Adults 10 euro at the door. Children 2-12 and seniors 65+ 8.50 when there. Adults 8.50 on-line (good for 3 months). Seniors and children 7.50 on-line.
I believe if you book online in advance (no matter how far in advance!) it is 8.50, or 10.00 on the door - maybe a family price & less for children :-)
Get quick answers from Butterfly Park of Benalmadena staff and past visitors.