Jonna Sundling established herself as a formidable force in cross-country skiing early in her career, securing gold medals at the Junior World Championships in 2013 for the 4 x 3.33 km relay. Her dominance continued at the 2014 Junior World Championships, where she earned two additional gold medals in individual sprint and the 4 x 3.33 km relay. Progressing into the U23 category, Sundling captured another gold medal in individual sprint at the U23 World Championships in 2016. Joining the Piteå Elit club, she made her full World Cup debut, consistently achieving podium finishes in individual and team sprint events over several seasons as she climbed the international ranks.
Throughout her career, she has accumulated 12 individual World Cup victories and 39 podium finishes, alongside 7 team victories across relays and team sprints. Her consistent performance has ensured her position within the top contenders in the World Cup overall and sprint standings, showcasing ongoing excellence in her discipline. Looking ahead, Jonna Sundling continues to underscore her dominance in cross-country skiing, with multiple medals forecasted for the upcoming 2025 FIS Nordic World Ski Championships in Trondheim. Projections include gold medals in individual sprint, team sprint, and the 4 x 7.5 km relay, alongside a bronze medal in the 20 km skiathlon, demonstrating her continued presence as a top-tier competitor in the sport.