In terms of fees, US universities do not tend to differentiate between domestic and international students. Public universities charge lower fees for students from within the same state compared to everyone else, while private universities usually have one set fee for everyone. To give you an example, the highest-ranked university in both the world and the US, Massachusetts Institute of Technology (MIT), has set its tuition fees at $49,580 per year for all undergraduate and most graduate programs in the 2017/18 academic year.
However, fees vary significantly from university to university. Studying in the US certainly won’t be cheap, but most US universities are very good at providing accessible information about the cost of study – including tuition fees, course resources, accommodation, food, insurance and other expenses.