People dislike flies because they live on food that has rotted, and because they spread diseases, so flies in a dream can represent negative influences in your life that you need to manage before they start to destroy you and before they start to harm others.
If you dream that your food is covered in flies, someone may be trying to help you, but in fact, be causing you harm.
A fly that buzzes around you in a dream can symbolize an irritating person or situation.
Swatting a fly in a dream can be a message that you need to deal with an annoyance before it becomes overwhelming.
If you dream of a fly that is flying aimlessly around a room, you could be wasting your time with unproductive activities.
Seeing a fly on a wall in a dream can mean that you want your activities to go unnoticed.