Travel as young

Hi,i have a friend who bought an artwork from me, we thought of me delivering the work personally, however the cheapest flight prices I could find is around 350 euros. From oslo to munchen. Wich is a lot for a 18 year old. Especially only for a long weekend. If I chose to go it is the same date as Oktoberfest, would the experience justify the expensive tickets from people here’s experience? ( everything else is free since i would stay with my friend)