On 20 January 2018 he achieved silver medal of the 2018 Ski Jumping World Championships. In the three-part competition, he became the ski flying World Championships runner-up behind Daniel Andre Tande from Norway and beat German Richard Freitag in third part. It was the second medal in history for Poland in Ski Flying World Championships after bronze of Piotr Fijas in 1979. The next day, Stoch and his teammates Hula, Kubacki, and Żyła, won the first ever medal, a bronze, for Poland in ski flying in team competition.