Most undocumented individuals are able to depart without issue. However, I have heard of individuals being detained and subject to an order of removal. You should retain proof of your return to Mexico including your travel itinerary, boarding passes, and passport stamps. It will be important if you wish to return in the future. Assuming you are over 18 and have been unlawfully present in the United States for at least a year, you will be subject to a ten-year bar to admission. This bar begins to run from the day you depart. You would need a waiver to return in less than ten years.
Answered on Apr 13th, 2016 at 3:37 PM