OS 644 then FR 802 at Vienna
Prague → Vienna → Valencia
Timetable, Vienna time
11:50OS 644 from Prague at the gate
06:15FR 802 to Valencia leaves the gate
18 h 25 apart on the timetable, overnight
FR 802 leaves 18 h 25 after OS 644 arrives on the timetable: more than half a day, so not a connection we count.