Fill out the immigration registration form 72 hours before your trip or up to one hour before. Do Checkmig. Checkmig.BLANK PASSPORT PAGES: One page required for entry stamp unless enrolled in Migración Automática, a program for frequent travelers. You need to fill out the Check Mig Colombia Form within 72 hours of boarding your flight. The latest you need the Check-MIG is 1 hour before your flight. The online Check-MIG Form (Check Migración Colombia) is a must-have travel document for anyone heading to Colombia. All British passport holders must complete the Check-Mig form for Colombia. Find out what this form is and how to get yours easily with OnTrailVisa. The Colombia Check-Mig Pre-Registration Form is a mandatory travel document for all travelers entering or leaving Colombian territory. You must fill in the 'Check-Mig' form between 72 hours and one hour before you travel to Colombia.