FR 4584 then IB 5480 at Barcelona
Porto → Barcelona → Nantes
Timetable, Barcelona time
18:35FR 4584 from Porto at the gate
10:45IB 5480 to Nantes leaves the gatealso VY 8140
16 h 10 apart on the timetable, overnight
IB 5480 leaves 16 h 10 after FR 4584 arrives on the timetable: more than half a day, so not a connection we count.