A fly is any one of the large number of insects that uses one set of wings for flight and one for balance. Fly is commonly used for most small flying insects.
Positive: Dreaming of flies could represent different stages in one’s spiritual walk.
Negative: Seeing flies in your dream could symbolize Beelzebub, demons, corruption of the house, or possession by demonic spirits of a person. Dreaming of flies could also represent God showing you that you have a bad smell in His nostrils and an unclean spirit.
(Ecclesiastes 10:1; Matthew 12:24; 2 Kings 1:16).