Well, Marcel, what it really depends on is to what extent your plans to go s_____arding are fixed, or not.

The present progressive is used for plans and arrangements that are pretty well definite and fixed. So, if I say I am going to the doctor tomorrow, this means that I have an appointment, or that there is absolutely no doubt in my mind that I will do this. I am going to go to the doctor tomorrow means that I am planning to do so, I intend to do so - but I am less certain about it.

So, in my case, I would say I am flying to Hungary next month because I already have the ticket. But I would say I am going to go to Italy for my summer holiday this year because in fact I've not finalised my plans and may yet change them.

See also:
JustSomeLyrics
105
105.108
Christian artist Semua baik Lyrics
Claudio Baglioni QUEL GIORNO Lyrics