The additional flight will operate from London at 20:20 on Sunday evenings and land at 04:55 the next morning while the return service will leave Nairobi at 22:45pm on Monday evenings and arrive in London at 08:25 the next morning.
This will lead to 266 additional seats a week.
The aircraft, a Boeing 777-200 in a four-cabin configuration, offers First, Club World (business), World Traveller Plus (premium economy) and World Traveller (economy).
“Kenya is a growing economy and the additional flight has been scheduled as an overnight service so our customers, particularly those travelling on business, can make the most of their time,” says Ian Petrie, regional commercial manager for Africa.
The airline has also announced that three additional services it introduced to Johannesburg on a trial basis early last year have now been confirmed in its 2013 schedule.
This brings to 17 the number of weekly services it offers from London to Johannesburg.
“We have a long, proud history in Africa. Over 80 years ago our predecessor, Imperial Airways, pioneered air routes the length of the continent. Today we fly to more destinations in Africa more often than we ever have before,” says Petrie.
By the end of this month the airline will be serving 18 routes in 15 African countries.