Travelling from most locations, it is best to book your flight to Madrid during the month of January 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 Madrid, try to book your flight in the region of 60 days in advance for the cheapest prices.
From most locations, the cheapest flights to Madrid are found on a Tuesday. Booking a Friday departure is usually the most expensive.
On average you can find the best deals on plane tickets to Madrid when looking for flights with evening departure times.