The phrase 'trip to infinity' can be substituted and expressed in several ways. Some synonyms that could be used for this phrase include journey to infinity, excursion to infinity, voyage to infinity, trek to infinity, jaunt to infinity, and expedition to infinity. All these phrases encapsulate the idea of a limitless travel experience that goes beyond conventional boundaries. The phrase 'trip to infinity' can be used in different contexts, including science fiction, philosophy, and spirituality. The synonyms for this phrase can be used interchangeably to create a more evocative and creative description of the idea behind the journey to infinity.