As of today ÖBB (Austrian Federal Railways) offers tickets for the new Brussels to Vienna and Innsbruck Nightjet service. Tickets can be bought online on tickets.oebb.at.

The first train will arrive in Brussels inbound from Vienna and Innsbruck on Monday the 20th of January and will head back to Austria the same evening. In the beginning there is only a twice weekly service, as of 2021 there should be a daily service to Vienna but no more coaches for Innsbruck.

Just like on other Nightjet services you can book your tickets up to 6 months before travel, with the cheapest seats starting at 29 Euros one way.