IB 5423 then LA 5769 at Barcelona
London Heathrow → Barcelona → Cagliari
Timetable, Barcelona time
13:10IB 5423 from London Heathrow at the gatealso VY 7641
11:05LA 5769 to Cagliari leaves the gate
21 h 55 apart on the timetable, overnight
LA 5769 leaves 21 h 55 after IB 5423 arrives on the timetable: more than half a day, so not a connection we count.