Pearson Airport is operating Today however they have issued a warning to travellers this morning of possible delays and cancellations due to the weather. They have posted the following warnings to their website and also their twitter feed.
April 15, 2018: Toronto Pearson continues to be affected by prolonged periods of freezing rain and ice pellets
Please be prepared for significant delays and possible cancellations. Airport operations will be very slow today as result of the weather. The airlines are working hard to deliver bags, but outdoor conditions are very difficult and the safety of workers is a priority. For passengers travelling today, arrive early for your flight. Drive safely or use public transit, if possible.
Freezing rain continues to affect the region. We're working closely with airlines to maintain operations and keep workers outside safe. Please check your flight status w. your airline or at https://t.co/3zG1zUt4eN. Arrive early and take public transit, if possible. Stay safe! https://t.co/CymIZbZE8j
— Toronto Pearson (@TorontoPearson) April 15, 2018
The other airports have advised checking with your airline or viewing the arrival departure websites available in links below.
If you are flying today it is advised you check ahead for cancellations or possible delays;
Pearson Airport you can check torontopearson.com
Hamilton Airport can be found at flyhamilton.ca
London Airport is found at flylondon.ca