@israel965 I ran into the same problem. I finally got the fonts working in “build” distros by providing relative paths from quasar/.quasar

So instead of src url(/fonts/OpenSans.ttf)
try src url(../src/css/themes/fonts/OpenSans.ttf)
obviously, customize the path to your font files, but keep them relative, not absolute

I will note this is probably only a good idea for local apps such as electron or mobile apps. Webpack will rename font files, so that cached versions of the fonts cannot be used, which, for a web site, will slow down time to load the initial page significantly.