U2 2323 then QR 4705 at Barcelona
London Luton → Barcelona → Porto
Timetable, Barcelona time
20:10U2 2323 from London Luton at the gate
13:00QR 4705 to Porto leaves the gatealso IB 5092, LL 5092
16 h 50 apart on the timetable, overnight
QR 4705 leaves 16 h 50 after U2 2323 arrives on the timetable: more than half a day, so not a connection we count.