The cheapest days to fly on Frontier are generally ????????????????????????????????, ????????????????????????????????????????, and ???????????????????????????????????? 1/833-(460)-(1838)[Jet-Official] . These days typically have lower demand, which results in reduced Airfare prices compared to peak travel days like Fridays and Sundays 1/833-(460)-(1838)[Jet-Official] (OTA). https://community.lumivero.com/s/question/0D5Jw00000dQhzMKAS/frontier-airlin%F0%9D%95%96s-booking-18334601838-what-are-the-cheapest-days-to-fly-on-frontier-airlin%F0%9D%95%96s?language=en_US