You could try submitting to online literary magazines that specifically accept flash fiction. Some popular ones include 'Electric Literature' and 'Smokelong Quarterly'.
There are several places to submit flash fiction. 'Flash Fiction Magazine' is a popular choice. It showcases a wide variety of flash fictions from different genres. '101 Words' is also a good platform. As the name implies, they focus on very short flash fictions of around 101 words. Additionally, 'Brevity' is a respected publication that accepts flash fiction submissions.
First, find the appropriate platform or publication. It could be an online literary magazine or a writing competition website. Then, check their submission guidelines carefully. Usually, you need to format your flash fiction in a specific way, like using a particular font and line spacing. After that, create an account if required. Finally, upload your piece or send it via email as per their instructions.
Many writing competitions and anthologies also welcome submissions of short flash fiction. Check out websites like WritersDigest.com for ongoing opportunities. Additionally, some literary blogs might be interested if their theme aligns with your work.
You could try submitting to online literary magazines that specialize in speculative fiction. Some popular ones include 'Clarkesworld' and 'Lightspeed Magazine'.
You could try submitting to online literary magazines like 'The Flash Fiction Press' or 'Quick Tales'. They often accept submissions of literary flash fiction.