If you are flexible with your travel dates, always consider that you can buy extremely cheap train tickets if you avoid travelling in the weekends and if you choose to travel during the low season.
When travelling on such short distances, you can take into account also busses and carpooling options: with some luck you will find very cheap options, even if you book on short notice.
Which stations do the trains to Decs leave from?
You can take the train to Decs at Budapest-Déli or Kelenföld, which arrives at Decs.
How long to you need to get to Decs by train?
The first train to Decs leaves at 06:08, whereas the last one at 20:08. On average, the journey lasts 4 hours and 25 minutes, but with the fastest connections you will be in Decs in 2 hours and 38 minutes.