Travel Southwest’s three-day sale ends Thursday: What you need to know to score cheap tickets June 4, 2019June 6, 2019Dawn Gilbertson, USA TODAYComments Off on Southwest’s three-day sale ends Thursday: What you need to know to score cheap tickets Southwest's three-day fare sale, held twice a year, ends Thursday. Act now to snag $49, $79, $99 and $129 for late summer and fall travel.