IB 5401 then QR 3602 at Barcelona
London Gatwick → Barcelona → Rome
Timetable, Barcelona time
13:00IB 5401 from London Gatwick at the gatealso LL 5401, VY 7605, BA 8059
12:30QR 3602 to Rome leaves the gate
23 h 30 apart on the timetable, overnight
QR 3602 leaves 23 h 30 after IB 5401 arrives on the timetable: more than half a day, so not a connection we count.