The writers are said to be working on a 20-episode final season for Supergirl which will be airing in the new year.
Express.co.uk has approached The CW for comment on this story.
This year also marks the end of some other CW vetern shows including The 100, which is hoping to be returning with the prequel series.
Also, Supernatural will be ending a mammoth run on screens with season 15, which saw filming pushed back due to the coronavirus pandemic.
Supergirl season 6 will premiere on The CW in 2021