It does not work at all when used by itself or in conjunction with flairs no matter how much you bank away from an incoming missile from the rear or head on.
Also assuming that you are trying to avoid radar missiles, dont bother using flares, they do not affect radar missiles.
Chaffing does not work at all against SARH missiles when dodging missiles like it’s suppose to unless it’s a missile lock is coming from behind.
It can affect, but depends on situation
And In this video we can see you used flares instead of chaffs. I assume it’s just the replay bug ;)
I used chaff.