2006 entry costs to London zoo for an adult aged 16-59 is £13, with a suggested donation of £1.50 which takes the total to £14.50. If you have a child aged between 3 and 15 then the cost is £10, with a £1.50 donation which totals £11.50.
If you have a child under the age of 3 then they get free entry.

For families it may be cheaper to have a family ticket. Where you can have an adult and three children or two adults and two children and the total comes to £41 (or £47 if the donation is paid). This works out at a saving of £5 overall.

If you have a disability, or are aged 16 or over and are a student, then the cost is reduced to £11.20 which with the donation comes to £12.70.

If a disabled person needs to have a carer with them, then the carer can actually get free entry, but advice should be sought before visiting.