Rennes airport is located about 7 kilometers southwest of the city of Rennes. It operates flights to/from Paris Roissy - Charles de Gaulle, Lyon, Marseille and several destinations abroad (Ireland, Italy, Portugal, Spain, UK).
From Rennes airport, you can reach the city centre:
by bus: number 57, bus stop "République", 1.50 euros.
by taxi: the airport is about 10/15 minutes from the city centre, approximately 15 euros before 19:00, 25 euros after 19:00.