You may be looking for the cheapest flight when booking one. Google says midweek flights are cheaper than weekends.
Monday-Wednesday flights are 12-20% cheaper than weekend flights. Google says Sundays are expensive to fly.
If you don't mind the extra time, booking a layover flight can save you about 20%.
If you buy flights Tuesday through Thursday instead of the weekend, prices are only 1.9% cheaper on average over the past five years, according to the search engine giant.
To avoid price increases, book your flight far in advance. Google says domestic flight prices are lowest 21 to 60 days before departure.
Google says domestic trip prices are lowest between 23 and 59 days before departure, and lowest at 38 days out.