W9 5361 then FR 4587 at Barcelona
London Luton → Barcelona → Porto
Timetable, Barcelona time
08:55W9 5361 from London Luton at the gate
21:45FR 4587 to Porto leaves the gate
12 h 50 apart on the timetable
FR 4587 leaves 12 h 50 after W9 5361 arrives on the timetable: more than half a day, so not a connection we count.