So much blatant misinformation in here.
The
15 runs on campus, not the 18. The 15 runs
to campus on Sundays, but not
from.
If you want to get to Burlington GO, you can go to the Hamilton GO Centre and take the 18 (Aldershot). Better yet, if you don't feel like going to the GO Centre, get across the highway to Dundurn & King and wait there. There are plenty of stops for the GO buses along King. Get off to Aldershot (final stop) and board the train. Get off at the next stop (Burlington)-- they announce every stop.
As for timings, it's every hour on the weekend.
Here is the schedule.
Fare is $4.80 for a one-way adult ticket.
And yes, you can beat the system and pay nothing. It's probably not worth the 5 bucks, unless you feel like wasting a bunch of time for it.
Guaranteed I'm too late for this to be of any use.