FR 4586 then IB 5420 at Barcelona
Porto → Barcelona → London Gatwick
Timetable, Barcelona time
21:10FR 4586 from Porto at the gate
18:10IB 5420 to London Gatwick leaves the gatealso LL 5420, VY 7624, BA 8078
21 h apart on the timetable, overnight
IB 5420 leaves 21 h after FR 4586 arrives on the timetable: more than half a day, so not a connection we count.