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Currently you are able to watch "It's Always Sunny in Philadelphia - Season 5" streaming on Disney Plus or buy it as download on Apple TV, Microsoft Store.
There are no options to watch It's Always Sunny in Philadelphia for free online today in Australia. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
The fifth season of It's Always Sunny in Philadelphia, premiered on FX on September 17, 2009. The season contains 12 episodes and concluded airing on December 10, 2009.