Bengtsson debuted for the Swedish U19 national team in a friendly against Scotland on 6 October 2016. About a month later, on 14 November 2016, he won his first competitive cap in an away qualifier against Serbia ahead of the 2017 UEFA European Under-19 Championship. Sweden won the game with a score of 3–2. Bengtsson was selected in the preliminary squad ahead of the tournament – but withdrew on request from his club, Hammarby, where he had started to play regularly.
