What is the cheapest day to fly on JetBlue? The cheapest days to fly on JetBlue Airways flights are typically Tuesday, Wednesday, and Saturdays １Ｘ８４４Ｘ３２２Ｘ８０２０. These are considered off-peak travel days when demand is lower, leading to cheaper fares. What days are JetBlue cheapest to book? The cheapest day to book a flight on ???????????????????????????? ???????????????????????????????? Lines is usually Tuesday【[???? １Ｘ８４４Ｘ３２２Ｘ８０２０], as ???????????????????????????????? release discounted fares on Monday nights, leading to competitive price .