However, if you want to go Hamburg-Munich on an ICE (better than flying imo IF (!) everything works) and you do not have purchased a "BahnCard" and you do not book far in advance then it is very expensive.
2nd class ICE ride on that track in 2 weeks is 153€, flex, one way. For that money you get a return flight.
If you can be 100% sure to make it to one exact train you can go for ca. 50€. [1] Risk of failing to catch that train is pretty high though.
https://www.flixtrain.com/
However, if you want to go Hamburg-Munich on an ICE (better than flying imo IF (!) everything works) and you do not have purchased a "BahnCard" and you do not book far in advance then it is very expensive.
2nd class ICE ride on that track in 2 weeks is 153€, flex, one way. For that money you get a return flight.
If you can be 100% sure to make it to one exact train you can go for ca. 50€. [1] Risk of failing to catch that train is pretty high though.
[1] https://reiseauskunft.bahn.de/bin/query.exe/dn?revia=yes&exi...