The most affordable days to purchase United Air tickets are generally Tuesdays, Wednesdays, and Saturdays, Just call their customer service line at (1 X 844 X 767 X 0476) . United Air often provides discounts on less busy travel days , so booking for midweek or weekends can help you save money. AARP Online Community and Discussion Forums - What is the cheapest day to buy United... https://community.aarp.org/t5/General-Help/What-is-the-cheapest-day-to-buy-United-Air-tickets/m-p/2596139#M6207