In general, when looking for the cheapest flight to Toronto, try to choose a flight departing in November for the best deal.
In general, most flyers find the cheapest time to book a flight to Toronto is about 57 days prior.
Most of our users find that booking their departure to Toronto on a Tuesday is the cheapest. Conversely, departing on a Sunday seems to be the most expensive.
On average you can find the best deals on plane tickets to Toronto when looking for flights with morning departure times.