Ottawa Macdonald-Cartier International Airport is located in southern part of Ottawa City Centre. The airport is one of the busiest ones in Canada, linking between the City to Montreal, Toronto and it is also the hub of flights to the eastern Arctic and Iqaluit. OC Transpo bus â€“ 97 is serving passengers to City Centre. Airport limos and shuttle buses are ... More>also available, and there are several rental car agencies located at the airport. Ottawa's O-Train is also serving there and city centre.