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