Duolingo, why are all of these lessons opening and closing so weirdly all of a sudden? The problem of the last answer of a group of questions appearing as the first answer of a new group of questions seems to have been caught, but why is each lesson ending by sending you all the way back to the intro menu so that you have to scroll again to the lesson you had started rather than taking you to the next group of questions in the series that you've been working in is getting pretty annoying.
Ir + a + infinitive is a very common way of saying what someone is going to do in the future. Your version might be technically correct (I'm not sure), but nobody would actually read it that way - not without any other context. They'd just assume you were talking about the future
I think people would probably say something like ¿cuándo van para aprender?, to be specific that it's a habitual go, done for a specific purpose. Hard to find any information on this though, maybe a native speaker is around!
edit: unless you meant it in the sense of "when do you go to the airport?" A single planned event in the future, so you're basically rephrasing "when are you going to the airport?" That feels pretty stilted to me, there are some phrases where it works ("when do you finish work today?") and others where it doesn't, and I'm reluctant to say it's a good translation here
Oh also this is important: there are two (?) ways of expressing the future in Spanish - voy a comer and comeré. Duolingo seems to be strict about translating voy a comer as "I am going to eat", and comeré as "I will eat". I assume it's so it can make sure you know there's a difference in Spanish, and you can use the correct one when you need to - maybe a little harsh, but it's how they're doing it. So you're probably expected to always translate ir + a + infinitive as "going to do something"