How to go by subway from Chongqing Jiangbei Airport to Carlton Hotel? Any day pass?

From the airport, you can take metro line 3 to get to Lianglukou Station, Exit 7. Then transfer to bus no.118 to arrive at Keyuan 4th Road Intersection. Afterwards, walk north along Keyuan 4th Road around 150 yards to arrive at the destination.
In addition, you can buy the One-day Travel Pass. The ticket fare is CNY 18 per person. With this pass, passenger could take all the city's subway lines without limit in 24 hours after the first use.
Hope helpful!