Usually, the more you get to the back, the more expensive the ticket is.
This is because airlines usually adopt dynamic pricing strategies to adjust ticket prices in real time according to market demand and supply. When the departure date of a flight is near, the airline will gradually reduce the discount rate of the ticket to ensure that the seats of the flight are sold as much as possible. This also means that the price of air tickets tends to get higher and higher in the period closer to the departure date.
Of course, there are some exceptions. For example, if an airline has unsold seats on a flight, they may reduce the ticket price in the last few days or hours before departure to attract more passengers to buy tickets. In addition, if the travel season of a destination is low, the airline may also reduce the ticket price a few weeks or months before the departure date to attract more passengers to the destination.
To sum up, although in some cases the air ticket will be cheaper as it gets later, in general, the price of the air ticket will gradually increase as the departure date approaches.