Low Fares Return on Southwest

“The sale launched Tuesday morning and is good for travel from Aug. 22 through Dec. 13. Flights on Fridays and Sundays are excluded from the sale as are certain dates around the Labor Day and Thanksgiving holidays”

https://www.usatoday.com/story/travel/flights/todayinthesky/2017/06/06/72-hour-sale-southwest-fares-fall-below-100-round-trip/102542150/