<Tr> <Td_colspan="2"> ← Previous Season 12 </Td> </Tr> <Tr> <Td_colspan="2"> List of It's Always Sunny in Philadelphia episodes </Td> </Tr> <P> The thirteenth season of the American comedy television series It's Always Sunny in Philadelphia premiered on FXX on September 5, 2018 . </P> <Ul> <Li> Charlie Day as Charlie Kelly </Li> <Li> Glenn Howerton as Dennis Reynolds </Li> <Li> Rob McElhenney as Mac </Li> <Li> Kaitlin Olson as Dee Reynolds </Li> <Li> Danny DeVito as Frank Reynolds </Li> </Ul>

When does it's always sunny in philadelphia season 13 start