MSP HHH to Las Vegas was perfect - departing and arriving on time. The return flight that was scheduled to arrive at MPLS at 1:00 PM on January 28th; however it 12 hours late arriving at 1:00 AM on the 29th. Fortunately I have family to spend time with away from the airport - some passengers were at the airport 14 hours! I initially arrived at the airport at 6 AM to check my luggage and then returned again 4 hours before actual departure - because it wasn't certain when the plane would arrive from MPLS to unload/reload. What made the passengers most angry and frustrated was the fact there were no SunCountry agents at the desk. The delays were not posted on the electronic posting so no one had a clue what was going on. One passenger finally called Minneapolis Reservations and requested that an agent come to the desk in Las Vegas and update passengers as to what was going on - this didn't happen until 1 hour prior to boarding. Positive side: Attendants were wonderful; food was hot generous and appreciated.