With the onset of the migrant crisis in Europe, irregular migration is becoming a significant security problem for European leaders and citizens. As a result, there has also been a change in the public opinion of European countries, because many citizens associate irregular migration with terrorism and other security problems. In line with the growing importance of irregular migration as a security problem, the research aimed to determine changes in migration trends in Serbia, that is, on the ‘Balkan route’ of migration since 2015, when the migrant crisis in Europe began. Results that can roughly indicate the profile of an irregular migrant found on the territory of the Republic of Serbia were obtained in this research, conducted between June and August 2020 on a sample of 50 irregular migrants. An irregular migrant is a person from Afghanistan, of Islamic religion, uneducated, and of a poor financial status. They want to go to Germany for money, and they cross the borders of the countries located on the ‘Balkan route’ on foot, occasionally using the services of smugglers. Additionally, they have no problems with the border police of Serbia. The conducted research can contribute to gaining new knowledge about the problem of irregular migration, primarily about the trends that are different than they were at the time of the migrant crisis in 2015. Unlike previous research, this research is unique in that it also refers to the work of the border police and the attitude of border police officers toward irregular migrants.