IB 102 then IB 421 at Madrid
Buenos Aires → Madrid → Barcelona
Timetable, Madrid time
05:30IB 102 from Buenos Aires at the gate
18:00IB 421 to Barcelona leaves the gatealso LL 3021, VY 5122, AV 6170, QR 6971
12 h 30 apart on the timetable
IB 421 leaves 12 h 30 after IB 102 arrives on the timetable: more than half a day, so not a connection we count.