On off peak days, such as weekdays or during non-holiday periods, you will find cheap flight tickets as there is less demand.
Different websites might have different deals, offers, discounts,etc. Keep track of the price for some days and book the flight ticket that you find to be the best value
Advance booking help you to take advantage of early bird discounts. On the other hand, booking at the last minute can sometimes result in cheaper prices.
By changing your location, you can take advantage of regional pricing and book tickets at cheaper rate for the same flight.
Many airlines offer discounted rates for students. In this way, you can save money and make your travel more affordable.