KLM has some pretty crazy deals going on from Toronto
Limited January to February dates available but perhaps check other months as well. I was able to find February 9th-17th from $538 roundtrip taxes in. This flight is actually on Air France via Paris. 1st checked bag is free as well.
(note there are sales to other destinations as well. For example YYZ-Mumbai, India --- $498 CAD roundtrip inc/taxes)
These are bookable through expedia.ca