BA 482 then QR 4686 at Barcelona
London Heathrow → Barcelona → Lisbon
Timetable, Barcelona time
17:15BA 482 from London Heathrow at the gate
15:50QR 4686 to Lisbon leaves the gatealso IB 5114, LL 5114
22 h 35 apart on the timetable, overnight
QR 4686 leaves 22 h 35 after BA 482 arrives on the timetable: more than half a day, so not a connection we count.