How Long Do Flies Live And Why?

logo by Editorial Staff | Updated on July 30th, 2022

The exact answer is 28 days (Approximately)

This blog post discusses how diet affects fly life span and what flies eat to survive.

black fly perched on green leaf in close up photography during daytime

What are flies?

Flies are insects that are members of the Arthropods phylum and the Diptera order. Diptera is a Greek term composed of two words: “di” means “two,” and “ptera” means “wings.” Dipteral insects have two wings.

What Is the Life Expectancy of Flies?

There are approximately a million species of fly known to science. Houseflies are the most frequent type of fly seen in our houses; other prevalent types include fruit insects, dragonflies, horse flies, and so on. The body of a fly has separated into three parts: a moveable head, a thorax, and an abdomen.

Typically, flies have six legs. Flies come in various body forms, are soft-bodied insects, and are typically modest in size. Houseflies are often gray or black in hue.

Flies have a fairly limited life span. Flies have an average life span of 28 days, about one month. Because other species largely consume them, just a few flies survive.

The lifespan of a House Fly compared. a Fruit Fly

A fly’s life expectancy impacts how much harm the pest may cause. Their reproductive rate also indicates the intensity of an infestation.

House flies live for how long?

A typical house fly lives for around a month. Females can deposit five to six batches of eggs throughout that period. House flies breed all year, even though they are more active in the summer.

Fruit flies survive for how long?

A fly’s lifetime might also vary depending on the species. Fruit flies, for example, live slightly longer than house flies. These insects will expire after 40 to 50 days. During this period, they, like house flies, can produce numerous generations. A single female fruit fly may give birth to up to 500 progeny.

Why Do Flies Live For Such a Long Time?

Flies have four phases in their life cycle. Egg, Pupa, Larva, and Adult are the four stages.

The cycle begins with egg laying; a female fly may deposit almost 150 eggs in a batch or at a time. Flies’ eggs have the appearance of a grain of rice. Within a day, the cycle has progressed to its second stage, the larval stage, often known as maggots.

By three to five days, these larvae have progressed to the third stage of their life cycle, the pupa. Finally, the pupa matures into an adult fly after five to six days.

Food is a basic need for all living organisms. For example, flies are voracious eaters, consuming everything in their path. Flies can survive for roughly two to three days without food.

Only a small percentage of the flies survive to adulthood since the majority are eaten by predators or die in the first or second stages of their life cycle. Female flies may procreate and become adults after five days. They may produce a large number of eggs at once.

The temperature of the environment in which flies grow or develop affects the development of stages and the life cycle of flies. Flies may multiply quickly and in vast numbers. They usually deposit their eggs in warm, damp, dead, or rotting organic debris.

The flies’ survival is influenced by temperature. Any biological creature can only live in a specific temperature range. Similarly, flies can only live in a narrow temperature range. The table below shows the temperature range at which the flies can live –

What is the average lifespan of a fly?

How long do flies liveTime
Without foodNearly two to three days
Without waterNot more than 48 hours
Without airAbout four to eight hours


Flies, like other animals, play a crucial role in our ecology. The essential role of flies is to fight grasshoppers, caterpillars, and other insects that devour our food plants and damage or kill them, rendering the food unsuitable for eating.

Because flies have wings, they aid in pollination. They are also a member of the food chain. They are an essential food source for other animals, such as fish.

Flies in their larval stage, the second stage of their life cycle, can also operate as decomposers. Flies are constantly buzzing about, flying here and there. First, they fly on dead and rotting stuff, dung, etc. Then they settle on our food, making it unsanitary to consume. In addition, they may transmit germs and bacteria that can cause diseases such as typhoid, cholera, TB, etc.

Food should be kept covered; otherwise, flies might destroy it, and we never know where they are coming from.


Editorial Staff

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