The journey between London and Vienna is best made overnight, although you can do it through the day if you would prefer. This page details the overnight option only.
There are three legs to the journey, starting with the Eurostar between London and Brussels, followed by a high-speed Thalys journey between Belgium and Germany. The final leg of the journey is made overnight between Cologne and Vienna.
Considering the number of possible train times involved, there are certain trains to catch in order to make this journey as quick and simple as possible:
London to Vienna:
London - Brussels (Eurostar)
Depart London St Pancras - 12.58pm (Mon-Sat, 11.57 Sun)
Arrive Brussels Midi - 16.05pm (Mon-Sat, 15.05 Sun)
Brussels - Cologne (Thalys)
Depart Brussels Midi - 17.28pm
Arrive Cologne Hbf - 19.15pm
Cologne - Vienna (EuroNight):
Depart Cologne - 20.05pm
Arrive Vienna - 09.04am (next day)
Vienna to London:
Vienna - Cologne (EuroNight):
Depart Vienna - 19.36pm
Arrive Cologne - 08.42am (next day)
Cologne - Brussels (Thalys):
Depart Cologne - 10.45am
Arrive Brussels Midi - 12.32pm
Brussels - London (Eurostar):
Depart Brussels Midi - 14.29pm (Mon-Fri), 13.49pm (Sat), 14.59 (Sun)
Arrive St Pancras - 15.26pm (Mon-Fri), 15.03pm (Sat), 15.56 (Sun)

