Do you mean to the capital city Jakarta? There are no direct flights from Hangzhou to Jakarta, only connecting flights transferring at Hong Kong, Guangzhou or Singapore available. Besides, one direct flight of Garuda Indonesia Airlines are operating on each Mon, Tue, Thur and Saturday from Shanghai to Jakarta. Thus, you can take bus or D train to Shanghai first and then take the direct flight to Jakarta. Or, take connecting flight with transfer at Guangzhou from Hangzhou directly.