What Makes Southwest Airline Flights So Popular? Timing is everything when booking Southwest flight tickets. The best time to book Southwest Airlines flights is typically 6–8 weeks in advance. Tuesday and Wednesday mornings often reveal new deals and promo fares. Watch out for Southwest’s flash sales to score cheap SWA flights to top destinations. Whether it's short-haul or cross-country Southwest flights, knowing when to buy saves you big money. https://www.airlinereservationwindow.com/southwest-flight-tickets/ #FlightDeals #WhenToBook #SouthwestTips