Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Townsville to Jakarta as you normally would.
For a flight from Townsville to Jakarta, you will be flying from Townsville. Townsville (TSV) is just 4.5 km from the centre of the city. Townsville is the only Townsville airport and it handles 0 outbound flights to Jakarta per day. 0 airlines have flights to Jakarta from Townsville on a regular basis.
Foreigners under the age of 12 years who are travelling with their parents are exempted from this requirement.