IB 5413 then QR 3573 at Barcelona
London Gatwick → Barcelona → Cagliari
Timetable, Barcelona time
19:35IB 5413 from London Gatwick at the gatealso LL 5413, VY 7617, BA 8071
11:05QR 3573 to Cagliari leaves the gatealso IB 5798, LL 5798, VY 6114
15 h 30 apart on the timetable, overnight
QR 3573 leaves 15 h 30 after IB 5413 arrives on the timetable: more than half a day, so not a connection we count.