FR 339 then FR 7078 at Dublin
London Luton → Dublin → Porto
Timetable, Dublin time
20:30FR 339 from London Luton at the gate
11:25FR 7078 to Porto leaves the gate
14 h 55 apart on the timetable, overnight
FR 7078 leaves 14 h 55 after FR 339 arrives on the timetable: more than half a day, so not a connection we count.