There’s no shortage of theories out there on when the deals are best: Tuesdays, always Tuesdays because the sales go up on Mondays. No, Monday is best but it has to be at some off-peak time like 4:00 a.m. Also, don’t search too many times from the same computer because they (they as in the powers that control flight prices, whoever that technically is) will know you really want it and you’ll never see the deal. So what’s really true?