If you want a cheap flight from Orkney Island to Shanghai, you've got one airlines to choose from.
Shanghai Pu Dong Airport is just one of the airports in Shanghai. If you're not set on a specific airport, try changing your search from Shanghai Pu Dong Airport to Shanghai to see a broader range of flights – they might be cheaper. It usually takes about 22 hrs 50 mins to fly 8785 km to Shanghai Pu Dong Airport.
There are about one flights to or via Shanghai every week, so you have plenty of options.
If you're planning on going to Shanghai during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.