By TGV from Paris Montparnasse. St Brieuc is on the TGV Ouest line between Paris and Brest. There are about 10 trains a day. In some cases you may need to change trains in Rennes. The train ride takes about 3 hours.
St Brieuc is on the N12 expressway about 1.5 hours from Rennes. Watch out for the speed cams on the bridges.
You can transit through Roscoff (2 hours by car to the West) or Saint-Malo 1.5 hours to the east. Brittany Ferries runs overnight car and passenger ferries from southern English ports of Portsmouth and Plymouth.
St Brieuc has a tiny airport. The only flights landing are those from the Channel Islands. It's a fast but expensive way of getting here. Ryan Air flies from London Stansted and East Midlands to Dinard Pleurtuit Airport which is about 1.5 hours to the East. Also from March 2008, Skybus will operate a service between St. Brieuc and Newquay Cornwall Airport, 4 days per week.
CYCLING IN AND AROUND SAINT-BRIEUC is great!
Fine panoramas, nature is beautiful along the coast as well as in the interior which is absolutely different: a paradise filled with flowers....
SARL V?los Centre is the place to rent bikes.
The address is: 14, rue Houvenagle Saint-Brieuc