Leaving for another place
going, going away, departing, leaving, withdrawal, separation, embarkation, taking leave, sailing, emigration, hegira, evacuation, passage, setting out, setting forth, parting, leave-taking, farewell, takeoff, starting, congé, removal, retreat, flight, escape, abandonment, retirement, exodus, exit, egress, fade-out*, walkout*, getaway*; see also retreat 1.
Antonyms arrival*, landing, entrance.