I use a very reliable taxi service, Maple Leaf Taxi, for trips to the airport. I find that they are the most professional, with clean cars, good service etc, of all the taxi companies, and that it's not worth it to pay for a limo service. It's the taxi service my law firm used, and they used to transport exhausted sleepy lawyers to the suburbs in the middle of the night, and various packages, so I trust them. Their telephone number is 416 465 5555. You can ask for a flat fare.