Flight is an ability which is not seen that often in Naruto. Very few shinobi possessed the ability to fly throughout the series. While some could fly normally, others needed to awaken the ability to fly.
Here are all the 8 characters who have shown the ability to fly in Naruto.
NOTE: Movie Characters are NOT included
Onoki was one of the few shinobi who were seen levitating. He achieved this feat by altering his density, and also by decreasing his own gravity.
Onoki also possesses the ability to grant others the ability to levitate. He was seen levitating countless times during the 4th Great Ninja War.