Hi, there are no direct flights but only conjoint flights with transfers at Beijing, Shenzhen, Guangzhou or Inchon available from Kuala Lumpur to Nanjing. Per your request, the following flight schedule is for your reference.

1)
Kuala Lumpur-Beijing, 0020/0630, CA972, Air China
Beijing-Nanjing, 1030/1210, MU2802, China Eastern Airlines
2)
Kuala Lumpur-Beijing, 0030/0630, MH370, Malaysia Airlines
Beijing-Nanjing, 1030/1210, MU2802, China Eastern Airlines

3)
Kuala Lumpur-Guangzhou, 0550/0950, AK112
Guangzhou-Nanjing, 1055/1245, MU2808, China Eastern Airlines

For the price, you would better consult the local booking agencies or airlines directly, since the airfare for the international flights changes from day to day. In addition, it would be cheaper to buy the international tickets at the departure city.