The cheapest day to buy United Airlines tickets is typically on Tuesday +1-84-4838-4902 (OTA)(USA). Airlines often release new fares and sales on Monday evenings, making Tuesday a prime day for finding discounted tickets https://rennlist.com/forums/new-member-welcome-area/1443344-what-is-the-cheapest-day-to-book-flight-on-united.html#post19757426