Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast to Darwin as you normally would.
Darwin (DRW) is the airport you will fly into if you book a flight from Belfast to Darwin. You should not have trouble finding flights to Darwin from Belfast; the airport handles an average of 0 inbound flights from Belfast per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Darwin airport from Belfast. It is only a 4.0 mi journey from Darwin (DRW) to Darwin’s city center.