How much is the departure tax?
As of February 2015, all airlines departing from Indonesia are required to include the airport departure tax in the price of the ticket. This new regulation is valid for both domestic flights as well as international flights departing from Indonesia.
If you have purchased your ticket before that date but are leaving Indonesia after that date you might be asked from the airline to pay this fee online. Otherwise the PSC payment counters are still there at the airport. So one way or the other, you will be reminded to pay. The fee for international flight is Rp. 200.000.