Puerto Rico is a US territory. Technically you should have no issues traveling there if you came to the States on a K1 visa. Perhaps you plan a honeymoon in Puerto Rico or perform some other traveling before adjusting your status. This should not pose an issue as you don't cross through customs in most cases. If you're taking a cruise and going to be leaving the US, that could become an issue, as you couldn't re-enter. The K1 visa is a single-entry visa. You won't, however, be able to leave the US and re-enter on a K1 visa.
Disclaimer: The contents of this post were accurate to the best of our knowledge at the time of publishing. Immigration is constantly changing, and old information often becomes outdated, including procedures, timelines, prices, and more. Take note of the publish date. For archival purposes, these posts will remain published, even if new information renders them obsolete. Do not make important life decisions based on this content. No part of this post should be considered legal advice, as RapidVisa is not a law firm. This content is provided free of charge for informational purposes only. If anything herein conflicts with an official government website, the official government website shall prevail.
