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.
Denpasar Bali Ngurah Rai Airport is DPS and Luxembourg Airport is LUX. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Jakarta Soekarno-Hatta Intl Airport (CGK), Surabaya Juanda Airport (SUB), Praya Lombok Intl Airport (LOP), Medan Kuala Namu Intl Airport (KNO), Yogyakarta Intl Airport (YIA).