Budapest to Vienna

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How to get by train from Budapest to Vienna as cheap as possible?
Thanks in advance

Cheapest one way ticket Budapest-Vienna can be purchased for 13 euro (called Fortuna-ticket), but you need to buy it in advance and such tickets have limited availability (depending on train and time of departure)
Regular one way Budapest-Vienna ticket fare is 24 euro
You might as well consider purchasing domestic ticket Budapest-Mosonmagyaróvár (cheapest 2680 HUF) + EURegio ticket Mosonmagyaróvár-Vienna-Mosonmagyaróvár (12 euro)