Actually biathlon it's non-commercial kind of sport. Yes, may be they sell right to broadcast any tv-channels, but also IBU has a free live stream all races of world cup and world championship on their site https://www.eurovisionsports.tv/ibu/
Also, we finding broadcast on youtube, acestream and sopcast.
Exclusion - in several countries live broadcast don't work (Poland, Switzerland), but for majority - works. Choose any link and enjoy biathlon live stream.
We show you all events of BMW World Cup 2018-2019: Pokljuka, Hochfilzen, Nove Mesto, Oberhof, Puhpolding, Antholz, Canmore, Salt Lake City and Holmenkollen. Of course - world championship in Oestersund will be streaming.
You can watch broadcast also: European championship, Universiada (competitions for students), biathlon auf Schalke, and maybe final event IBU cup in Italy.
You can free see all kind of biathlon's races: sprint, individual competiton, pursuit, mass start, relay and mixed relay.