Zurich is 90 minutes from Bregenz by direct train and serves as both the international gateway airport (ZRH) for Vorarlberg travelers and the natural western extension for anyone based in the Bregenz and Rhine valley area. The Altstadt, the Kunsthaus Zürich (recently expanded, major Expressionist and modern collection), and the Lake Zurich waterfront are the main draws. Swiss prices are roughly double Austrian levels at all categories. Plan 1-2 days. The Zurich-Bregenz-Feldkirch-Vaduz circuit is a natural western Austria extension if you are covering Vorarlberg seriously.
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Zurich
Zurich is 90 minutes from Bregenz by direct train and serves two functions for travelers moving through western Austria: it is the most likely international arrival airport for anyone visiting Vorarlberg, and it is the natural day trip or extension destination from the Lake Constance and Rhine valley zone.