The OR Tambo International Airport, outside Johannesburg, was experiencing flight delays on Thursday due to a power outage, it said.
“While essential services operated on back-up power, a backlog is being experienced, as some services had to be facilitated manually,” said spokeswoman Unathi Batyashe-Fillis in a statement.
Travellers were asked to be patient, to co-operate with officials, and to call their airlines for flight information.
Eskom earlier announced power cuts were scheduled to last from 9am to 10pm across the country due to seven days of heavy rain leaving coal stocks wet.
Consumers were urged to switch off all non-essential appliances. - Sapa