Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bali to Kabul as you normally would.
If you book a flight to Kabul from Bali, you will be flying to Khwaja Rawash, which is the city’s only airport. Kabul Khwaja Rawash (KBL) is located 5.6 km from the centre of Kabul.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Denpasar Bali Ngurah Rai Airport to Kabul Khwaja Rawash Airport flight would often be abbreviated as a DPS to KBL flight.