QR 3755 then IB 5420 at Barcelona
Paris Orly → Barcelona → London Gatwick
Timetable, Barcelona time
23:30QR 3755 from Paris Orly at the gatealso IB 5879, LL 5879, VY 8029
18:10IB 5420 to London Gatwick leaves the gatealso LL 5420, VY 7624, BA 8078
18 h 40 apart on the timetable, overnight
IB 5420 leaves 18 h 40 after QR 3755 arrives on the timetable: more than half a day, so not a connection we count.