LH 75 then 4Y 900 at Frankfurt
Düsseldorf → Frankfurt am Main → Dubrovnik
Timetable, Frankfurt am Main time
15:15LH 75 from Düsseldorf at the gate
09:254Y 900 to Dubrovnik leaves the gate
18 h 10 apart on the timetable, overnight
4Y 900 leaves 18 h 10 after LH 75 arrives on the timetable: more than half a day, so not a connection we count.