IB 2471 then BA 479 at Barcelona
Leon → Barcelona → London Heathrow
Timetable, Barcelona time
20:25IB 2471 from Leon at the gatealso LL 3101, VY 5871, QR 6959
13:35BA 479 to London Heathrow leaves the gate
17 h 10 apart on the timetable, overnight
BA 479 leaves 17 h 10 after IB 2471 arrives on the timetable: more than half a day, so not a connection we count.