Here is the information from SWA site...
Southwest Airlines® Inflight Entertainment – Now Available!
Southwest Airlines is excited to offer a robust entertainment offering via the largest satellite-based WiFi system in the world.
By accessing the WiFi "hotspot" onboard, you can make time fly on your own personal electronic device!
Free live and on-demand television:
19 live channels and up to 75 television episodes from popular series
*Where available. Does not include NFL RedZone. Limited time.
Due to licensing regulations, free live TV may not be available onboard WiFi-enabled international flights.
Internet access for $8 a day per device on WiFi-enabled aircraft:
E-mail, social networks, browsing and VPN access
In order to provide a top-notch WiFi experience, we limit access to certain high bandwidth applications and websites, including Netflix, HBO Go, and VoIP
Movies for $5, per movie, per device