How can I get rid of these flies in my house plants?

You need to repot the plants in fresh soil and spray the leaves over and under with a horticultural oil. That is harmless to animals.

Janet is right, and if you are unable to do them all in one session, quarentine the repotted and treated ones - another room, garage, somewhere to avoid possible cross contaminstion.

One of those electric fly sappers!

Are they fungus gnats? They tend to be in the soil and not eat your plants. I just use cinnamon, sprinkled lightly on the soil and that does the trick for me.

Fill an old glass jar halfway with cider vinegar, add three to five drops dish detergent and then fill the rest of the way up with hot water. The dish detergent will foam up and create bubbles that rise A little higher than the jar. They will be atracted to this and get caught in the bubbles. Rinse and repeat!

Hello Jan, This video may be able to help you. Just copy and paste in your browser.

http://www.hometalk.com/diy/grow/plants/plant-pests-aphids-mealybugs-how-to-control-them-28622744?se=fol_new-20170418-1&date=20170418&slg=782199684b8fb8c1d011eb8fd848eff3-9928891&post_position=1

Spray plants and soil around them with a mixture of Neem Oil & water; ratio 4/1. Your pets will stay away too. You'll understand once you open Neem oil. Trust me

Moth balls, do the trick, they will not kill them but they will stay away, Or grow some peppermint plants, insects cannot stand peppermint.

They live and reproduce in the top two inches of soil. Top your pots with two inches of clean sand. Let the top of the soil and sand dry out completely before watering again [except in plants that require a constant moist soil]. It take two weeks to break the reproductive cycle. I also got that yellow sticky cards. Cut them up into smaller squares and layed them on top of the sand in my pots. That caught a lot of the adult bugs.

If you can break the two week reproductive cycle, you can get rid of the little buggers!

i had those bugs one year and they got all through my house and bite us all summer. Put small bowls of Red apple cider vinegar with one drop of Blue Dawn and the bugs will be drawn into the liquid and die. I even had to put some under my beds!! the bites were awful!! This works, sometimes it takes a little time for them to be drawn into the bowls. Also, they seem to be drawn to the light of a table lamp so put a little bowl on your tables as well as around your plants. But re-pot the plants, they live in the soil!!!

Here is a post I wrote that might help you https://chascrazycreations.com/irish-spring-soap-and-flies/

Here's a post that might help - https://chascrazycreations.com/keep-pests-out-of-your-garden/