It depends on what country you're in, but some exchanges like BTC-E, Coinbase, Xapo, Localbitcoins, and others are typically international exchanges. You'd have to look into the websites specifically in order to know which one is best for you and which one has the lowest fees, as I simply haven't been able to go and check every site.

There are some local exchanges that I use that have incredibly low fees, but they're local so it doesn't really matter in your case.