In the sense of 'jolly' ,'delighted' and 'joyful' you can also say : jubilant, overjoyed, cheerful, sunny ,enchanted, blissed out, enraptured As an expression you can use: floating on air , walking on air , over the moon,on cloud nine As JacquiD says, the word "happy" has many connotations ,thus the exact synonym to use will vary from one context to the other.

Happy can mean 'in high spirits' or 'satisfied' so there are a number of synonyms for both meanings. In high spirits = elated, cheerful, exultant, merry, overjoyed etc Satisfied = pleased, content, contented, gratified etc. So it depends in what sense you want to use 'happy'.

ecstatic! That's my favorite.

Elated, blissful, excited, depends on the context that you want to use it. Emotion or just expressing something else.... :)