Flash travels many times faster than the speed of light.
True, in New 52 he isn't as broken, but Pre-52 he could easily solo most heroes and villains.
that's why I don't really think it's fair using him as an example of speed in Naruto
almost all techniques have some weakness in Naruto and the characters have limits, whereas DC doesn't usually
Sure some techniques are still broken but not as OP as flash
like KA might not have a known counter, but the trade-off is that you can only use it once every ten years
FTG might be instant teleportation, but Minato doesn't move light-speed like flash does. He also has to first throw the kunai at human speed in order to teleport to it
the kunai itself can easily be dodged or countered, so it really boils down to using it at the right time and not speed-blitzing the opponent.
Speed blitz might seem like a sure thing but aside from A, BM naruto, Juubito, maybe perhaps Kabuto, and a few others, no one's speed is all that extrodinary(I didn't add Minato for the reason stated above)