Spanish is the spoken language of Chile, in the city, you may find some who speak English but in the countryside – forgettaboutit.
The Duolingo app and language website is free. If you are diligent and practice for at least 3 months, it will help you get by. An excellent start is phrases, numbers, times, and days.
Install Google Translate on your smartphone and learn to operate this app. Translate is slow and not perfect, but you can make others understand you, and perhaps you can understand them, its easier than learning the language. Google translate works offline on my iPhone when I do not have a data connection.
Practice and be very patient as you are the visitor but remember, Chileans are friendly and helpful.
And remember that when you leave to say chao pescado, you will get a laugh.