What is the best major or minor to pair with an International Relations major?
I might actually encourage you to forgo a second major and instead take a broader variety of classes so that you can explore more areas. You never know what class could spark a new interest or help you see IR in a new light. That's the beauty of the liberal arts: there are endless connections you can make across a broad array of subjects.
Source: I majored in English Lit and Classics, but took classes in 10-12 other departments.
It depends on your goals and interests. In my field, business is a great pairing in with international relations. For those interested in government work, public administration is another good option.
What are some careers you are considering pursuing?