IB 5379 then IB 5420 at Barcelona
Santander → Barcelona → London Gatwick
Timetable, Barcelona time
19:05IB 5379 from Santander at the gate
18:10IB 5420 to London Gatwick leaves the gatealso LL 5420, VY 7624, BA 8078
23 h 05 apart on the timetable, overnight
IB 5420 leaves 23 h 05 after IB 5379 arrives on the timetable: more than half a day, so not a connection we count.