WK 439 then BA 717 at Zurich
Split → Zurich → London Heathrow
Timetable, Zurich time
16:50WK 439 from Split at the gate
16:30BA 717 to London Heathrow leaves the gate
23 h 40 apart on the timetable, overnight
BA 717 leaves 23 h 40 after WK 439 arrives on the timetable: more than half a day, so not a connection we count.