People were evacuated from two communities - Abejeras and Forest Hills. A spokesperson for Andalusia's civil defence said no other communities were known to be at risk from the blaze.
Estepona, near Malaga, is popular with British retirees and holidaymakers.
Andalucia's regional government said in a statement that around 250 firefighters were tackling the blaze which started on Wednesday (September 9) evening.
As of late August, wildfires have ravaged 74,260 hectares in Spain - higher than average numbers over the last 10 years.