Due to multiple factors, expect to potentially pay more when booking in August. For low rates, May can be a great choice for travel to Zambia. Flights to Zambia from Kuala Lumpur in May are about RM 5,108 on average during May, but can be found for as low as RM 2,566.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kuala Lumpur to Zambia as you normally would.