This was almost 3% higher than that of the London Overground
service.
Spokesperson for the Gautrain's operator, Nano Gasenewe,
said the good track record was achieved despite two service disruptions because
of cable theft.
The Sandton-airport link had a punctuality record of 99.6%
over the same period.
Wednesday would mark the 50th day of the service between
Rosebank, in Johannesburg and Hatfield, Pretoria.
Forty million passenger kilometres - equivalent to about 1
000 times around the world - had been completed in this period.
The Gautrain had completed 48 000 station-to-station trips
on this route and had carried 1.2 million passengers.
"Train passengers are currently averaging about 28 000
per day and bus passengers about 9 000 per day, both with steady growth.
"We are immensely proud to have consistently achieved
service levels comparable to the best systems anywhere in the world," Bombela
executive Errol Braithwaite said.
He said the company aimed to improve its service and hoped to announce several new initiatives in the near future.