How to Stop Nesting Flies Nesting in Window Frames

by | Last updated Jun 30, 2023 | Flies

Even if having the regular housefly visit in the summer is not a serious issue, flies’ accumulation can be an unpleasant experience.

They thrive throughout the year, exert the winter when they are likely to hibernate. However, what do you the rest of the remaining months of the year? Start by asking the right questions and suitable solutions.

How to Stop Nesting Flies Nesting in Window Frames

You have many options in this category, including using mesh structures, using aerosols, and more. Plus, it’s also good to know a few causes of flies nesting in that manner.

Let us get started.

Reasons Why Flies Nest on Windows

What is someone asks, “why are there lots of flies on my window.”

Well, as fall approaches, cluster flies begin to look for places they can hibernate in large numbers. They might seek shelter in areas such as the window, where they receive the warmth of the sun.

Plus, they also like the weatherproofed spaces and apertures that exist around the windows. Aside from the windows, the other places you are likely to find include attics, voids, ceilings, and more.

If you experience unusually warm weather in the spring, the cluster fly might emerge thinking that it’s the spring season.

They prefer well-lit places, which offer excellent conditions for the development of larvae.

Techniques for Stopping Flies from Nesting on My Window

Prevention is the best measure for when you want to stop flies nesting in window frames. Below are a few practical recommendations you should consider:

1.    Consider the Rules of Hygiene

The most common reason for flies inside the house is often due to rotten food, or just poor hygiene. It can be a good first step towards making your home free from flies:

  • Flies often make their way indoors because they are in search of something to eat. So, ensure you cover all your food and get rid of the unwanted ones.
  • Wet pet food, to be specific, can be a breeding ground for these unwanted guests. Consider giving pets small quantities of food each time, and remove their bowl once they are through. If you are not going to be close to your pet at home at all times, consider a battery-powered foot dispenser.
  • Ensure you clean dishes after use, and avoid leaving them for several hours around the kitchen or sink.
  • Remember to make sure that you cover all trash bins adequately, and they try to clean them at least once a week. The best product for cleaning the containers would be to use some bleach.
  • Store ripe and overripe fruit in a refrigerator. Keeping them in open spaces can easily attract flies into your house.
  • Clean any jars, bottles, and mats before storing them for later use.
  • Store your trash bins in a secluded place or an open space exposed to direct white light. It will help stop the flies from getting attracted to the trash bin.

Related reading Why Are Flies Attracted to Me?

2.    Artificial Fly Deterrents

You have many options in this category. However, proceed with caution as some of the measures can have serious long-term effects and are costly. A few good ones include

  • The first one would be spray insecticide. However, remember to use it sporadically and in a well-ventilated space. Never use the spray close to food or surfaces that are close to your windows.
  • Using flypapers is also another excellent measure. It works as a surface that helps capture flies. The best place to hang it would be on the window so that the flies can stick as they try to get through.
  • Furthermore, an electric or ultraviolet trap can also suffice. These are powerful mechanisms you can use to kill these pests as they make their way into the house.
  • Beaded curtains and mesh screens are also excellent preventative measures. Find the detachable types, which you can install without having to make significant adjustments to the window.

3.    Natural Fly Deterrents

Perhaps the best category for you in this set would be the natural deterrents. They are the simplest to use and are not associated with any significant side effects.  Below are some of them:

  • Grow herbs around the windowsill, which will act as natural deterrents. Consider plants such as mint and basil because plants cannot stand their presence. Plus, a few sprigs can also be an excellent addition to your work countertop surfaces.
  • Prepare your DIY flytrap, which you will set up close to the windowsill. You have many options in this category as well. We recommend that you go for a jar filled with sugar and a cone. It’s unique because it won’t let the insect fly out once they get through inside.
  • Using heated malt vinegar can also be an excellent measure for getting rid of flies from your kitchen fast.
  • Essential oils have also proven to be excellent deterrents for flies. Among the common ones to consider include lemongrass, eucalyptus, lavender, and peppermint.
  • You can also shop for various other essential oils online. The standard options you have include cloves and cinnamon.
  • Set up a plastic bag with some water on places such as windows and doors. These will be an excellent measure you can use to stop flies from getting through to your windows. Nobody seems to know why it works – but it’s highly effective.

Related reading How to Keep Flies Away from My Dog Kennels?

FAQ on flies nesting on windows

Why are There Lots of Flies on My Window?

This is because they like hibernating around well-lit areas or places that are weatherproofed, such as the window.

Plus, most windows have apertures and fixtures that provide excellent hiding spots.

Are There Any Health Risks of Flies Nesting in Window Frames?

Yes, there are a few health risks you should consider.

The flies living in the window can make their way to your food and transmit pathogens.

Why are there so many flies in my house all of a sudden?

It could be due to various reasons. The common ones include rotten food, animal carcasses, and poor hygiene.

Related reading What Causes a Lot of Flies in The House?


The presence of flies in your house should be a cause for concern. While it does not have any spiritual meaning, it’s still an unpleasant experience, and you should find ways of preventing their presence.

We have to take a look at a few options you can consider. These options are safe and straightforward to apply in any modern space.


Save $$$ by comparing up to 3 quotes from trusted local pest control companies.

Related reading Forum

Get Free Pest Control Quotes

Simply share a few details and the best pest controller near you will be in touch.