flight distance between guangzhou & beijin & GZ & shanghai

It is aeound 1,967km between GZ and Beijing by air and the flight distance from Shanghai is about 1,308km.

Here is the map of whole China. Hope help:
https://www.travelchinaguide.com/map/

I searched that there are flights flying from Frankfut to Shanghai Pudong Airport or Beijing Capital Airport daily. About the specific dates according to your requirements, I suggest you find at the official website of Luftansa Airline.