Not sure if I want to contribute to a thread that seems maybe possibly trolly, but there is a way.
Doing so in the way you're probably expecting is not, strictly speaking, possible. To "disappear" visually means to refract light in such a way that you do not reflect it back to the eyes of people. This is something that is becoming possible through technology, but no technique I'm aware of makes it possible in a physical sense. However, you can absolutely do this on an energetic level. Deflecting conscious energies will make people less aware of you, deflecting mental energies will make it more difficult to think about you or hold to any emotional reaction toward you.
Teleportation is a different matter entirely. To "disappear" in the sense of ceasing to be where you are, and reappearing somewhere else, is not something even technology has managed for a human being. This is, again, something you can do energetically. By displacing the majority of your consciousness, you not only gain sensory awareness from another location in the conscious world, but enter a state of energetic decline. The "you" in that other location steals the energy from your body. This makes it very difficult for others to sense your body's presence.
Moving the majority of your mental energy does this on a different level. Your thoughts and emotions occur far from your mental location, meaning that it becomes difficult for a psychic to tell your thoughts apart from their own, or from those of other people. Like mental camo. You also enter a state of psychic decline, your body responding less to your thoughts and more to the thoughts of those nearest you.
As for flight, that is a misunderstanding of ancient witchcraft. "Flying potions" were used to experience elevated spiritual states, not to physically fly. When non-magical people heard of this, they misinterpreted the term.
It is commonly reported by UFO abductees that they were taken through walls. There is even a NYC police eyewitness to such an event.
This works because the human body is made up of various subplane substances. As we discard the dense vibrations the body becomes more of the light, merely manifesting the appearance of solids, liquids and gases.
It should be simple to teleport but there seems to be some programming of the sacral chakra to prevent it.
The UFOs use technology for this, so it must be known in the various secret space programs