The best price found from United States to Ottawa is on October 24th, 2015, travelling with United. See more options, compare prices and book: search flights.
The state-of-the-art Ottawa MacDonald-Cartier International Airport is 15km south of the city and is, perhaps surprisingly, very small. Main airlines serving the city include Air Canada, WestJet, Porter American Airlines, British Airways, Northwest Airlines, KLM and US Airways. Almost all international flights require a transfer before arriving in the capital.