dep.

剑桥词典

written abbreviation for depart or departure (used in timetables to show the time at which a bus , train , or aircraft leaves a place )
离开；出发（depart或departure的缩写）
Flight BA174, dep. Rio de Janeiro 21.45. BA174 次航班21点45分从里约热内卢起飞。 返回 dep.