Are there any bus from Huanglong to Four Maiden's Mountain?

I am sorry that there is no direct bus. You may take a bus to Songpan for about CNY 150 to 200. Next, take a bus to Dujiangyan from Songzhou Passenger Transport Station. The bus departs at 7:20, and the fare is CNY 94. Afterwards, take a bus to Xiaojin. The bus departs at 09:00, and the fare is CNY 88. Upon arrival, take a bus to the mountain.

I am afraid that there is no direct bus to Chongqing. You may take a bus to Xiaojin, and then change to a bus to Chengdu. After that, take a bullet train to Chongqing from Chengdu East Railway Station (about 2 hours). :)