You are looking for a one way flight on the 25th CCS-MAD, correct?
Searching on lufthansa.com with your country set as Venezuela does not return anything for me. If you set your country to Germany, the earliest available flight is Saturday, September 27th, CCS-FRA-MAD on LH535 and LH1114.
On the 25th the cheapest option is the direct on Air Europa, which prices at ~600€ at various OTAs.

Paying in VEF might be tricky, given the recent problems with the Venezuelan government.