What is the exact bus schedule from Datong to Beijing on a Sunday ?

DT Xinnan Bus Station to Beijing Zhaogongkou Bus Station.
07:10, 07:50, 08:50, 10:10, 11:40, 14:00, 15:20, 16:30
It takes about 4 hours and costs CNY 128.

Thank you so much. So there is no bus after 16:30. Is that the last bus that I can get ? The trains are all full. Any other way to come back from DT on the same day ?

As I know, the last bus to Beijing from Xinnan Bus Station leaves 16:00. Buses back to DT are scheduled from 07:10 to 18:00 and it takes 6 hours. Time is tight to take a round trip between the two cities, so I suggest you go back in the next day.

And if you take a bus at DT Bus Station, buses are scheduled from 07:00 to 21:30.