sales with people ?(leave)

Would it be correct to use "sales" to ask when someone is leaving? Cuando sales su?

I think you would use salir in the futuro tense therefore I think you would say "¿Cuando saldrás?" (Informal) or "¿Cuando saldrá usted?" (Formal) I think you could also use ir in the futuro and say "¿Cuando irás? (When will you go? informal) or "¿Cuando irá usted?" (When will you go? formal). Can someone confirm or correct this? Gracias.