BA 246 then BA 870 at Heathrow
São Paulo → London → Budapest
Timetable, London time
06:30BA 246 from São Paulo at the gate
19:25BA 870 to Budapest leaves the gate
12 h 55 apart on the timetable
BA 870 leaves 12 h 55 after BA 246 arrives on the timetable: more than half a day, so not a connection we count.