Travelling from most locations, it is best to book your flight to New York during the month of March for the best deal, although there are other times of the year which offer great deals as well.
On average, from most locations, when planning your trip to New York, try to book your flight in the region of 36 days in advance for the cheapest prices.
In general, booking your departure to New York for a Tuesday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
Generally, when visiting New York, morning flights represent the best value. midday flights are likely to have higher prices.