IB 5423 then VY 1304 at Barcelona
London Heathrow → Barcelona → Alicante
Timetable, Barcelona time
13:10IB 5423 from London Heathrow at the gatealso VY 7641
12:40VY 1304 to Alicante leaves the gatealso QR 3615
23 h 30 apart on the timetable, overnight
VY 1304 leaves 23 h 30 after IB 5423 arrives on the timetable: more than half a day, so not a connection we count.