Want cheaper flights? Google says this is the best time to book one

TL;DR Google says domestic flights have historically been cheapest around 39 days before departure, while international fares hit their lowest around 89 days out. The idea that Tuesday is the best day to book is largely a myth, with the cheapest booking day saving only about 1.4% versus the most expensive. Changing when and how you fly matters more: weekday travel can save up to 20% domestically, while nonstop flights cost around 20% more than connecting options.