Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Indonesia to Luxembourg as you normally would.
Jakarta Soekarno-Hatta Intl
Luxembourg
2 stops
28h 30mMultiple Airlines
Jakarta Soekarno-Hatta Intl
Luxembourg
3 stops
44h 25mMultiple Airlines
Jakarta Soekarno-Hatta Intl
Luxembourg
3 stops
38h 10mMultiple Airlines
Yes, there are multiple flights from Indonesia to Luxembourg for under Rp 10,715,900. The cheapest flight booked recently is on Multiple Airlines for just Rp 10,715,854, but on average you can expect to pay Rp 13,980,384.