KL 3379 then IB 719 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
14:55IB 719 to London Heathrow leaves the gatealso VY 5226, QR 5346, LA 5409, DT 6162, BA 7054, AA 8653
17 h 55 apart on the timetable, overnight
IB 719 leaves 17 h 55 after KL 3379 arrives on the timetable: more than half a day, so not a connection we count.