3O 375 then QR 3683 at Barcelona
Nador → Barcelona → Santander
Timetable, Barcelona time
20:103O 375 from Nador at the gate
16:05QR 3683 to Santander leaves the gate
19 h 55 apart on the timetable, overnight
QR 3683 leaves 19 h 55 after 3O 375 arrives on the timetable: more than half a day, so not a connection we count.