Flights from Toronto to Beijing and Shanghai, China just experienced a 25-30% price drop below their usual bottom price.

Toronto to China flight deals.
Toronto to China flight deals.

These fares to China look to be available on a large variety of dates between September 2013 and March 2014.

Use to find the best availability:

Look for the flights on United with 1 stop each way in Chicago or Newark. The total travel time should be around 16-17 hours each way.