What is the cheapest day to buy flights on United Airlines? The cheapest day to book a United flight is typically ＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１)(USA)Tuesday or Wednesday, as airlines often release deals early in the week ([for more info＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１)[USA] or＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１)[USA]]) The best days to book cheap United flights are Wednesday,＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１Wednesdays, and Saturdays. Prices are lower on these days, ＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１, compared to weekends. Flying on United ＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１ Wednesday, Wednesdays, or Saturdays can also help you save money since these are usually off-peak travel days [reach out to:＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１) or＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１ [USA] or＋１ ｘ ８３３ ｘ ８４４ ｘ １２０１) (USA) '. For the best fares, book at least 3-6 weeks in advance and set fare alerts to track price drops.