To be deported or to experience deportation means to be forced to leave an area that you are in and go back to where you came from. Along with their similar dictionary definitions, their dream meanings are also quite similar.
Dreaming of departure means that you are getting ready to leave one part of your life behind and move on to the next. You have been going through a lot of different things recently and you have gone through a lot of changes. You have made a ton of progress and now you are ready for the final step. You are ready to judge your own progress and move on to the next level of your life, whatever that level is.
Dreaming of deportation or being departed means that you are a bit out of your element to the point where you feel like lately you have been in a strange land. You do not feel like yourself and this is one of the most important things to pay attention to. If you feel this way you need to move out of it and come to terms with yourself more easily.