Getting to the Danube cycle path in Hungary

Nearby international airports (most western first)

Vienna (10mi outside Vienna, Code: VIE)
Bratislava (7mi outside Bratislava, Code: BTS)
Budapest (6mi outside Budapest, Code: BUD)

Getting from Budapest to Vienna and Passau by train

There are several trains leaving Budapest towards Vienna. The Railjet (RJ) trains take bicycles, leaving from Budapest-Keleti station every two hours. You get the tickets and timetable information online here: www.oebb.at/en/

If you intend to cycle all the way from Passau to Budapest, look for trains from 'Budapest' to 'Passau Hbf.'. The journey is a bit over 5.5 hrs one-way.

Keep in mind that train tickets become available 92 days prior to departure - if booking online. You will also need a ticket for your bicycle (German: 'Fahrradkarte') as well as a reservation for it to go on the train.

Getting from Budapest to Passau by coach

Yes, there is one. Information will follow.