To begin with, there is tremendous cross-over between online high schools and homeschooling. Some homeschooling families do use an online program.
As for your son, one concern with an online program that is not closely monitored is that it will require too much independent work and will bore him.
One school that your son might consider is 3DLearn Interactive Academy in Bonita Springs, Florida. It is located on the web at:
http://www.3dlearn.comFrom Complete Guide to Online High Schools:
Perhaps the coolest online high school, 3DLearn Interactive Academy promotes an academic environment based on constructivist learning. It provides students with a virtual reality universe called Wiloworlds where students learn by doing. For example, on a typical day, a student might be doing role-play of an historical figure. They also might be learning 3D computer programming or putting on a play.My thinking is that you need to find something that challenges him and that keeps him interested. That may be the way to go.
I encourage you to ask follow-up questions.
Tom Nixon