Travel and Parking
Waterloo, ON is a little over 100km from Toronto. See Directions to Waterloo from the University of Waterloo's webpage.
Government of Canada travel to Canada guidelines and checklists available here.
Nearby Airports
The closest major international airport to Waterloo is Pearson International Airport (YYZ) in Toronto, ON. There is a small regional airport (YKF) at Waterloo with some national flights. There are also smaller airports in downtown Toronto (YTZ) and in Hamilton (YHM).
Airport shuttle services
Waterloo taxi: you can book a taxi ahead of time to pick you up at Pearson International Airport to go to Waterloo, and from Waterloo to Pearson International Airport. We recommend this service.
Uber (costs can vary).
Trains
From downtown Toronto there are a couple of trains with limited schedule and very few trains per day.
Commuter rail: https://www.gotransit.com/en/
National rail: https://www.viarail.ca/en
Reimbursements
For those receiving funding, you will be reimbursed by the Combinatorics and Optimization Department at the University of Waterloo. When purchasing your ticket it should be "lowest logical fare/rate is the lowest class that includes travel-appropriate features such as:
Advanced seat selection
Trip cancellation insurance
Refundable/changeable ticket status if there is question about whether the trip will occur or the dates of travel (a small fee may apply)
One checked bag"
Parking
The closets parking lots are Lot M or Lot N. Lot M is CAD $6/day and Lot N is CAD $5. M is closer but N is cheaper. If everything is full, then lot X is almost always available (and farther away). These lots are all pay and display (and take Canadian coins or Visa or Mastercard).
https://uwaterloo.ca/parking/about/rates-parking
https://uwaterloo.ca/parking/about/our-parking-lots
https://uwaterloo.ca/parking/about/campus-map