Here are several natural, non-toxic methods for controlling houseflies that are both environmentally friendly and easy to use at home:

Homemade Fly Traps
You can make effective fly traps using common household items. For example, an apple cider vinegar fly trap: Pour apple cider vinegar into a container and cover it with plastic wrap punctured with small holes. Flies are lured in by the vinegar smell and cannot escape. Another simple method is a mixture of sugar and dish soap: Place sugar, dish soap, and water in a shallow bowl. The sugar attracts flies, while the dish soap breaks the surface tension of the water, trapping them.

Essential Oil Fly Repellent
The rich scent of essential oils such as peppermint, eucalyptus, and lavender has a significant repellent effect on houseflies. Dilute a few drops of essential oil in water to create a spray and spray around doors, windows, and doorways. Alternatively, place cotton balls soaked in essential oil in areas where flies are active to create a natural barrier.

Natural Plant Fly Repellents
Some plants have inherent fly repellent properties. For example, inserting cloves into the flesh of a cut lemon or orange creates a citrus-clove scent that effectively repels flies. Additionally, planting herbs like basil, mint, rosemary, and lavender near windows and doorways not only beautifies the environment but also creates a natural fly-repellent hedge.

Fly trapping with sticky traps
Flypaper is a classic and practical physical control tool. Commercially available flypaper is ready to use, or you can make your own: coat cardboard with a sticky substance like honey or syrup and hang it in areas with frequent fly activity. Its stickiness traps flies, reducing their nuisance.