FR 13 then BT 684 at Barcelona
Vienna → Barcelona → Riga
Timetable, Barcelona time
19:35FR 13 from Vienna at the gate
14:05BT 684 to Riga leaves the gatealso IB 7848
18 h 30 apart on the timetable, overnight
BT 684 leaves 18 h 30 after FR 13 arrives on the timetable: more than half a day, so not a connection we count.