FR 4546 then IB 5418 at Barcelona
Porto → Barcelona → London Gatwick
Timetable, Barcelona time
20:40FR 4546 from Porto at the gate
18:00IB 5418 to London Gatwick leaves the gatealso LL 5418, VY 7622
21 h 20 apart on the timetable, overnight
IB 5418 leaves 21 h 20 after FR 4546 arrives on the timetable: more than half a day, so not a connection we count.