Shanghai Pu Dong airport offers the cheapest routes to Bangkok, from ฿9,470; whereas Shanghai Hongqiao Intl airport is typically cheaper if you're flying to Bangkok, from ฿9,470. It's best to make sure you are flexible on dates to find the cheapest possible flight options for your journey.
Here are some of the cheapest flight destinations from China:
Fly from Shanghai to Phuket City from ฿9,470
Fly from Shanghai to Bangkok from ฿10,074