OS 402 then FR 731 at Vienna
Barcelona → Vienna → London Stansted
Timetable, Vienna time
12:10OS 402 from Barcelona at the gate
09:40FR 731 to London Stansted leaves the gate
21 h 30 apart on the timetable, overnight
FR 731 leaves 21 h 30 after OS 402 arrives on the timetable: more than half a day, so not a connection we count.