The scheduled time when a vehicle (train, plane, bus, etc.) departs; the time shown on timetables or announcements.
出発時刻を確認して、30分前に空港に着いた。
I checked the departure time and arrived at the airport 30 minutes early.
電車の出発時刻は掲示板でご確認ください。
Please check the departure time of the train on the display board.
出発時刻が遅れているため、待合室で待つことになった。
Since the departure time was delayed, we had to wait in the lounge.