There is no single best way of finding cheap international flights. As with any other purchase out there, you need to plan ahead and shop around to land the best deals—by altering your travel dates, trying different booking sites, or simply waiting until it is the right to purchase. However, if you are not in a hurry, you can save big on your next international flight by booking early.
Essentially, making late reservations during peak travel periods can cost a lot of money. International airfare prices typically go up in the last two weeks of the peak travel season. Accordingly, if you are planning ahead, strive to make the call prior to this deadline. If you are travelling internationally and want to get the best deals, it is highly recommended to book even earlier—from 3 to 6 months in advance.