QR 3754 then IB 5416 at Barcelona
Santander → Barcelona → London Gatwick
Timetable, Barcelona time
19:05QR 3754 from Santander at the gate
17:45IB 5416 to London Gatwick leaves the gatealso LL 5416, VY 7620, BA 8074
22 h 40 apart on the timetable, overnight
IB 5416 leaves 22 h 40 after QR 3754 arrives on the timetable: more than half a day, so not a connection we count.