What is the best time of year to get cheap flights to canada?

Any advise on when the flight companies reduce their air fares...Is there a particularly time of year when flights are known to be cheaperWhat is the best time of year to get cheap flights to canada?
Basically fares are cheaper when demand is down, and people tend to travel less during the cold winter months to other cold weather destinations. The winter and early spring months are probably the cheapest times of the year for flights to Canada, other than holidays.