IB 409 then QR 3503 at Barcelona
Madrid → Barcelona → Santander
Timetable, Barcelona time
11:45IB 409 from Madrid at the gatealso LA 1624, CX 1827, LL 3009, VY 5116, AV 6078, BA 7129, QR 7246, AA 8727
11:20QR 3503 to Santander leaves the gate
23 h 35 apart on the timetable, overnight
QR 3503 leaves 23 h 35 after IB 409 arrives on the timetable: more than half a day, so not a connection we count.