“Before departure” is a common time expression. “Of departure” is not usually used alone after departure and normally appears inside a longer phrase such as “time of departure” or “date of departure.”
Use “before departure” to talk about a time earlier than leaving. “Of departure” is generally not a complete natural phrase by itself, but it can appear after another noun, such as “time of departure” or “gate of departure.”
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use this phrase to describe something that happens earlier than a scheduled trip or exit.
Use “from” after departure to show the starting location.
Use “for” to show where someone is going.
Use “of departure” after another noun such as “time” or “date.”
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
“Of departure” normally needs another noun before it.
✕ We met of departure. ✓ We met before departure.Use “from” for the place you leave and “for” for the destination.
✕ Their departure for Paris Airport was delayed. ✓ Their departure from Paris Airport was delayed.Phrases like “time of departure” usually need an article or determiner.
✕ Please tell me time of departure. ✓ Please tell me the time of departure.Choose the expression that matches the intended meaning.
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It is correct only inside a larger phrase such as “time of departure” or “date of departure.” It is not usually used alone.
It means earlier than the moment of leaving or starting a journey.
Use “departure from” for the place you leave and “departure for” for the destination.
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