No. Title Air date Rating / share (18 -- 49) Viewers (millions) DVR (18 -- 49) DVR viewers (millions) Total (18 -- 49) Total viewers (millions) "The Flash Reborn '' October 10, 2017 1.1 / 4 2.84 0.7 1.92 1.8 4.77 "Mixed Signals '' October 17, 2017 0.9 / 4 2.54 0.8 1.82 1.7 4.36 "Luck Be a Lady '' October 24, 2017 1.0 / 4 2.62 0.8 1.84 1.8 4.46 "Elongated Journey Into Night '' October 31, 2017 0.7 / 3 1.99 0.7 1.79 1.4 3.79 5 "Girls Night Out '' November 7, 2017 0.9 / 4 2.38 0.8 1.84 1.7 4.22 6 "When Harry Met Harry... '' November 14, 2017 1.0 / 4 2.46 0.7 1.83 1.7 4.29 7 "Therefore I Am '' November 21, 2017 0.8 / 3 2.20 0.8 2.08 1.6 4.28 8 "Crisis on Earth - X, Part 3 '' November 28, 2017 1.0 / 4 2.82 0.7 1.83 1.7 4.64 9 "Do n't Run '' December 5, 2017 0.8 / 3 2.22 0.6 1.45 1.4 3.67 10 "The Trial of The Flash '' January 16, 2018 0.8 / 3 2.51 0.7 1.55 1.5 4.06 11 "The Elongated Knight Rises '' January 23, 2018 0.7 / 3 2.12 0.7 1.69 1.4 3.81 12 "Honey, I Shrunk Team Flash '' January 30, 2018 0.9 / 3 2.60 0.8 1.84 1.7 4.43 13 "True Colors '' February 6, 2018 0.8 / 3 2.28 0.9 2.00 1.7 4.28 14 "Subject 9 '' February 27, 2018 0.7 / 3 2.12 0.8 1.86 1.5 3.98 15 "Enter Flashtime '' March 6, 2018 0.7 / 3 2.04 0.8 1.83 1.5 3.87 16 "Run, Iris, Run '' March 13, 2018 0.7 / 3 2.09 0.7 1.58 1.4 3.67 17 "Null and Annoyed '' April 10, 2018 0.6 / 2 1.82 0.7 1.64 1.3 3.47 18 "Lose Yourself '' April 17, 2018 0.7 / 3 1.88 0.6 1.54 1.3 3.43 19 "Fury Rogue '' April 24, 2018 0.6 / 2 1.90 0.7 1.61 1.3 3.51 20 "Therefore She Is '' May 1, 2018 0.6 / 2 1.70 0.8 1.62 1.4 3.31 21 "Harry and the Harrisons '' May 8, 2018 0.7 / 3 1.74 0.6 1.52 1.3 3.26 22 "Think Fast '' May 15, 2018 0.7 / 3 1.93 TBD TBD TBD TBD 23 "We Are the Flash '' May 22, 2018 0.8 / 4 2.16 TBD TBD TBD TBD
the flash season 4 episode 19 release date
April 24, 2018