The best dating site for me if you wanted to mix it up for both United States and Colombia or anywhere else Latin. Amigos is the best for that, the site has been around for over 11 years or more and has tons of Latin women from all over Latin America plus US Latin girls as well. It’s free to join and browse, then if you want to become premium it starts at only $19.99, has live chat options as well as just plain old email options which I actually prefer. Call me old school but the old way works fine why change it. If I want to see the girl, I just see her on msn video chat after I get her email.
It’s worth a try as well due to the fact that you can actually meet a nice Colombian girl right here, and that will save you some cash flying to the source direct. If she is no good, consider it a learning experience prior to your trip. The more you learn about Colombianas before you go the better off you are. Same goes for each city as well, Medellin is very different from the other cities, so if you know a little about Paisas (people from Medellin) it will be helpful. Good luck!