The eighteenth season of the American television sitcom series It's Always Sunny in Philadelphia premiered simultaneously on FXX and FX on August 17, 2026, consisting of ten episodes. The season stars Charlie Day, Glenn Howerton, Rob McElhenney, Kaitlin Olson, and Danny DeVito as "the Gang". Episodes have next day availability on the FXNOW website and Hulu.
Cast
Main cast
Charlie Day as Charlie Kelly Glenn Howerton as Dennis Reynolds Rob McElhenney as Ronald "Mac" McDonald Kaitlin Olson as Deandra "Dee" Reynolds Danny DeVito as Frank Reynolds Recurring cast Mary Elizabeth Ellis as The Waitress Sandy Martin as Mrs. Mac Andrew Friedman as Uncle Jack David Hornsby as Cricket
Guest cast Carol Kane as Samantha Artemis Pebdani as Artemis Mary Lynn Rajskub as Gail the Snail Gregory Scott Cummins as Luther / Donald Nate Corddry as Mortician Sam Song Li as Jie Elaine Kao as Professor Lee Nick Kroll as Kevin Guillermo del Toro as Pappy McPoyle Jimmi Simpson as Liam McPoyle Nate Mooney as Ryan McPoyle Tyler Tomás Perez as Darren Dan Ahdoot as Mitch John Ales as Philip
Production
Development After the fourteenth season aired, It's Always Sunny in Philadelphia was renewed for four additional seasons in December 2020, intending to take it up to season 18. The season comprises ten episodes, making it the first ten-episode season since season 14 in 2019.
Filming Filming for the eighteenth season began in February 2026 and completed in April 2026.
Episodes
Release The season premiered with two episodes on August 17, 2026.
Reception On Rotten Tomatoes, the season has an approval rating of 100% based on 9 reviews with an average score of 7.3/10.
Notes
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