Ratings The season premiere was watched by 3.17 million people and had a 1.3 demo rating, slightly down from the second-season premiere and on par with its second-season finale.
The Flash crossover episode, "Invasion!", saw a season three-high viewership of 4.15 million viewers, which was the show's largest since December 9, 2014, and a season three-high 18–49 rating, the highest since February 16, 2016. The third season finished as the 120th ranked show, with an average viewership of 3.50 million. In Canada, the season was the 9th most-watched series in the 18–49 demographic, 8th among adults 18–34, and 14th among adults 25–54 of the
2016–17 television season. In 2016, according to an analysis from Parrot Analytics, which used ratings data (where available), peer-to-peer sharing, social media chatter, and other factors to estimate viewer demand for various shows,
The Flash was the 5th most popular show in the world, with 3.1 million demand expressions per day, behind
Game of Thrones,
The Walking Dead,
Pretty Little Liars, and
Westworld. From January to July 2017,
The Flash was the 7th most popular show in the world, with 5.47 million demand expressions per day. Parrot Analytics also noted that the popularity of the show did not slow down during the summer 2017 off-season, saying "It's consistently popular, similar to
Game of Thrones, and it appears to be growing in popularity."
Critical response The
review aggregator website
Rotten Tomatoes reported an 85% approval rating with an average rating of 7.14/10 based on 272 reviews. The website's consensus reads, "Taking its most compelling and emotionally resonant turn to date,
The Flash shifts focus in its third season, turning from the grandiose and bizarre toward the characters who inhabit its core universe -- all while remaining action-packed, funny, and dramatic."
Metacritic, which uses a weighted average, assigned a score of 80 out of 100 based on 4 critics, indicating "generally favorable" reviews. Jesse Schedeen of
IGN rated the season 7.8 out of 10, saying, "
The Flash met plenty of speed bumps in Season 3, but a strong finish helped the series persevere in the end."
Collider Carla Day lauded the season finale, rating it four stars out of five, but gave the entire season a rating of three stars. J.C. Maçek III of
PopMatters rated the season 7 out of 10, saying, "When the show stumbles, the overarching story arc of the season keeps things going and keeps us interested [...] The show remains interesting and fun enough -- without being too lightweight -- to sustain another season and another cliffhanger."
Accolades The Flash was ranked 8th on
The Salt Lake Tribune Top TV Shows of 2016 list.
Comic Book Resources named "Flashpoint" and "Invasion!" as the 7th and 16th, respectively, best episodes in 2016 among comic book-related television series.
SyfyWire named the season premiere, "Flashpoint" one of the best television episodes of 2016. == Notes ==