I have a few different kinds of house plants which I enjoy very much but, there is an infestation of tiny black flies I'm pretty sure are thriving in the plants soil. could you let me know what would be a good natural remedy to use in the soil to help get rid of the flies?

Go to Search on this site and type in "Fungus Gnats" and click "ALL Dates" where you'll find different ways to control them. Keeping the soil dryer can help.