QR 3754 then IB 5408 at Barcelona
Santander → Barcelona → London Gatwick
Timetable, Barcelona time
19:05QR 3754 from Santander at the gate
13:25IB 5408 to London Gatwick leaves the gatealso LL 5408, VY 7612, BA 8066
18 h 20 apart on the timetable, overnight
IB 5408 leaves 18 h 20 after QR 3754 arrives on the timetable: more than half a day, so not a connection we count.