Showtime, I think? Legends of Tomorrow airs on like Friday on Much, and I think Arrow is on Saturdays on Much.
Flash is the only one the right night, I think these days. It's the only one I follow as it airs, I just download LoT after it airs. I gave up on Arrow. Flash is on CTV, but every once in awhile they preempt it for something else and Flash airs on "CTV2" instead. The 2 in CTV2 is the exact number of people that have access to that channel though.