If you want to find out whether you have a warrant in Las Vegas, one resource you can check is:
You should also seriously consider retaining a Nevada criminal defense lawyer if you think that law enforcement in Nevada is looking for you.
Many good online search sites can answer the question as to whether or not you have a warrant outstanding. Even the San Diego Sheriff's website has outstanding warrants and can be checked. Generally, you want to check a statewide website, not just Las Vegas.
But, here's the twist: there may not be a warrant but there could be an old case on which you failed to appear or have some other problem outstanding, and a warrant was not issued. That could come back to haunt you some day.
Be careful. If you just want a yes or no answer as to whether there's a warrant, that is easy. If you want to know the status of a case, that is far more complex.