Map

How to reach Quimper:

- by plane to Quimper airport (Pluguffan) from Orly Airport   OR  to Nantes airport from Roissy-CDG (you can then take a bus to the train station SNCF and reach Quimper)
- by train to Quimper from CDG Airport

(type in aéroport Paris-roissy-charles de gaulle)

http://uk.voyages-sncf.com/en/

- by train from Montparnasse station:

you can take a bus Air France from the airport to the train station

http://en.lescarsairfrance.com/lignes-horaires/ligne-cdg-aeroport-paris-gare-montparnasse.html
it's about 1 hour 15 minutes (but without traffic!!)

or you can take the metro RER B  then metro 4
http://www.ratp.fr/itineraires/en/ratp/resultat-detaille/start/Aeroport+Charles+De+Gaulle+2+Tgv+%28RER%29%2C+Le+Mesnil-Amelot/end/Gare+Montparnasse+%28SNCF%29%2C+Paris/is_date_start/1/date/2015-04-07/time/15%3A35%3A00/route_type/plus_rapide

and catch the train at Montparnasse 
http://www.voyages-sncf.com/billet-train/resultat?hid=JBN#journey_1

- by bus from Paris Bercy

http://fr.ouibus.com/fr/map?departure=421449&gclid=CjwKEAiAws20BRCs-P-ssLbSlg4SJABbVcDpENYajmVl0mVwqh7Tz9QKiqxeIJV-wy0I4eFN_0oiBhoCK6nw_wcB

Then catch Aeroport Paris-Charles de RER, Stop at Paris Chatelet/Les Halles

Then catch Paris Lyon RER