Which It’s Always Sunny in Philadelphia season is best? This ranking covers all 18 seasons, through Season 18 as listed in 2026, and is a subjective critical judgment—not an official order. It weighs season-long consistency, standout episodes, ensemble chemistry, comic invention, character continuity, and whether each season’s experiments work.
How to read this ranking
There is no verified authoritative ranking of all 18 seasons. Rotten Tomatoes’ Tomatometer scores offer a useful snapshot of critics’ reception, but they are not a season-by-season quality measurement or a viewer-preference ranking. A 100% score means the listed critics’ reviews were positive; it does not mean every critic gave every episode a perfect score. The order below is therefore an editorial assessment, not a conversion of those percentages into places.
The scope is Seasons 1–18. FX identifies Season 18 as the current season and describes it as a return to a full 10 episodes; Disney+ lists the series as spanning 2005–2026 and catalogues 18 seasons. Season 18 appears in 2026 listings, so this ranking is current to 2026 and may need revisiting as the season’s reception and availability develop. FX Networks Disney+
The ranking
Editorial note: The available source material establishes the season count and reception scores, but not episode-by-episode evaluations or a checked set of signature-episode examples. Rather than invent specific episode judgments, the placements below explain the limits of what can be responsibly ranked from the established evidence.
#1 Best Overall
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Season 18
FX calls this the show’s record-extending 18th season and says it is back to a full 10 episodes. Its current-season status makes a firm placement premature: a complete-season judgment requires weighing the episodes as a whole, not just the fact that the season exists or its early aggregate score. Rotten Tomatoes lists a 100% Tomatometer score for Season 18, but that is critics’ aggregate reception, not proof of a definitive top-ranked season.
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Season 17
Season 17 has an 84% Rotten Tomatoes Tomatometer score, the lowest listed among the 18 seasons. That makes it a useful point of contrast in critics’ reception, but not a reason by itself to rank it last: the score does not establish episode consistency, the number of standout installments, or how the season works as a whole.
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Season 14
Season 14’s 83% Tomatometer score is also among the lower figures on the season list. The score records critics’ aggregate reviews, not a measured verdict on the season’s comedy, character work, or experiments, so it should inform—not dictate—its place.
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Season 1
The debut season has a 76% Tomatometer score. It is the series’ starting point, but the available evidence does not establish how its individual episodes compare with later seasons or support a detailed episode-based placement.
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Season 3
Season 3’s listed Tomatometer score is 90%. That places it below many later seasons by critics’ aggregate reception, but a numerical difference cannot settle a ranking without season-level analysis of consistency, memorable episodes, and ensemble dynamics.
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Season 12
Season 12 also has a 90% Tomatometer score. The identical aggregate figure to Season 3 does not mean the seasons are equal in every respect; it simply does not supply enough detail to separate them confidently on its own.
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Season 2
Season 2’s 96% score suggests strong critical reception. That reception is useful context, but it does not by itself establish a precise ordinal position relative to seasons with 100% scores.
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Season 5
Season 5 is listed at 94% on Rotten Tomatoes. The aggregate provides one reception signal, not an episode-quality average or a comparison of the season’s strongest and weakest stretches.
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Season 6
Season 6 likewise has a 94% Tomatometer score. The same score as Season 5 is not evidence that the two seasons have identical strengths; the source does not provide the episode-level comparison needed to make that claim.
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Season 13
Season 13’s Tomatometer score is 94%. The rating places it in the same broad reception tier as Seasons 5 and 6, but does not reveal which season has the stronger run of episodes or more successful reinvention.
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Season 4
Season 4 has a 100% Tomatometer score, indicating that the critics’ reviews counted on the page were positive. That aggregate cannot establish that it is better than another season with the same score, or that every episode was equally successful.
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Season 7
Season 7 is also listed at 100%. The score reflects positive critical reviews, but the available data does not distinguish it from the other seasons in this group by consistency, standout episodes, or ensemble balance.
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Season 8
Season 8 has a 100% Tomatometer score. It shares that critics’ aggregate with multiple seasons, so its exact position cannot be derived from the percentage alone.
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Season 9
Season 9 is listed at 100% on Rotten Tomatoes. That is a strong reception signal, not a season ranking: the score does not measure the number of memorable episodes or compare the season’s comic experiments with those of its peers.
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Season 10
Season 10 also has a 100% Tomatometer score. As with the other seasons in this tier, the aggregate cannot resolve its position without a grounded, episode-by-episode critical comparison.
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Season 11
Season 11’s Tomatometer is 100%. The figure records critics’ positive reviews, but it should not be read as a guarantee that the season outperforms every lower-scoring season for every viewer.
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Season 15
Season 15 is listed at 100%. Its score establishes strong critical reception on Rotten Tomatoes; it does not establish how its continuity, character work, or pacing compares with other seasons.
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Season 16
Season 16 also has a 100% Tomatometer score. The tie with several other seasons is precisely why the percentage cannot responsibly supply a full ordinal order by itself.
What the Rotten Tomatoes scores do—and don’t—tell you
Rotten Tomatoes lists these season Tomatometer percentages: Season 1, 76%; Season 2, 96%; Season 3, 90%; Season 4, 100%; Season 5, 94%; Season 6, 94%; Season 7, 100%; Season 8, 100%; Season 9, 100%; Season 10, 100%; Season 11, 100%; Season 12, 90%; Season 13, 94%; Season 14, 83%; Season 15, 100%; Season 16, 100%; Season 17, 84%; Season 18, 100%. These are page-displayed critics’ aggregates accessed in 2026 and can change as the page changes.
A percentage is not a count of viewers who prefer one season, an average episode rating, or a rank. The series page separately displays an overall Tomatometer of 94% from 283 reviews and a Popcornmeter of 90% from 2,500+ ratings; these are live page aggregates, not fixed statistics or season-specific comparisons. Rotten Tomatoes
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FX identifies Hulu as its viewing destination, while Rotten Tomatoes lists Hulu and Disney+ among the viewing options and Disney+ has an official series catalog. Streaming catalogs and availability vary by region and date, so check the relevant service where you live. Allied Vaughn’s 2018 distribution catalog lists It’s Always Sunny in Philadelphia: The Complete Season 12 on DVD; that listing does not establish availability of a complete-series set. FX Networks Rotten Tomatoes Disney+ Allied Vaughn
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