"Sooner or later" is a common phrase used to describe something that will happen eventually. However, there are numerous synonyms that can be used to convey the same meaning. One alternative is "eventually," which implies that something is bound to happen at some point in time. Another option is "ultimately," which suggests that there may be several steps or obstacles that need to be overcome before the desired outcome is achieved. "In due time" is another phrase that can be used to indicate that something will happen at the appropriate or expected time. Other synonyms include "inevitably," "gradually," "consistently," and "steadily." Ultimately, the choice of synonym depends on the context in which it is being used.