I think "longing" is the best fit, though, it's not a perfect substitute as saudade and longing can have different uses.

<a href="https://sentence.yourdictionary.com/longing" rel="noopener noreferrer" target="_blank">https://sentence.yourdictionary.com/longing</a>;

I think it would be: " I miss you" or "longing", as Wesley said. Both are not like "saudade, because this word is very unique and there isn't any word in another foreigner language, that it's like "saudade", just similar meaning. Well, keep up with the good work!! Let's try to help each other with the language practises : )

Sorry I don't know