<P> The fourth season began airing on October 10 , 2017 , on The CW . </P>
<P> The fourth season began airing on October 10 , 2017 , on The CW . </P>
the flash season 4 episode 1 when does it come out
the flash season 4 episode 1 when does it come out
October 10 , 2017
October 10 , 2017