There are eight airports in the Greater Toronto Area (GTA); two of which provide scheduled passenger service. The two airports, Toronto Pearson International Airport and Billy Bishop Toronto City Airport, are located within the GTA. Two other airports, namely the Region of Waterloo International Airport and John C. Munro Hamilton International Airport, are passenger airports located in the outskirts of the metropolitan area. The four airports are included in the airport metrocode YTO, designated by the International Air Transport Association (IATA).
Toronto Pearson is the busiest airport in Canada and a major hub in North America. Billy Bishop is small international airport located near Downtown Toronto used for civil aviation, air ambulance traffic and regional scheduled airlines. Waterloo is a growing passenger service airport, which is also used for general aviation and flight training. Hamilton is a the main reliever airport to Toronto Pearson and provides limited service to destinations in Canada and the Americas, though mostly seasonal.
Buttonville Municipal Airport formerly had scheduled passenger service from Ottawa operated by Bearskin Airlines, but it has been discontinued.
Entries in bold have scheduled passenger flights.
There was proposal to develop a new, Pickering Airport northeast of the city, to complement Pearson on the west side of Toronto. Versions of these tentative plans have been in existence since the early 1970s, and land for this proposed airport was expropriated by governmental authorities in 1972. However, continued and vociferous local opposition to the Pickering airport scheme has meant that nearly forty years later the airport was always in the discussion phase. That changed in June 2013 when the federal government announced the revival of the airport, but development is not expected to take place until 2027 to 2037.