There are a variety of synonyms for the phrase "round trip," all of which refer to a journey in which both the departure and return legs are included. Some of the most commonly used synonyms include "return trip," "two-way trip," "there and back again," "round-journey," "circular journey," and "complete journey." Each of these phrases conveys the same basic meaning as "round trip," but may be used in different contexts or situations depending on the speaker's preferences or the specific circumstances of the journey. Regardless of which term you use, when planning travel it is important to consider both the departure and return portions of your itinerary to ensure a smooth and efficient trip.