Itâs Always Sunny in Philadelphia is already locked in for a 13 and 14 season at FXX, but there will be a very long wait until we get to see it. According to TVLine, season 13 of the show is not expected to debut until âlate 2018,â which means itâll be a year and a half wait for a new season since the last season wrapped up back in March. In the meantime, Kaitlin Olson is keeping busy with her recently renewed Fox series The Mick while Glenn Howerton is starring in an upcoming NBC comedy by Mike OâBrien, so even though itâs a while off until Always Sunny returns, weâll still see plenty of the gang on TV in the meantime.