QUICK ANSWER
"Hasta que" is a phrase which is often translated as "until", and "a qué" is a phrase which is often translated as "to what". Learn more about the difference between "hasta que" and "a qué" below.
hasta que(
ahs
-
tah
keh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a qué(
ah
keh
)A phrase is a group of words commonly used together (e.g., once upon a time).