QR 3636 then BA 477 at Barcelona
Algiers → Barcelona → London Heathrow
Timetable, Barcelona time
19:40QR 3636 from Algiers at the gate
12:20BA 477 to London Heathrow leaves the gate
16 h 40 apart on the timetable, overnight
BA 477 leaves 16 h 40 after QR 3636 arrives on the timetable: more than half a day, so not a connection we count.