I open my window a small amount...

[SilverTongue]

Nuke your window from orbit and replace it with a letterbox

Then after this poo through said letterbox and as for the fly, kill it with fire.

Really though OP is it that difficult to work out how a small fly can fit through a small gap?

 

[Housey]

They don't like conkers, do they? Just put a few of those by your window.

Or is that spiders...?

Well, put some spiders by your window too.

Spiders and it works. Ive had 2 conks in my lounge and not seen a spicer of note for years!

 

[Hades]

Why can flies get IN a tiny window gap but can never find their way OUT?

 

[Housey]

Why can flies get IN a tiny window gap but can never find their way OUT?

Because they are house flies not outside flies

 

[Hades]

Because they are house flies not outside flies

You, sir, have a point there.

 

[Raymond Lin]

You smell.

 

[Kelt]

Help me, please help me!

 

[Hiijinx]

That's a pretty big fly.

Literally dropped my tablet reading that from laughing so hard, thank you for that.

 

[Junglist]

That's a pretty big fly.

Came to see a smart ass reply. Was not disappointed.

 

[timmeh]

I am clean,tidy and don't eat in my room.

That's all well n good but it's most likely the ******** in the corner of the room that's attracting them.

 

[CREATIVE!11]

They nest in your windows. I was infected a few years back, MILLIONS of them and I'm dead posh n owt and I have a cleaner, gardener and personal trainer but still I was a flea'ers

They could probably smell you.

 

[Housey]

They could probably smell you.

Id had a bath the year before, so probably not.

 

[Bunka]

Flies are attracted to cooler air and light. If at night you have the lights on, you'll attract a **** load of the buggers and eventually some of them will get in. If you're that bothered, a fly net or motion activated napalm will do the trick.

 

[opethdisciple]

By a basel plant and leave it on your window sill. Flies hate basel.

 

[Cosimo]

You should only be bothered if lots of them leave.

 

[Bunka]

By a basel plant and leave it on your window sill. Flies hate basel.

Are you suggesting the OP should move to Basel, Switzerland? Bit extreme...

 

[SPG]

Fly's like filth, you are filthy person and should be ashamed. Gd will destroy you.

 

[NexusK]

When you walk through a doorway there isn't much room between your shoulders and the frame...

 

[Moley]

Venus Flytrap and Pitcher plant on the window will take care of the problem and give you some nice greenery to look after.

 

[uvarvu]

https://www.amazon.co.uk/Sourcing4U-Executioner-Mosquito-Swatter-Zapper/dp/B003TT3GDC

Job done.