QR 3745 then U2 2324 at Barcelona
Milan → Barcelona → London Luton
Timetable, Barcelona time
19:00QR 3745 from Milan at the gatealso IB 5359, LL 5359, VY 6047
10:20U2 2324 to London Luton leaves the gate
15 h 20 apart on the timetable, overnight
U2 2324 leaves 15 h 20 after QR 3745 arrives on the timetable: more than half a day, so not a connection we count.