Southwest is celebrating 40 years with $40.00 one way flights. Fares do not include federal excise tax of $3.70 per takeoff and landing, airport-assessed passenger facility charges (PFC) of up to $9, and government-imposed September 11th Security Fee of up to $5 one-way. Purchase by June 23, 2011, 11:59 pm Pacific Time. Travel August 23 through November 16, 2011. Blackout View Post