The best time to buy Southwest Airlines tickets is typically on Tuesday afternoons, around 3 PM ET, when their Click ‘N Save fare sales usually go live after Monday evening releases. Booking midweek—Tuesdays, Wednesdays, and Saturdays—also tends to yield lower fares, thanks to reduced travel demand and fare-matching by competitors. For optimal pricing, book 1–3 months in advance, monitor the Southwest Low Fare Calendar, and set up fare alerts to catch the best deals.