Air Canada is having a huge airfare sale to Buenos Aires!
Prices for flights from most major Canadian cities (Montreal, Toronto, Vancouver, Halifax) are as low as $511CAD roundtrip. This is a huge savings over the normal rates of well over U$S 1000.
You can book these special fares at airfare.com, but act now because they will not last. Unfortunately, flights from Buenos Aires to Canada are not discounted. 
And, if you or your guests need a place to stay, check out our Buenos Aires rental apartment.
– Thanks to The Points Guy for the tip.