KL 3379 then IB 723 at Madrid
Lanzarote → Madrid → London Heathrow
Timetable, Madrid time
21:00KL 3379 from Lanzarote at the gatealso AF 4837, DL 6773, AM 6823, EY 7580, UX 9076
16:45IB 723 to London Heathrow leaves the gatealso LA 1702, VY 5421, QR 6907, AA 8770
19 h 45 apart on the timetable, overnight
IB 723 leaves 19 h 45 after KL 3379 arrives on the timetable: more than half a day, so not a connection we count.