There are a variety of synonyms for the phrase "that's the ticket." Some phrases could include "that's it," "you've got it," or "perfect." Other phrases might include "just what I needed," "that's the cure," or "that's the solution." In general, these phrases all connote a sense of satisfaction or completion, implying that the solution or action at hand is exactly what was needed in a given situation. Overall, these synonyms for "that's the ticket" can be useful for expressing agreement, approval, or a sense of completion in a wide variety of contexts.