Every summer, usually on a warm and humid day between June and September, millions of winged ants emerge simultaneously across the UK. This event — often called "flying ant day" — is actually the mating flight of black garden ant colonies. It is one of the most common pest-related queries we receive.
This guide explains what flying ants are, why they swarm, whether they are dangerous, and when a swarm indicates a problem that needs professional treatment.
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What Are Flying Ants?
Flying ants are not a separate species. They are the reproductive members of an existing ant colony — new queens (larger, with wings) and males (smaller, also winged) — that emerge from the nest to mate and establish new colonies.
Key facts about flying ants:
Queens are 15mm+ with two pairs of wings — much larger than normal worker ants. After mating, they shed their wings and search for a nest site.
Males are smaller with wings — they die shortly after mating. Their sole purpose is reproduction.
Swarming lasts hours, not days — a mating flight typically lasts a few hours on a single warm, humid day. The ants disperse quickly afterwards.
They do not bite or sting — flying ants from black garden ant colonies are completely harmless. They are focused on mating, not feeding.
They are food for birds — seagulls, swifts, and starlings feed heavily on flying ants during swarms, which is why gulls can behave erratically on flying ant day.
Why Do They All Appear at Once?
Colonies across a wide area synchronise their mating flights to maximise the chance of queens mating with males from different colonies, ensuring genetic diversity. The trigger is weather — they emerge when conditions are warm, humid, and calm, typically after a period of rain followed by sunshine.
This synchronisation is why "flying ant day" can seem so dramatic — thousands of colonies in a neighbourhood all release their winged ants within hours of each other. In reality, flying ant season can last several weeks, with multiple emergence events on different days.
Are Flying Ants Dangerous?
Flying ants from black garden ant colonies are harmless. They do not bite or sting, they do not damage property, and they do not carry significant disease risk. The swarm itself is short-lived — typically lasting just a few hours to one day.
However, flying ants are a nuisance. They are attracted to light and can enter homes through open windows and doors in large numbers. They are also a food source that attracts seagulls, which can cause additional problems in urban areas.
Flying Ants Indoors — When to Worry
A one-off appearance of flying ants near windows during summer is normal — they are being attracted to the light from an outdoor nest. This does not require treatment.
You should be concerned if:
Flying ants appear inside repeatedly — multiple emergence events over several days or weeks suggest a nest inside your building, not an outdoor swarm entering through a window.
They emerge from walls, floors, or skirting boards — if you can see winged ants coming out of a crack in the wall or from under the floorboards, the colony is nesting within your property structure.
They appear outside the normal season — flying ants in winter or early spring in a heated building may indicate Pharaoh ants, which swarm year-round indoors.
Large numbers appear suddenly — a mass emergence of hundreds of winged ants inside a room indicates a mature colony very close by that needs professional treatment.
Need professional help with ant control? BuzzKill Pest Control offers fast, effective treatment with no call-out charge.
Flying Ants vs Flying Termites
People sometimes worry that flying ants could be termites. Termites are not established in the UK, so this is extremely unlikely. However, the differences are easy to spot:
Flying ants have a narrow, pinched waist, elbowed antennae, and two pairs of wings where the front pair is noticeably larger than the rear pair. Termites have a thick, straight waist, straight antennae, and four wings of equal size. If you are in the UK, you have flying ants — not termites.
How to Deal With Flying Ants
For a normal outdoor swarm, no treatment is needed. The event is temporary and the ants will disperse within hours. To reduce the number entering your home:
Close windows and doors — the simplest and most effective measure. Flying ants are attracted to light, so closing up during swarms keeps them out.
Turn off unnecessary lights — if windows must stay open, switch off lights in those rooms to reduce the attraction.
Use a vacuum cleaner — for flying ants already inside, a vacuum is the quickest way to remove them without mess. Empty the bag or canister outside afterwards.
Do not spray — aerosol insecticides are unnecessary for a temporary swarm and will not affect the colony. Save your money.
Sweep up dead ants — after the swarm passes, sweep or vacuum up any dead ants on windowsills and floors to avoid attracting other pests.
When to Call a Professional
Call a professional if flying ants appear indoors repeatedly, emerge from inside walls or floors, or appear outside the normal summer season. These signs indicate a colony nesting inside your property that needs targeted treatment.
For professional ant removal, visit our Ant Control page or call 0203 468 1999.
Frequently Asked Questions
When is flying ant day?
There is no single flying ant day. Mating flights happen on warm, humid days between June and September, often after rain followed by sunshine. Multiple emergence events occur across the season.
Do flying ants bite?
No. Flying ants from black garden ant colonies do not bite or sting. They are focused entirely on mating and are not aggressive. Red ant flying ants can sting, but red ant swarms are far less common in urban areas.
Will flying ants go away on their own?
Yes — if they are from an outdoor swarm. Mating flights last a few hours to one day. Close windows and doors and they will disperse naturally. If they are emerging from inside your property, the nest needs professional treatment.
Can flying ants damage my house?
No. Flying ants do not damage property. However, their presence indoors may indicate a colony nesting in your walls or foundations, which could be causing other issues like soil excavation beneath paving.
Why are flying ants attracted to my windows?
Flying ants are attracted to light. During their mating flight, they navigate towards bright light sources, which is why they congregate on windows and around outdoor lights.
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