Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bacolod to Duesseldorf Intl Airport as you normally would.
For a flight from Bacolod to Duesseldorf Intl, you will be flying from Bacolod. Bacolod (BCD) is just 14.3 km from the center of the city. Bacolod is the only Bacolod airport and it handles 0 outbound flights to Duesseldorf Intl per day. 0 airlines have flights to Duesseldorf Intl from Bacolod on a regular basis.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Bacolod Airport to Duesseldorf Intl Airport flight would often be abbreviated as a BCD to DUS flight.