Online tickets not always available even if originating in DE
I just booked Cologne-London St. Pancras tickets on bahn.de and there was no choice for an online ticket, only by mail.
Originally Posted by
SmilingBoy
As far as I know, Online tickets are virtually always available if you use trains in Germany, or DB trains going abroad. Exception is if you start your trip abroad - so Brussels-Frankfurt-Brussels is not available as an Online-Ticket, whereas Frankfurt-Brussels-Frankfurt is.