Budapest - Vienna - Prague by train

Hi

I want to do the following travels by train:

Budapest to Vienna - May, 19 (around 6PM)

Vienna to Prague - May, 22 9 (around 10AM)

How much do the tickets cost? Can I buy them online? Is there any other way?

Thank you a lot

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Itinerary Planer of Austrian Railways ÖBB:

http://fahrplan.oebb.at/bin/query.exe/e

For the ticket ex Budapest I would contact the Hungarian Railway Operator MAV. Basically, you only have to show up at the station not too late and get your ticket.

Between Vienna and Prague there is also a bus service that runs on a daily basis.

http://www.studentagency.cz/

Regular rail fare to Prague is 49€, but ÖBB also offers highly discounted tickets that are subject to certain restrictions.