EC 1703 then IB 435 at Madrid
Nice → Madrid → Bilbao
Timetable, Madrid time
20:40EC 1703 from Nice at the gate
15:50IB 435 to Bilbao leaves the gatealso LA 1567, VY 5007, AT 5343, AV 6050, QR 6914, BA 7138, AA 8800
19 h 10 apart on the timetable, overnight
IB 435 leaves 19 h 10 after EC 1703 arrives on the timetable: more than half a day, so not a connection we count.