Tour Jiuzhaigou from Xian, what's the best way to do that?

From Xian, you could take a flight to get to Jiuzhaigou directly. However, this airline will be stopped from the mid of Oct. If you miss it, you should take a flight to Chengdu and then transfer to Jiuzhaigou by air or bus. I think you could spend 2~3 days in Xian and the rest days visiting Jiuzhaigou and Chengdu. If this is your first time here, participating a tour group will be more convenient.