Yes, Puerto Rico is part of the US.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
Logically, once you are legally approved to stay in the United States legally as defined by the recent DACA provisions and have a proof of that approved status, you may travel within and to and from all U.S. States, territories and protectorates.
Yet, if the plane you are no diverts to an abroad location that may create an issue.
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Both counsel are correct however I would be concerned about departing the continental U.S. and risking a benefit that provides your ability to remain here in a period of authorized stay. Reducing the risk is always a pragmatic course of action.