Give a stream of consciousness and then the final answer. The fourth season began airing on October 10, 2017, on The CW.

Answer this question: when does the flash season 4 start cw?
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To answer the above question, the relevant sentence is: The fourth season began airing on October 10, 2017, on The CW.
So, the final answer is October 10 , 2017.
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