IB 450 then CX 1751 at Madrid
Hondarribia → Madrid → Buenos Aires
Timetable, Madrid time
22:40IB 450 from Hondarribia at the gatealso LA 1639, CX 1843, BA 4273, VY 5207, AV 6181, QR 6595, AA 8720
12:20CX 1751 to Buenos Aires leaves the gatealso BA 4255, AY 5375
13 h 40 apart on the timetable, overnight
CX 1751 leaves 13 h 40 after IB 450 arrives on the timetable: more than half a day, so not a connection we count.