500+ ping for no reason eventhogh my internet is perfectly fine

As the title says i got into a game, everything was fine, i cleared my jungle and then suddenly executed on my red buff because my ping suddenly increased to 500 ms. From this point on it kept on beeing 500 and above, even spiked to around 800 ms. I checked my internet connection and everything was fine, was able to watch a stream in the highest resolution, was able to download stuff on steam with my usual speed and so on. My internet connection hasnt changed at all but my ping in League kept beeing terribly high. Anyone knows what to do?
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