https://supportcommunity.milestonesys.com/s/question/0D5bH00000ZDkV2SAL/know1-what-is-the-cheapest-day-to-book-a-flight-on-united-unitedcall?language=en_UShttps://supportcommunity.milestonesys.com/s/question/0D5bH00000ZDkV2SAL/know1-what-is-the-cheapest-day-to-book-a-flight-on-united-unitedcall?language=en_UShttps://supportcommunity.milestonesys.com/s/question/0D5bH00000ZDkV2SAL/know1-what-is-the-cheapest-day-to-book-a-flight-on-united-unitedcall?language=en_US