Passengers seeking cheap flights on United Airlines can get discounted deals and offers from the airline, but there are some strategies to do so. Travelers can get cheap flights booked on United by signing up for the airline's newsletter, which helps them get regular updates on flash deals and offers. It is suggested to book flights on Tuesday and Wednesday, as these are known Best Days to Book Flights on United Airlines. For more detailed information, one can request help from the United customer service or read the blog on the Airlines Group Travel website.