overseas of local are all almost the same regardless when it comes to flights, they all use the same pricing system dynamic ones.

you get the cheapest when you book months and months ahead of time that's when the airlines sells at a discounted rate to fill a plane up a a certain % or breakeven. Once that threshold are met then those promo prices are usually gone and that's when the real profits starts to be for the airlines.

Maybe only special cases you get really cheap promo prices last min but I'm sure you the chances are low. Airlines uses shit loads of methods and the price of tickets are different on different time of the day, IP where the booking is done and also cookies to see if you have browsed before and etc