How To Get Rid Of Cluster Flies?

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Cluster flies can be a big-time nuisance once they make their way into your house, due to which it is essential to know how to get rid of cluster flies. Let us take a look.

What is a cluster fly?

Cluster flies are a type of fly that is common in North America. They derive their name from the habit of clustering together in large numbers. These flies are often mistaken for house flies. However, that is incorrect.

how to get rid of cluster flies

They are annoying because they tend to come into homes in big groups, but they are easy to get rid of if you are patient. The fly’s wingspan is wide, so it can be easy to identify.

These flies are about ¼ to ⅜ inch long, and they don’t have metallic coloration like the bluebottle fly. They can be identified by their golden yellow thorax and black abdomen.

Although their bites don’t cause as much discomfort as those of the bluebottle, they may still trigger an allergic response in some people.

Moreover, cluster flies spread diseases by coughing and sneezing, so it’s important to take steps to get rid of them if they are found in your home.

The cluster fly life cycle

Fly on a rotten Apple

Cluster flies go through a four-stage life cycle. In the first stage, eggs are laid in late winter or early spring. The eggs hatch into larvae, which feed on organic matter such as decaying plants or manure.

Once they have reached their full size, the larvae pupate and emerge as adults in late summer or early fall. Adult cluster flies eat flowers and other plant material during the summer months before dying off in the winter.

The larvae eat earthworms as food for 23 days, and then they go into the pupae stage for about 11 days before emerging as adults.

The entire Cluster fly life cycle lasts around 4-5 months.

Why do I have cluster flies?

Cluster flies are attracted to warm areas, like homes in winter. They come inside to escape the cold weather.

They hibernate in large groups and will take shelter in any voids or crevices they can find. Once it warms up outside, they will fly out and look for food.

Cluster flies are more commonly found in residential areas during the winter season. They tend to migrate into homes and buildings.

While they are not harmful, they can be a nuisance as they tend to cluster around the window and light fixtures. There are certain things you can do to get rid of them, including using a trap or pesticides.

What do cluster flies eat?

Close up view of a flesh fly on the nature.

Cluster flies are attracted to earthworms while they’re in the pupae stage. It is during this time that the cluster fly will eat the most, as they need the nutrients in order to develop into an adult fly.

After the larvae turn into adults, cluster flies will eat pollen and nectar from flowering plants. They are not known to cause any damage to crops or stored products.

Are cluster flies dangerous?

Cluster flies aren’t really dangerous to humans. They might invade your home in large numbers, but they don’t pose a threat.

These flies are not dangerous in the sense that they will bite or sting humans, but they can contaminate food with bacteria.

How to get rid of cluster flies?

cluster flies

Using these methods, you may naturally get rid of cluster flies. Be patient and keep going till they’re all gone!


There are certain measures you can take to help prevent cluster flies from invading your home. Some tips include: keeping your house clean, sealing up any wall voids or cracks, or openings in your home, and using screens on windows and doors.

Eliminate the current problem. This means finding and getting rid of their breeding grounds, which can be difficult because they tend to be hidden. You can also use traps or repellents to try and get rid of them.


Purchase a high-quality vacuum cleaner.

Vacuum up any and all cluster flies you find around your windows, doors, or other locations with this. This will not solve the problem, but it will lower the overall population. This is the initial stage, and it will annihilate a large portion of the population.

Don’t forget to vacuum up any flies that are hiding in the gaps with the vacuum.

Vacuuming your house on a regular basis should be an apparent plan of action when attempting to remove cluster flies. This will prohibit them from settling in new regions while also keeping your home free of other household pests.

Destroy their breeding areas

Cluster flies are a slow but persistent pest. They will attempt to migrate away from the areas you’re cleaning, so it is important to be thorough in your efforts. You will need to destroy their breeding area in order to get rid of them for good.

These flies breed in moist, dark areas, so keeping your house clean is the best way to get rid of them. Disposing of their breeding area will also kill the current generation of flies and stop them from infesting your home.


Vinegar is a versatile cleaning agent. It can be used to clean around trash cans and garbage dumpsters, as well as other areas where flies might congregate. In addition, vinegar also has the added benefit of being a natural deterrent to flies.

Cluster flies are attracted to moist, organic materials. They can be found near leaks from trash bags and around the bottom and sides of garbage disposals.

In order to get rid of cluster flies, it is important to remove their food sources and seal any cracks or openings where they may enter your home.

Cleaning up clutter

Clutter provides pests with a place to live and breed. By cleaning up your home, you can make it harder for them to survive. This will help reduce the population of pests in your home and may help get rid of them completely.


Bleach is a great cleaning agent for all sorts of surfaces, including trash cans. It helps to eliminate any dirt or residue and leaves the surface clean and sanitary.

One way to kill them is by using bleach. Bleach will kill cluster flies on contact. It is important to read the label and follow all instructions when using bleach.

Fly strips

Fly strips are an effective way to reduce the population of flies in your home. They work by trapping the flies on the strip and eventually killing them. You can find fly strips at most stores that sell household supplies.

It is important to monitor how effective the fly strips are at reducing the population of flies. One way to do this is by using fly tape.

Fly tape can be used to catch and track the number of flies that are present in an area before and after the installation of fly strips.

Light fixtures

Cluster flies are attracted to light fixtures because they provide warmth. They are also attracted to warmth signals, like those given off by spring, which is why they are commonly seen around light fixtures during the winter months.

You can use this to your advantage by placing traps near the lights. These traps will vacuum up the flies when they fly into them.

Using sprays

A Residual spray is a common way to eliminate cluster flies. These sprays are applied to surfaces where the flies will come into contact with it, and the active ingredient will kill them.

These sprays are applied in areas where the flies tend to congregate, such as outdoors and at entrances to buildings.

There are various types of residual sprays available, so be sure to do your research to find the right one for your needs.

Stopping cluster flies from returning

Defocused nature macro background with a green fly on the white flowers close up. Summer, blossom season concept. Floral nature background, card, banner.

Cluster flies are a common pest here in the United States. They can be difficult to get rid of and often return if the underlying problem that attracted them in the first place is not fixed.

There are certain measures you can undertake to prevent cluster flies from returning, including repairing any damage to your property, fixing any leaks, and making sure there is no food or water source for them to feed on.

Cluster flies are pesky insects that tend to invade homes in the colder months.

Check common areas for fly entry and seal any cracks or openings. You can also use sprays to prevent breeding.

Stop them from getting into your property.

Cluster flies are attracted to dark, warm places and should be prevented from entering by sealing up openings on all sides of the home. This includes cracks in the foundation, around windows and doors, and anywhere else they could potentially enter.

They tend to breed in large numbers and can quickly infest a property. In order to stop them from getting into your home, you need to seal up any gaps or cracks in the exterior and interior of your house. You can also use traps and pesticides to get rid of them.

Check upper floors

Cluster flies are attracted to spaces that are dark, quiet, and warm. This means that you should check upper floors and attic spaces for these pests before they become a problem.

They often enter homes through cracks in the walls or windows and can be difficult to exterminate. One way to help keep them out is to seal up any cracks or openings in your home.


Cluster flies are a type of fly that can cause an infestation in houses. They are usually found near windows or in dark, moist areas. If you have a cluster fly infestation, there are a few things you can do to get rid of them.

Prevention is key when it comes to cluster flies. By using residual insecticide to seal up cracks and prevent flies from entering the house, homeowners can keep these pests at bay.

There are several ways to control cluster flies. Trapping and destroying them is one option, as well as using pesticides indoors.

About the author

A biotechnologist by profession and a passionate pest researcher. I have been one of those people who used to run away from cockroaches and rats due to their pesky features, but then we all get that turn in life when we have to face something.