Quick answer
To get rid of house flies, take away the place they breed first, then catch the adults. A house fly can go from egg to adult in 7 to 10 days in warm weather, so a kitchen bin or a heap of wet waste left for a week is enough to start a new batch.
- Keep every bin covered with a tight lid and empty kitchen waste daily in summer.
- Put mesh on windows and a self-closing spring on the kitchen door.
- Use sticky fly paper or a sugar and vinegar bait trap for the flies already inside.
- Call a professional if flies keep coming back after a week of strict cleaning. The breeding spot is usually outside your flat.
Why flies keep coming back
The house fly (Musca domestica) is 6 to 7 mm long with four dark stripes on its back. According to the University of Florida's entomology department, each female can lay up to 500 eggs in batches of 75 to 150, and in warm conditions the eggs hatch in under a day. The maggots finish growing in 4 to 13 days and the pupa stage takes 2 to 6 days at 32 to 37 °C. That is why a fly problem in a Delhi summer can double within a week if the source stays in place.
Adult flies usually live 15 to 25 days, but without food they survive only 2 to 3 days. Females need protein to make eggs, so meat scraps, pet food and dirty dishes left in the sink keep the cycle going.
Killing the flies you can see does very little if the maggots in your bin or a nearby garbage dump keep turning into adults. Every lasting fix starts with finding the breeding spot.
Step 1: Find and remove the breeding spot
House flies lay eggs in moist, rotting organic matter. Research summarised by the University of Florida lists manure, fermenting vegetables and kitchen waste among the favourite sites, and notes that even soil with small amounts of rotting material can support maggots. Check these places in and around your home:
- Kitchen bins, especially the bottom of the bin where liquid collects.
- Wet waste bags kept on the balcony or outside the door before collection.
- Pet food bowls, pet litter and bird droppings on window ledges.
- Compost pits and potted plants watered with kitchen scraps.
- Open garbage points in the lane, colony dhalao or near a dairy or meat shop.
What to do: use bins with tight lids, wash the bin itself once a week, and do not keep wet waste overnight in summer. FSSAI rules for small food businesses ask for bins with a tight cover that are cleaned every day, which is a sensible standard for a home kitchen too.
If you see tiny flies hovering over the sink or fruit bowl rather than house flies, you are probably dealing with drain flies or fruit flies, which need different treatment. Our guide to drain flies, fruit flies and house flies shows how to tell them apart.
Step 2: Keep them out
- Mesh on windows and ventilators. Fine insect mesh is the single most effective barrier. FSSAI's hygiene rules for food businesses ask for windows and other openings to be fitted with net or screen for the same reason.
- Door closers. A self-closing spring on the kitchen or balcony door stops the door from staying open while you cook.
- Cover food. Flies feed on anything left out, then rest on walls and ceilings. Cover cooked food, fruit and pet food.
Step 3: Catch the flies already inside
- Sticky fly paper. Hang it near windows and away from food. It works for a few flies, not for a heavy infestation.
- Sugar and vinegar bait trap. A study on a dairy farm in Nebraska found that traps baited with a vinegar and brown sugar mix caught more house flies than other baits, mostly because of the acetic acid smell. At home, mix apple cider vinegar with a spoon of sugar and a drop of dish soap in a jar, and cover it with cling film punched with a few holes. The soap breaks the surface so flies sink.
- Electric or UV traps. Useful in larger kitchens. Place them low on the wall and away from where you cook (see the placement rules further down).
Do home remedies work? What the evidence says
Most lists of fly remedies online are repeated from blog to blog without testing. Here is what published studies actually show.
| Remedy | What studies found | Our view |
|---|---|---|
| Vinegar and sugar trap | A vinegar and brown sugar bait caught more flies than other attractants in a 2013 field study. | Worth using. Plain vinegar alone was not what was tested. |
| Basil | In an ICAR study, flies avoided food treated with basil oil, and 0.25% basil oil reduced egg laying by more than 80%. | The oil works in a lab. A basil pot on the windowsill has not been tested. |
| Mint (peppermint) and lemongrass oil | In an IIT Delhi chamber study, menthol gave 90% repellency after one hour, and a mint and lemongrass blend did best among the oils tested. | A diffuser or spray can help near doors, but it repels rather than kills. |
| Camphor | Tested only as part of an oil blend. Its own effect was not reported. | Not proven on its own. |
| Hot pepper or ginger spray | We found no published test against house flies. | Not proven. |
| Fans | We found no study measuring this. | May keep flies off a table while it runs, nothing more. |
None of these remedies touch the breeding spot, so treat them as add-ons to Step 1, not replacements for it.
Why house flies are a health risk
Flies walk and feed on garbage, sewage and droppings, then land on food. They carry germs on their legs and mouthparts and pass them on when they feed or vomit. A 2018 review in BMC Public Health covering 99 studies identified more than 130 pathogens on house flies, mostly bacteria, including some that resist antibiotics. The University of Florida links house flies most often with outbreaks of diarrhoea and shigellosis, and lists Salmonella, E. coli and Campylobacter among the bacteria they spread.
When to call a professional
Call for help if you still see many flies after a week of covered bins and daily waste removal, if you run a kitchen, shop or food business, or if the breeding spot is outside your control, such as a neighbouring plot or a garbage point. Here is how a professional treatment differs from home methods:
- Source survey. The technician walks the building and the area around it to find where the maggots are, which is often a drain chamber, a shared bin area or a dumping spot.
- Light traps placed correctly. University of Florida guidance is one trap for about every 9 m of wall, mounted within 1.5 m of the floor, never above or within 1.5 m of a food preparation area, and left on continuously. Sticky board models are preferred in kitchens because they do not scatter insect parts.
- Baits and targeted spray. Fly baits go where flies feed, and a residual spray goes only on the surfaces where flies rest, such as walls near bins and ceilings near lights. Space spraying the whole house is rarely needed.
- Rotating chemicals. House flies have developed resistance to every major insecticide group, according to a 2020 review in the Journal of Medical Entomology. An ICMR study in Tamil Nadu found flies needed 3.5 to 3.9 times more dichlorvos to kill after repeated spraying. Good operators rotate products and lean on sanitation rather than repeating one spray.
For restaurants and food businesses, FSSAI rules also say spraying should not be done during business hours. Our guide to FSSAI-compliant pest control for restaurants covers the full requirement.
SKUAS Pest Control treats flies for homes and businesses across Delhi NCR and the Chandigarh tricity. Book a free inspection and we will find the source before we treat.
Frequently asked questions
How long does it take to get rid of house flies?
If you remove the breeding spot, the number of flies should drop within a week or two, because adults live only a few weeks and no new ones replace them. If flies are still rising after that, the source is somewhere you have not found yet.
Why are there so many flies in my house suddenly?
A sudden rise usually means a new breeding spot close by: a bin left uncovered, a bag of wet waste on the balcony, or a garbage point, dairy or meat shop nearby. Flies develop fastest in warm weather, so numbers jump in summer and the monsoon.
What is the best home remedy for flies?
Covered bins and daily waste removal, then a sugar and vinegar trap for the flies already inside. Mint or lemongrass oil near doors can help keep them out. The rest of the popular remedies have little or no published evidence.
Are fly sprays safe to use in the kitchen?
Do not spray over food, plates or cooking surfaces. If you use an aerosol, cover food, leave the room for the time printed on the label, and wipe food surfaces afterwards. For a heavy problem, targeted professional treatment uses far less chemical than repeated aerosol use.
Sources
- Sanchez-Arroyo H, Capinera JL. House fly, Musca domestica. University of Florida IFAS, EENY-048: journals.flvc.org/edis/article/view/138696
- Khamesipour F et al. 2018. A systematic review of human pathogens carried by the housefly. BMC Public Health: PubMed 30134910
- Qian K et al. 2013. Vinegar and brown sugar bait for house flies. J Econ Entomol: PubMed 23786090
- Senthoorraja R et al. 2021. Basil oil and house fly behaviour (ICAR NBAIR): PubMed 33963471
- Chauhan N et al. 2018. Essential oil repellency against house flies (IIT Delhi): PubMed 29197060
- Hubbard CB, Gerry AC. 2020. Insecticide resistance in house flies. J Med Entomol: PubMed 32516402
- Srinivasan R et al. 2008. Dichlorvos tolerance in house flies, Tamil Nadu (ICMR VCRC): PubMed 18036506
- FSSAI. Licensing and Registration Regulations, Schedule 4: fssai.gov.in compendium (PDF)