The added charge will see all long-haul ticket prices increase by £10 for single journeys, and £20 for return flights.
BA has said that the rise in prices reflects the "substantial recent increase in the price of oil".
The move means BA's World Traveller flights will increase to £63 on journeys lasting less than nine hours, and £76 on journeys longer than nine hours. Prices of World Traveller Plus, First and Club World flights will also increase according to the nine hour flight time.
No charges will be added to shorthaul flights.
BA recently promoted sales and marketing director Andrew Crawley to the role of commercial director of the newly created IAG. Frank van der Post has been hired as managing director, brands and customer experience, and will oversee all of BA's future marketing activity.
The airline recently launched an advertising campaign, created by BBH, which takes on budget airlines by highlighting the hidden extras behind low-cost fares.
Separately low-cost carrier Ryanair has announced it is cutting 34 routes connecting to Germany, including flights to Bremen and Dusseldorf, because of Germany's €8 tourist tax being introduced in January.