The Flash (season 4) Home media cover Starring Grant Gustin Candice Patton Danielle Panabaker Carlos Valdes Keiynan Lonsdale Neil Sandilands Tom Cavanagh Jesse L. Martin Country of origin United States No. of episodes 23 Release Original network The CW Original release October 10, 2017 (2017 - 10 - 10) -- May 22, 2018 (2018 - 05 - 22) Season chronology ← Previous Season 3 List of The Flash episodes
number of episodes in the flash season 4
23