QR 3575 then U2 2324 at Barcelona
Palma de Mallorca → Barcelona → London Luton
Timetable, Barcelona time
18:05QR 3575 from Palma de Mallorca at the gate
10:35U2 2324 to London Luton leaves the gate
16 h 30 apart on the timetable, overnight
U2 2324 leaves 16 h 30 after QR 3575 arrives on the timetable: more than half a day, so not a connection we count.