W4 6018 then FR 8481 at Fiumicino
Barcelona → Rome → Seville
Timetable, Rome time
11:55W4 6018 from Barcelona at the gate
06:25FR 8481 to Seville leaves the gate
18 h 30 apart on the timetable, overnight
FR 8481 leaves 18 h 30 after W4 6018 arrives on the timetable: more than half a day, so not a connection we count.