From Paris :
TGV Paris / Montbard : 1h00
Semur en Auxois is 15 minutes by car from Montbard station.
Or 35 minutes by TER bus, with TGV connections
From the multi-service platform in Montbard, Semur is also connected by TGV to Marne-la-Vallée, Roissy-Charles de Gaulle, Lille Europe, London by Eurostar and Brussels by Thalys.