QR 3615 then BA 485 at Barcelona
Catania → Barcelona → London Heathrow
Timetable, Barcelona time
22:35QR 3615 from Catania at the gatealso IB 5803, LL 5803, VY 6119
17:00BA 485 to London Heathrow leaves the gate
18 h 25 apart on the timetable, overnight
BA 485 leaves 18 h 25 after QR 3615 arrives on the timetable: more than half a day, so not a connection we count.