How can I know if there are movies subtitled in Spanish?

You should ask .. soon to and subtitles in Spanish nothing more ..

It should say on the website where you look up movie times if it is offered in spanish cc. I do not think this theater offers it. Only on well rounded and known movies they offer it, like "instructions not included" they offered it.

try checking the AMC app

You have to ask

You might have to go there and ask. But I have never seen it there. Better Google for Spanish theaters.

I dont think there is either

That is a very good question, I doubt that they ever show Spanish subtitles in any of their feature films.

I never heard of seen any movie showings with Spanish subtitles at any AMC theatre.