22 kilometers. According to Baidu map, it is 22 kilometers from Nanjing North Station subway to Southeast University in Jiangning District. You can take subway line 3 for 50 minutes. Less time consumption and relatively low cost. You can also take a taxi, 120 yuan, 1 hour 20 minutes. Southeast University, located in Nanjing, Jiangsu Province, is one of the earliest institutions of higher learning in China.