How many holes does a flute have?

16 tone holes.

Explanation:

And depending on which flute you get, it can vary in holes it has. Such as a Bansuri, it has 7-8 holes in it. (commonly found as a wooden one)

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.