BA 8083 then QR 4704 at Barcelona
London Heathrow → Barcelona → Porto
Timetable, Barcelona time
13:10BA 8083 from London Heathrow at the gate
08:35QR 4704 to Porto leaves the gate
19 h 25 apart on the timetable, overnight
QR 4704 leaves 19 h 25 after BA 8083 arrives on the timetable: more than half a day, so not a connection we count.