Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Jakarta to Asmara as you normally would.
Asmara Intl (ASM) is the airport you will fly into if you book a flight from Jakarta to Asmara. You should not have trouble finding flights to Asmara Intl from Jakarta; the airport handles an average of 0 inbound flights from Jakarta per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Asmara airport from Jakarta. It is only a 5.6 km journey from Asmara Intl (ASM) to Asmara’s city centre.