vs 

QUICK ANSWER
"A qué hora" is a form of "a qué hora", a phrase which is often translated as "at what time". "Cuándo" is a form of "cuándo", an adverb which is often translated as "when". Learn more about the difference between "a qué hora" and "cuándo" below.
a qué hora(
ah
 
keh
 
oh
-
rah
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. at what time
¿A qué hora quedaste con Charlie? - A las 8 pm.At what time did you arrange to meet Charlie? - 8 pm.
b. what time
No sé a qué hora sale el último bus.I don't know what time the last bus leaves.
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cuándo(
kwahn
-
doh
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. when
¿Cuándo vas a terminar tus deberes?When are you going to finish your homework?
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. when
Nos vamos a casar, pero el cuándo y el dónde aún no lo sé.We are getting married, but I don't know when or where yet.
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