LL 5481 then QR 3619 at Barcelona
Nantes → Barcelona → Cagliari
Timetable, Barcelona time
17:20LL 5481 from Nantes at the gate
07:15QR 3619 to Cagliari leaves the gate
13 h 55 apart on the timetable, overnight
QR 3619 leaves 13 h 55 after LL 5481 arrives on the timetable: more than half a day, so not a connection we count.