Blichfeldt started to play badminton at the Solrød Strand badminton club at the age of nine, and began playing competitively at the age of eleven. She made her international debut in 2013, representing her country at the
2013,
2014,
2015 World Junior Championships, and
2014 Summer Youth Olympics. She won the gold medal at the
2015 European Junior Championships in the girls' singles event, also helping her team take the bronze. At the age of sixteen, she claimed her first international title at the 2013
Norwegian International, beating top seed
Olga Golovanova of Russia in the final. In 2014, she won the
Danish National Championships. In 2017, she reached the final of the
Scottish Open, but lost in the final to host player
Kirsty Gilmour with a score of 21–23, 12–21. In 2018, Blichfeldt reached the semi-finals of the
European Championships, but was stopped by the host player and 2016 Olympic gold medallist
Carolina Marín, thus having to settle for a bronze medal. At the same year, she won her first Super 100 title at the
Dutch Open, when she defeated
Qi Xuefei with a score of 21–16, 21–18. In 2019, Blichfeldt won the
Spain Masters, a Super 300 tournament, by beating compatriot
Line Kjærsfeldt with a score of 21–14, 21–14 in the final. She clinched the gold at the
2019 Minsk European Games, defeating Scotland's
Kirsty Gilmour with a score of 21–16, 21–17. At the
2019 BWF World Championships, she made her first-ever World Championship quarterfinal by beating eighth seed
Saina Nehwal in the Round of 16. However, she lost in the quarterfinals to the Chinese fourth seed and eventual bronze medallist
Chen Yufei. In 2020, Blichfeldt along with the Denmark team won the
2020 European Women's Team Championships. In 2021, Blichfeldt competed in the
2020 Tokyo Olympics, where she was seeded thirteenth. She topped her group in the Group Stage, beating Bulgaria's
Linda Zetchiri and Australia's
Chen Hsuan-yu, to make the Round of 16. However, she lost in the Round of 16 to the then reigning World Champion and eventual bronze medallist
P. V. Sindhu of India. She also represented
Denmark at the 2024 Summer Olympics. In January 2026, during the
India Open, Blichfeldt criticized the condition of the
Indira Gandhi Arena in
New Delhi. == Achievements ==