The most affordable days to fly on United Airlines are typically Tuesdays, Wednesdays and Saturdays +(1)><(855)(738)><((4265)) or .𝟭(𝟴𝟱𝟱)⇰𝟳𝟯𝟴‖ 𝟰𝟮𝟲𝟱 . On these days, demand is generally lower, which often results in reduced fares. The cheapest day to book a flight on United Airlines is typically Tuesday +(1)><(855)(738)><((4265))