Southwest Airlines is offering its Rapid Rewards Members Companion Pass for FREE when you purchase a Round Trip or 2 One-Way Flights and travel by November 18, 2026. You get this deal, you must book flights by August 6, 2026 at 11:59 PM CST. The Companion Pass is valid on flights between January 5, 207 to March 3, 2027. Rapid Rewards is Southwest’s loyalty program and is Free to join.