IB 5409 then QR 3655 at Barcelona
London Gatwick → Barcelona → Valletta
Timetable, Barcelona time
18:30IB 5409 from London Gatwick at the gatealso LL 5409, VY 7613, BA 8067
13:00QR 3655 to Valletta leaves the gatealso IB 5118, LL 5118, LA 5778
18 h 30 apart on the timetable, overnight
QR 3655 leaves 18 h 30 after IB 5409 arrives on the timetable: more than half a day, so not a connection we count.