For those wondering "What terminal is Southwest Airlines in Denver Airport?", Southwest flights depart from Jeppesen Terminal, Concourse C at Denver International Airport (DEN). Passengers must check in at the main terminal, clear security, and then take the underground tram to Concourse C. Plan extra time for security lines and terminal transfers. https://www.airlineticketsoffice.com/blog/what-terminal-is-southwest-airlines-in-denver-airport/