The British Airways flight to London was taxiing at OR Tambo International Airport when its right wing hit the building, injuring four people inside.
Images show the wing of the Boeing 747 wedged in the structure.
South Africa’s Civil Aviation Authority said the aircraft had travelled down a taxi-way that was too narrow for it.
The incident involving the Boeing 747-400 happened late on Sunday.
The control tower “told them to take one taxi-way and they took another one. They took a wrong one,” said aviation authority spokeswoman Phindiwe Gwebu.
None of those on board was injured but four ground staff in the building was hurt.
The passengers were allowed to leave the plane after about an hour but because of the fuel spillage they had still not been able to reclaim their luggage.
The aircraft has since been moved and operations have not been disrupted, Airports Company South Africa says.
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