How do i get from chengdu to Jiuzhaigou?

Well, there are two ways for your choice:
1. By bus: At Chengdu Xinnanmen Bus Station, there are direct buses to JZG Valley. The fare is CNY157 per person and the travel time is around 9h.
2. By air: you may fly to Jiuhuang Airport first. Then transfer to shuttle bus to the scenic area in around 1.5h at a cost of CNY45. By the way, the air ticket fare varies a lot from season to season, so you may try to search the fee online for your travel date.