The west London hub, which is continuing to push for an additional runway, saw pre-tax profits increase from £183 million to £223 million. Passenger numbers were up 2.2% to 75 million.
Over the course of its financial year, which ended on December 31, Heathrow poached two long-haul airlines from rival Gatwick with both Garuda Indonesia and Vietnam Airlines switching their services.
John Holland-Kaye, chief executive, said: “As we approach our 70th anniversary, our colleagues are delivering the best service we’ve ever achieved to a record number of passengers.