Flying Ants in the House: Causes and What to Do

Finding flying ants in the house can be alarming, particularly when many appear within a short period. These insects are usually reproductive ants leaving a mature colony to mate and establish new nests.

A few flying ants entering through an open window may have come from outdoors. However, ants emerging repeatedly from a floor, wall, skirting board or window frame can indicate a mature nest inside or immediately beside the property.

The location, number of insects and pattern of activity will help you decide whether simple cleaning and monitoring are sufficient or professional ant control is needed.

What are flying ants?

Flying ants are not a separate species. They are reproductive male and female ants, sometimes called alates, produced by an established colony.

When weather conditions are suitable, they leave the nest in large numbers to mate. After mating, the males die, while fertilised queens shed their wings and search for places to establish new colonies.

In the UK, many summer swarms involve black garden ants. According to the Natural History Museum’s flying-ant guidance, swarming commonly occurs in warm, humid weather between June and early September, with activity often peaking during July and August.

There is no single national “flying ant day”. Different colonies emerge at different times according to local weather and conditions.

Why are flying ants in the house?

There are two main explanations.

They entered from outside

Flying ants may enter through:

• Open windows and doors

• Gaps around window frames

• Air vents

• Damaged insect screens

• Roof and soffit gaps

• Open skylights

Winged ants are often attracted towards light, so they may gather around windows even when the colony is outdoors.

A few insects found during a widespread summer swarm do not necessarily indicate an indoor infestation.

A colony is inside or beside the building

A nearby nest is more likely when flying ants:

• Emerge from one crack or joint

• Appear from beneath flooring

• Gather around a skirting board

• Come through a wall opening

• Emerge beside a window or door frame

• Reappear in the same room

• Are accompanied by ordinary worker ants

• Leave piles of discarded wings indoors

The nest may be beneath the floor, inside a wall void, below the foundations or immediately outside the building.

Does one flying ant mean you have an infestation?

No. One flying ant may have entered through an open window, particularly during warm summer weather.

An established indoor or nearby colony is more likely when:

• Large numbers appear indoors

• Activity starts from a specific structural gap

• Winged ants return on several occasions

• Worker-ant trails are already present

• Fine soil appears beside cracks or paving

• Ants have been active in the property for several weeks

• Discarded wings collect near windows

Record where the ants first appear rather than relying on where they eventually gather. Insects attracted to a window may have emerged from a gap on the opposite side of the room.

Are they flying ants or termites?

Termites are not established as ordinary household pests in the UK, so winged insects found in a Kent home are much more likely to be ants or another locally occurring insect.

Flying ants normally have:

• A clearly narrowed waist

• Bent or elbowed antennae

• Larger front wings than rear wings

• Dark brown or black bodies, depending on species

Other insects, including small wasps and flies, can sometimes be mistaken for flying ants. Take a clear photograph or retain one specimen safely if professional identification is needed.

Are flying ants dangerous?

Common flying ants do not present the same risk as wasps. They are primarily focused on mating and establishing new colonies rather than attacking people.

Some ant species can bite or release defensive chemicals when trapped or handled, but serious harm from ordinary UK garden ants is uncommon.

Their presence is mainly important because it may reveal a mature colony in or around the property. Ants can contaminate food, repeatedly enter kitchens and become difficult to control when the nest is inaccessible.

How long do flying ants stay in the house?

A swarm may last only a few hours, although smaller numbers can remain visible for a day or two.

Flying activity usually declines once the reproductive ants have left the colony. This does not necessarily mean the underlying nest has disappeared. Worker ants and the existing queen may remain active after the swarm has ended.

If flying ants emerge from the same location again, investigate the source rather than waiting for each visible swarm to stop.

What should you do when flying ants appear?

Remove the visible insects

A vacuum cleaner can remove flying ants and discarded wings without applying chemicals throughout the room.

Empty the vacuum outside afterwards and keep food preparation surfaces clean.

Close obvious entry points

Close windows and doors during an outdoor swarm where practical. Check screens and temporary openings, but do not immediately seal a structural crack if ants are actively emerging from it.

Blocking one active route can cause ants to appear elsewhere without eliminating the colony.

Follow the activity

Watch ordinary worker ants from a reasonable distance. Their trails may lead towards:

• Cracks beneath doors

• Gaps around pipes

• Kitchen units

• Patio edges

• Air bricks

• Floor joints

• External paving

• Areas containing food or water

Small piles of excavated soil can also indicate a nest entrance.

Remove accessible food

Clean sugary spills, crumbs and food residue. Store food in sealed containers and avoid leaving pet food out unnecessarily.

Cleaning can reduce foraging activity but will not destroy an established colony.

Should you use ant spray?

Aerosol sprays may kill visible insects but often fail to reach the queen and developing ants inside the nest.

Some ant colonies respond badly to unsuitable treatments. Pharaoh ants, for example, can divide into additional colonies when disturbed or treated incorrectly.

Avoid spraying unidentified ants throughout kitchens, wall voids or electrical areas. Do not mix pesticides or use a product anywhere not permitted by its label.

Professional bait treatments work differently. Worker ants collect suitable bait and carry it back through the colony, allowing treatment to reach insects hidden inside the nest.

The British Pest Control Association’s ant guidance recommends locating nest entrances and using an appropriately trained pest professional where control is required.

How to prevent flying ants from returning

You can make the property less accessible and attractive by:

• Repairing gaps around doors and windows

• Sealing appropriate cracks after activity has stopped

• Cleaning food and drink spillages promptly

• Keeping sweet foods in sealed containers

• Removing pet food after feeding

• Maintaining external paving and wall joints

• Repairing moisture problems

• Trimming vegetation that touches the building

• Monitoring recurring worker-ant trails

Proofing should be completed after the active route and nest location have been understood. Sealing ants inside a void does not eliminate the colony.

When is professional ant control needed?

Professional help is reasonable when:

• Flying ants repeatedly emerge indoors

• Large numbers appear from a structural gap

• Worker ants remain active after the swarm

• The nest cannot be located

• Ants are contaminating food areas

• Activity affects a restaurant or other business

• Several rooms are affected

• Previous treatments have failed

• Very small yellow or pale ants are present

• You are unsure which species you have

GEM Services provides professional ant control across Kent for residential and commercial properties.

Our fully insured, 5-star-rated team is based in Ashford and serves all of Kent. We provide fast, discreet appointments, with same-day attendance where possible.

We identify the ant, trace active routes and recommend treatment suited to the species and property. You receive honest advice without pressure, including when monitoring and basic proofing are sufficient.

Call 07400 372204 or request a free quotation.

Frequently asked questions

Why have flying ants suddenly appeared indoors?

A mature colony may be releasing reproductive ants in response to suitable summer weather. Alternatively, an outdoor swarm may have entered through open windows or doors.

Do flying ants mean there is a nest in the house?

Not always. A few may have flown indoors. Ants emerging directly from flooring, walls or skirting boards provide stronger evidence of a nest inside or beside the building.

Will flying ants go away on their own?

The visible swarm will usually end quickly, but the original colony may remain. Monitor for worker ants and further activity from the same location.

Should I seal the hole they are coming from?

Not immediately. First identify the route and deal with the colony. Blocking one opening may simply redirect the ants elsewhere.

Can flying ants damage a house?

Common garden ants do not normally cause major structural damage, but colonies can exploit existing cracks and disturb loose soil beneath paving.

Are flying ants attracted to light?

Yes. They may gather around windows and other bright areas after emerging, which can make it difficult to identify where they originated.

Why are there discarded wings near my window?

Mated queens shed their wings after the mating flight. Discarded wings can therefore indicate recent reproductive activity, although the ants may have entered from outside.