Route to Pearson International Airport (click for larger view)
Surprisingly, the drive to or from Pearson can be done in as little as 25 minutes, depending on the time of day. Even in rush hour it is at most an hour. The 427/Gardiner combination is speedy, and off the Lakeshore a quick run up Woodbine takes you almost all the way there.
A flat-rate taxi to or from the airport is about $75 including tip. The cheaper way is by TTC, which takes 1.5 hours but only costs one token.