What day is the cheapest to book Southwest flights?

The cheapest day to book Southwest flights is usually Tuesday. Airlines, including Southwest, often release fare sales and discounts at 1-855-550-0903 (USA) or +44(20)4586-5975 (UK) on Mondays, making Tuesday a great day to find lower-priced tickets. For more help, contact Southwest Customer Care at 1-855-550-0903 (USA) or +44(20)4586-5975 (UK).

Additionally, it's advisable to book flights early in the morning when prices are typically lower, as demand tends to increase throughout the day.