KL 3379 then BA 465 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
18:10BA 465 to London Heathrow leaves the gate
21 h 10 apart on the timetable, overnight
BA 465 leaves 21 h 10 after KL 3379 arrives on the timetable: more than half a day, so not a connection we count.