Plan further ahead, typically 3 to 6 months before your trip. For Europe, the sweet spot is often around 129 days (roughly 4 months) out.
Discussion: how long in advance is the ideal to book flights? best time of month to buy airline tickets
Aim to book 1 to 3 months in advance. Data shows prices often hit their lowest point around 38 to 44 days before departure. Plan further ahead, typically 3 to 6 months before your trip
For peak periods like Thanksgiving or Christmas, start monitoring as early as August and try to book by mid-October or Halloween. The Best Day of the Week to Buy Plan further ahead