Flight prices tend to drop When there is less demand, such as during low seasons, or when booking well in advance, ideally between 4 and 6 weeks in advance for domestic flights and 1 to 4 months in advance for international flights.

https://sites.google.com/view/alaska-airlines-mexico/home
https://sites.google.com/view/tap-portugal-es-pt/home
https://sites.google.com/view/qatar-airways-es-es/home