Travelling from most locations, it is best to book your flight to Cairns during the month of February for the best deal, although there are other times of the year which offer great deals as well.
In general, booking your departure to Cairns for a Tuesday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
Typically, cheap prices to Cairns are most often found for midday flights. Cheap prices are less likely for afternoon flights.