchun to Shenzhen, then pass through Shenzhen, and then take the East Rail (that is, the train, which connects with the subway line in Hong Kong) to Hong Kong. Of course, you can also go to Hong Kong through Guangzhou, but my route is Shenzhen-Hong Kong-Macau-Zhuhai-Guangzhou. Just one lap. If you go to Hong Kong, go to Macau. It's convenient to take the new ferry.