I had a random ping increase of about 80ms starting around 2 hours ago. This seems to be an issue with only AT&T ISPs, my friends with AT&T (all East Coast) have ran into the same issues. It's very similar to what happened in Clash. Just wanted to acknowledge this ping increase to hopefully get it fixed faster
Edit 1: For people wondering, the last time this issue occurred it was an issue with server routing (Riot's side)
Edit 2: It seems that the issue has been resolved. Thanks Riot!