Question: When did the new season of flash start?
Disambiguated questions and answers: question: When did season 3 of The Flash start?
When did season 4 of The Flash start?
When does season 5 of The Flash start?
answer: October 4, 2016
October 10, 2017
October 9, 2018
Natural Questions answer: October 10 , 2017 (from the Wikipedia article "The Flash (2014 TV series)")