Looking to compare the price of a night train, w/sleeper, from Venice to Munich versus staying an extra night in Venice and taking a discount flight the next morning (family of four, traveling mid-week in August). Checked buchung.nachtzugreise.de to try to ballpark the cost of a night train, the "special prices" looked good but never seemed available regardless of the day/month I used. Looked like similar discounted prices were available on trenitalia.com, but I never actually completed the booking process so maybe at some point it would tell me "not available". Should I just assume we'll have to pay standard rates for the night train?
At trenitalia.com, I think you cannot book international routes more than 90 days in advance. (I know that it is 60 days for domestic routes.)
The fact that the special prices at the DB night train site don't show up may simply mean that they are already booked. I suggest you call the DB Call Centre, ask what is available, and book your tickets over the phone. Dial 011 (US international access code) + 49 (country code for Germany) + 1805 996633.
We just purchased our June night train tickets from Venice to Zurich (via Bologna Centrale) on www.trenitalia.com. The Trenitalia price for 2 people was 170 Euro as compared to RailEurope's $340...avoid Rail Europe whenever possible.