I bought a couple of these for around the house. https://a.co/d/5vjsVs3 Works very well but mostly at night.

Also to make sure you regularly do the dishes, take out trash and clean up any food sources for the flies. After using the above and doing the above, mine went from insanity to maybe 1 or 2 around the house in about a week or two.

I open a window and they fly to it. Then I shut them out.

A clear plastic cup and a paper card large enough to cover the opening.. Wait for the fly to land on a window, and approach slowly with the cup while distracting them with your other hand. When close, cover the fly by pressing the cup on the window and slip the card underneath the opening. It helps if the fly has tired itself out first. Works well for all manner of bugs.