Originally Posted by
guv1976
There are low-cost airlines that fly the trans-Atlantic routes -- some nonstop, some with connections. Play can fly you CDG-KEF-YHM for under $500 USD, including a checked bag.
If you must fly into YYZ, TP can fly you ORY-LIS-YYZ for under $600 USD, including a checked bag.
It all depends on whether you are willing to take a connection versus a nonstop, and how choosy you are about which airline to fly.
There are always cheaper options, but this is the Air Canada Forum so presumably people have reasons for wanting to fly AC as it is rarely the cheapest!