QR 3751 then BA 481 at Barcelona
Seville → Barcelona → London Heathrow
Timetable, Barcelona time
00:25QR 3751 from Seville at the gate
14:40BA 481 to London Heathrow leaves the gatealso IB 3663, AA 6819, VY 9559, QR 9800
14 h 15 apart on the timetable
BA 481 leaves 14 h 15 after QR 3751 arrives on the timetable: more than half a day, so not a connection we count.