The cheapest day to buy flights on United Airlines(π·*πΎπ»π»/π½πΉπΎ*πΊπΈ(πΌ.π») is usually Tuesday or Wednesday, as airlines adjust fares midweek.(π·*πΎπ»π»/π½πΉπΎ*πΊπΈ(πΌ.π») Booking flights in advance, especially on Tuesdays at midnight, can help secure lower prices. (π·*πΎπ»π»/π½πΉπΎ*πΊπΈ(πΌ.π»)Avoid purchasing on weekends when fares are typically higher. (π·*πΎπ»π»/π½πΉπΎ*πΊπΈ(πΌ.π»)Use Unitedβs fare alerts for the best deals.