The fourth season of It's Always Sunny in Philadelphia, premiered on FX on September 18, 2008. The season contains 13 episodes and concluded airing on November 20, 2008.
| Title | Season 4 |
|---|---|
| Genres | Comedy |
| Air Date | 2008-09-18 |
| Episode Runtime | 00 Hours 44 Minutes |
| Season Number | 4 |
| Episode Count On Season 4 | 13 |
| Production Companies | 3 Arts Entertainment, Bluebush Productions, FX Productions, RCG Productions |
