Yes, it is possible to run a free arrest warrant check.
Visit Official Government Websites
The best way is to go to the city, state, county, or federal website where you think you might have a warrant. Official websites will end in .gov. Each of these government websites will have a search function for people with outstanding warrants. One reason why going to these official government websites is the best option is because the information is kept up to date. Another reason why internet searches are the best is because internet searches are anonymous.
Some sites will have a search function where you just type in your name and see if a warrant comes up. Other websites will have a link to click on that will bring up everyone who has a warrant out for their arrest in the area. Some of the less densely populated areas or smaller towns may not have this information available on their website.
Another free way to find out about outstanding warrants is to call the city, county, or state offices and ask if there is a warrant out for your arrest. If you place the call for yourself from your own phone, the police may be able to locate you. They could track the phone number to a location from its signal or any billing address attached to the telephone number. You can always have someone else call for you.
Law Enforcement Officer
If you are ready to turn yourself in, a free way to run a warrant check is to stop any law enforcement officer and ask them to run a warrant check on you.
Most other options are not free. If you do a search for free warrant search on a search engine, you will see that there are third party commercial websites who collect all the data on an individual. You can purchase their report but there is no guarantee there will be an arrest warrant listed. These sites pull data from a variety of sources and provide vital statistics, property ownership information, driving records, and other personal details. Since you never know what you will get with these reports, these sites are not the best option to use for a warrant check.