The National Flute Association High School Soloist Competition, as well as their Young Artist Competition (up to age 30) are some of the most prestigious competitions in the United States. They have specific repertoire requirements, and require a great deal of preparation. Get started early!
The first round is submitted online, and is then cut down to a small field of semi-finalists, which compete in Washington D.C. at the annual Flute Convention in August 2015. Please see their website for more details.