Streaming, rent, or buy It's Always Sunny in Philadelphia – Season 4:
Currently you are able to watch "It's Always Sunny in Philadelphia - Season 4" streaming on Hulu or buy it as download on Apple TV, Amazon Video, Fandango At Home, Microsoft Store.
There aren't any free streaming options for It's Always Sunny in Philadelphia right now. If you want know when it is streaming for free, click 'Free' in the filters above and hit the notification bell.