Did u know that a housefly can alive only 14 days ? Yeah, its a true fact. The housefly is a well-known cosmopolitan pest & this species found in association with humans or the activities of humans. Mainly the adults of housefly lives only 15 to 25 days. A housefly stay survive only 2 or 3 days without any food. The Housefly’s longevity is depending on availability of suitable food, specially sugar.