British Airways will add three flights a week on its Cape Town-Heathrow route from March 30 until April 19.
This follows the announcement of two extra flights between Cape Town and Gatwick scheduled for operation in 2021.
The airline will also increase frequencies to Miami and Seattle from Heathrow this Northern hemisphere spring.
An additional daily service to Seattle will operate from May 1-31 and a daily service to Miami from April 1 until May 31.
British Airways offers 36 flights a week between South Africa and the UK – 19 Cape Town services, twice-daily flights from Johannesburg, and thrice-weekly Durban-London flights.