The most common destination for travelers is Toronto Pearson International Airport (Toronto International Airport). How you get from there to Toronto depends on your comfort level and budget. An affordable option is to take the #192 Airport Rocket or #58A Malton bus, which depart from the airport terminals at least every half hour. These buses can take you to Kipling Station and Lawrence West Station, respectively.
Literally, you can reach your destination in about an hour and a half. The journey will cost you 3 CAD, which includes the subway fare. Alternatively, you can opt for suburban buses, but they will cost you 4 CAD, excluding the subway fare.
If you have a reservation at a major hotel, consider taking the Pacific Western Airport Express bus. It also departs from the terminals every half hour and makes stops at major hotels in the city. It also stops at the Bay St. bus station and the Union Station Coach Terminal. A one-way trip on this bus costs 20 CAD, while a round trip costs 33 CAD. If you prefer a cab from the airport to the city, it will cost you approximately 60-70 CAD.
For those arriving at Bishop Airport, there's the option to take a ferry that departs every quarter hour.