[WestJet] Westjet Canadian cities to Paris summer flights $550-$690 RT
I didn't see any open jaw tickets at the same price, but depending on your itinerary you may want to try.
These are on Econo fares so $25 baggage fee applies, plus seat selection fee if you want to reserve your seat.
These flights are normally $1000+ and it's rare to see summer dates at these prices.
Fly from many Canadian cities to Paris, France from only $516 CAD roundtrip.
Or fly during the summer from $539 CAD roundtrip.
Toronto: $516 (summer for $568)
Ottawa: $516 (summer for $539)
Vancouver: $566 (summer for $616)
Availability from June to October 2018