KL 749 then U2 7925 at Schiphol
Cartagena → Amsterdam → Prague
Timetable, Amsterdam time
10:45KL 749 from Cartagena at the gate
07:00U2 7925 to Prague leaves the gate
20 h 15 apart on the timetable, overnight
U2 7925 leaves 20 h 15 after KL 749 arrives on the timetable: more than half a day, so not a connection we count.