Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Jakarta to Cadiz as you normally would.
Related info for your journey
Useful info, stats and facts about Jakarta to Cadiz flights.
Great question - CGK to SVQ just means Jakarta Soekarno-Hatta Intl Airport to Sevilla Airport. Now you’ll know what these unique codes when you look for flights! Jerez de la Frontera La Parra Airport (XRY) are other airports near this flight route and their unique identifiers/IATA codes.