According to Travel Pulse, January is the BEST month to book travel. The first month of the year is considered the "Wave Season" in terms of travel. Here's the reason January is the best month to book your trips:
Besides availability, new access to flights and greater opportunities to budget for travel throughout the year, Wave Season also offers some of the greatest deals of the year.
Flights for the summer are going to be cheaper to purchase during the winter months; book flights during the opposite season in order to get the best deals. One reason for why airfare is going to be cheaper the further out you book is because there’s generally less competition and demand for those flights. Once everyone starts searching for flights for their summer trips, usually in April or May, the prices will skyrocket.