What's up with my ping?

Recently my ping has been going crazy. It shoots up to over 2-3k and one time it even went up to 17k!!! Worst part is it stays like that throughout the game. This is really pissing me off. =/ IF I'M LUCKY...then SOME GAMES it'll stay at 200 ping, which is not playable at all either. My usual ping is around 80-90. Now the weirdest part is that I also did a ping test on command prompt on the league NA servers and it shows my ping to be around 80-90 ms at the same time that my ping in game is showing 200+ ping. What's going on?
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