Lars Andreas Østvik contested his first successful race in the B-World Cup of Nordic Combined in 1997. In total, he was able to win four competitions in this series of competitions as well as the overall standings for the 1997/98 season.
Østvik made his debut in the Nordic Combined World Cup on March 21, 1999 in an individual competition in Zakopane, Poland . Here he took fifth place. His best season in the World Cup was the winter of 1999/2000 , in which he was 18th in the overall World Cup. That year, with a third place, he also achieved his only podium finish in the World Cup.