<p>Many schools (even some schools with seemingly strict core or distribution requirements) offer numerous interdisciplinary majors. Area studies, architectural studies, and environmental studies are examples of majors that usually give you the flexibility to combine courses from several conventional departments in various ways. </p>
<p>Other fields associated with a single department are nevertheless inherently interdisciplinary. Anthropology, for example, can be studied from a biological, cultural, or linguistic perspective. A good history department might support a history of science focus, history of ideas with a strong philosophical orientation, social history, etc.</p>
<p>So if you are flexible about what you mean by “flexible”, you are bound to find flexibility in places you might not expect.</p>