Guiyang to Chengdu by bus

Well, there is only one direct long-distance bus scheduled at 09:00 from Main Bus Station. The ticket fare is CNY 230 per person. It takes around 10 hours on the way.

Or you can take the train from Main Railway Station and arrive at the destination directly. The train schedules are 07:47, 11:23, 13:50, 14:38, 14:47, 18:08, 20:02 and 20:33. The duration is 18 to 20 hours. The ticket fare of soft sleeper is CNY363.5 and hard sleeper is CNY237.5.
You can choose the way you like.

Thank you Cathy. I believe it is the same Bus Station that is close to SITC.

Yes, the bus departs from Jinyang Passenger Transport Station beside Southwest International Trade City, West Shangchang Road, Guanshanhu District.

Great and Thank you again. I got in touch with them, well to add more info

Current fare is 360 Y per person, and you can book 48 hours in advance prior to departure of the bus.