Calgary to Paris, France has also dropped to $745 CAD roundtrip including taxes for summer travel (late July, August) with KLM and Air France.
Other dates throughout 2017 are also available, but the July/August dates are the most notable. The airlines generally don't like to drop their July/August prices to Europe too much below $1100.
http://yycdeals.com/calgary-to-paris...ncluding-taxes