The most convenient way to get to Briksdalsbreen glacier is by car. If you’re driving from Oslo, you can take the E6 highway north towards Lillehammer, then follow the E136 and Rv15 towards Olden. The journey takes around 6-7 hours, depending on traffic and weather conditions.
Alternatively, you can take public transportation. There are regular bus services from Oslo to Stryn, with a change in the town of Otta. From Stryn, you can take a bus or a taxi to Briksdalsbreen.