British Airways is adding an extra three flights per week to its Heathrow to Cape Town route from May.
The national carrier is currently operating a double-daily service between the two cities during the busy October to May southern hemisphere summer season.
This will halve for winter to a daily service from March until May 1, which is when BA will add three B777-200ERs onto the route - an extra 657 seats per week.
The additional aircraft will be deployed overnight, leaving London on Mondays, Thursdays and Saturdays, and departing Cape Town on Tuesdays, Fridays and Sundays.
The Boeing 777-200ERs being used on the Cape Town route will have a four-cabin configuration with 12 seats in First, 48 in Club World (business), 32 in World Traveller Plus (premium economy) and 127 in World Traveller (economy).
Gavin Halliday, BA's general manager for Africa and Europe, said: "Operating year-round builds confidence in the route, not only among inbound tourists and business travellers, but also local customers wanting to visit London or travel onwards to the rest of our network.
"The fact that we are now able to bolster our winter schedule is testimony to this and the tremendous job which has been done to market Cape Town as a year-round destination as well as a business hub."
BA is opening a new lounge, modelled on its Galleries lounge at LHR Terminal 5, in Cape Town by the end of this month.
Last week, it was announced that BA has partnered with Fairmont Hotels to offer a 20 per cent discount on any economy flight between Heathrow and the US or Canada (see news, November 29).