In 2015 Tikkanen finished second in Finnish Championship all-around competition. She was in the first place until the last rotation, where she got a knot in her ribbon. Tikkanen competed at the 2015 World Championships in Stuttgart finishing 35th in the All-around qualifications and did not advance into the Top 24 finals. Tikkanen competed in 2015 European Championships in Minsk, Belarus and finished 21st in all-around and 6th in team final with teammate Ekaterina Volkova.