690 René-Lévesque blvd East, Québec, QC G1R 5A8
Use http://maps.google.ca/ to get directions from your location.
Quebec is 253 km from Montreal. It may be cheaper to fly to Pierre-Elliot-Trudeau International Airport in Montreal and either rent a car or take the train. The Dorval VIA train station is a short drive from the airport and a complimentary shuttle is provided. The train takes you directly to downtown Quebec. See VIA Rail Canada for more detail.
Jean-Lesage International Airport
Many airlines fly directly to Quebec City. The Jean-Lesage airport is a 20-min drive from downtown Quebec, where the Delta Quebec is located. See http://www.aeroportdequebec.com/vols/destinations-desservies/europe/ for more detail.