There are several synonyms that can be used in place of the phrase "time of departure". One common synonym is "scheduled departure time". This phrase is often used in transportation contexts, such as when discussing airline flights or train schedules. Another synonym is "takeoff time", which is commonly used for airplane departures. In more formal settings, the phrase "anticipated departure time" may be used to denote the expected time of departure. Finally, the word "departure" itself can often be used in place of the full phrase, as in "What is the departure time for the train?