There are a few ways to transfer an international flight to a domestic one in Jakarta.
The first way is to take a taxi from the airport to the domestic terminal. The taxi fare is around IDR 100,000-150,000 ($7-10 USD) and the journey should take around 30 minutes.
The second way is to take a bus from the international terminal to the Soekarno-Hatta International Airport (Cengkareng) bus station. The bus fare is IDR 20,000 ($1.50 USD) and the journey should …