Does Datong in Shanxi go directly to Huai 'an? If so, how long will it take by car? how much is it?

There is no direct flight! You can choose to transfer from Beijing or Taiyuan, Datong to Beijing is 56, Beijing to Huai 'an is 137, (hard seat), you can also take the train to Taiyuan in the morning, and there is a bus from Taiyuan to Huai 'an in the afternoon. The hard seat fare is about 180! It takes about 16 hours to transfer from Beijing and more than 20 hours to transfer from Taiyuan! I suggest you transfer from Beijing.