Mainstream Science Fiction Flash Fiction

Agita Noun. A feeling of agitation or anxiety. Agita is a project of From Beyond Press. It is a magazine for flash horror and dark sci-fi. Each issue will contain three flash stories and an essay around a chosen theme
Genres:   Horror, Science Fiction.
Lengths: Flash Fiction.
Payment: Professional. Details: USD $0.05/word.
Avg. Response: Faster than average responder. 13.8 days.
Acceptances: Average. 7.7% of fiction submissions accepted.

Bullet Points publishes speculative military fiction that is sensitive to the complexity, tragedy, and hope of warfare and violence in human (and nonhuman) society. Stories are considered military in nature when they explore some aspect of organizing or managing violence, be it before, during, or after war.
Genres:    Fantasy, Horror, Science Fiction.
Lengths:   Flash Fiction, Short Story.
Payment: to Semi-pro to Professional. Details: USD $30 for original stories; $20 for reprints.
Avg. Response: Faster than average responder. 38.7 days.
Acceptances: Approachable. 14.8% of fiction submissions accepted.

Flash fiction stories every month: one Horror, one Sci-Fi. Emailed exclusively to our newsletter readership for one month, then we’ll release them on the website.
Genres:    Fantasy, Horror, Science Fiction.
Lengths: Flash Fiction.
Payment: Professional. Details: GBP £0.06/word.
Avg. Response: Faster than average responder. 21.2 days.
Acceptances: Challenging. 3.7% of fiction submissions accepted.

High tech, high church. A literary magazine on the intersection of faith and sci-fi. Incensepunk is, at its core, a genre of longing. It desires a world in which traditional faiths and churches play a major role in society. Incensepunk extrapolates Byzantine and Gothic architecture styles into a modern world of skyscrapers and globalization. However, it is not regressive. It doesn’t view the past as good and the present as wicked and depraved…
Genres: Science Fiction.
Lengths:   Flash Fiction, Short Story.
Payment: Semi-pro. Royalties. Details: USD $25 for original flash fiction; $100 for original short stories; $25 for story reprints; no pay for flash fiction reprints.
Avg. Response: Average responder. 84.1 days.
Acceptances: Average. 7.2% of fiction submissions accepted.

Just Keep Up Magazine is an online magazine founded in November, 2024. We are devoted to science fiction and horror. We also feature horror and sci-fi poetry and book and film reviews. Some of the poems we have published could be called fantasy by a discerning reader, as well.
Genres:   Horror, Science Fiction.
Lengths:   Flash Fiction, Short Story.
Payment: to Token to Professional. Details: USD $10.
Avg. Response: Slower than average responder. 95.6 days.
Acceptances: Challenging. 4.8% of fiction submissions accepted.

Radon is a journal publishing prose and poetry relating to science fiction, anarchism, transhumanism, and dystopia. Radon nominates its writers for nearly a dozen awards. They include the Pushcart Prize, Best of the Net, O. Henry Prize, Best Microfiction, PEN/Dau Short Story Prize, Best Small Fictions, New Weird Horror Award, Best Horror of the Year, and Best New Poets.
Genres: Science Fiction.
Lengths:   Flash Fiction, Short Story.
Payment: Semi-pro. Details: USD $0.025/word.
Avg. Response: Faster than average responder. 13.5 days.
Acceptances: Challenging. 2.9% of fiction submissions accepted.

Sci Phi Journal is a cosy waystation for travellers who, through no fault of their own, find themselves at the cosmic intersection between speculative philosophy, cultural anthropology and hard SF. The most recent incarnation of SPJ, as our gathering place is known for short, was launched in Australia back in 2014 by Jason Rennie, of erstwhile Sci Phi Show podcasting fame (or infamy), and helmed by Ray Blank through the stormy year of 2017…
Genres: Science Fiction.
Lengths:   Flash Fiction, Short Story.
Payment: Semi-pro. Details: EUR €0.03 for originals & €0.01 for reprints.
Avg. Response: Faster than average responder. 32.1 days.
Acceptances: Approachable. 20.6% of fiction submissions accepted.

1,000 words isn’t much, but it’s enough to craft a five-minute escape to another dimension, and that’s our goal. It's a busy world and you don't always have time to immerse yourself in a sprawling space opera spanning multiple tomes and thousands of pages. Fortunately, we bring you immersive stories, characters, and ideas you can read on your potty break. Sci-Fi Shorts has been publishing flash fiction from authors around the world since 2020…
Genres: Science Fiction.
Lengths: Flash Fiction.
Payment: to Token to Professional. Details: USD $10per story; one story per month is selected to receive $100.
Avg. Response: Faster than average responder. 6.8 days.
Acceptances: Approachable. 44.1% of fiction submissions accepted.