can i travel out of the united states with a pending domestic violence charge in colorado?

It is likely a condition of your bond that you not travel outside Colorado without permission of the court. Some counties have forms to use for that. If you are on 'pre-trial supervision' ask your pretrial supervisor about departing the state/country, and they can begin the process. Normally it takes a document that contains the position of the DA, any pretrial supervisor (if tehre is one) and then it goes to the Judge for their decision.